Showing posts with label chess. Show all posts
Showing posts with label chess. Show all posts

Sunday, 26 May 2024

Science Fiction Nonsense

Never let it be said that Hollywood has any reservations about ignoring scientific facts at the expense of the storyline. In Netflix's "Atlas", a rogue AI humanoid robot flees Earth for ... wait for it ... a planet in the Andromeda galaxy. Now this galaxy is the closest major one to Earth but it is still about 2.5 million light years away. If the AI terrorist, as he's described, had fled to a moon of Jupiter or Saturn then there might be a degree of plausibility.

Instead a mission is launched from Earth to capture the robot and it reaches its faraway destination seemingly instantaneously. From then on it's a case of good AI versus bad AI. Interestingly the rogue AI envisages a future where most of humanity is wiped out and the few humans that remain will live in harmony with the natural world while their AI overlords look on benevolently.


This is precisely the plan of the global elite who aim to use AI, humanoid robots, killer drones and whatever to cull the human race and then rule benevolently over the humans that are left. The slaughterbots and killer drones will first replace the human police and military who might have qualms about culling their fellow humans. After that the cull will begin. 

The cull might be gradual and take the form of mandatory sterilisation or it might be quick and achieved via a bioengineered pathogen. Sooner or later however, the population of the planet will be reduced to around 500 million people, a manageable number especially with an enforced digital ID, smart city surveillance, social credit scores and non-human police to quash any malcontents.

What's also laughable in the movie is that the protagonist, Atlas (played by Jennifer Lopez), is playing chess with an AI in her home at the start of the movie. As she walks out the door, she finishes the game by announcing checkmate. Anyone who know anything about chess knows that the current computer chess engines easily crush the strongest human players in the world. Subsequently, the black queen chess piece plays an important role in the movie. Is this some sort of homage to the recent, famous movie titled "The Queen's Gambit".

Anyway, Jennifer Lopez who will shortly be turning 55, looks amazingly youthful but that doesn't do much to help the movie. It's inevitable that science fiction movies will focus on the use and misuse of AI but it can be done in a way that offers some credibility in the science department. Apart from AI, the other theme at the moment in science fiction movies is the multiverse which is also being done to death. There seems to be a decided lack of imagination and creativity when it comes to science fiction.

Thursday, 15 February 2024

My Maxim

 Once a day

But

Everyday

Ah, a fine maxim that I hope to apply to more of the activities that I tend to neglect. In my Mathematics post today I averred to subject the number associated with my diurnal age to the rules of Conway's Game of Life, once a day but everyday. I might usefully apply this maxim to the my dart throwing. I've already set up an Airtable database to keep track of my "efficiency" as I call it and which I explained in a blog post titled Measuring Dartsmanship. I should also apply it my chess puzzle solving that I wrote about in a blog titled Chess Puzzle in October of 2023. A puzzle solved each day is a sure way to improve my chess abilities or at least arrest their decline.

The maxim can also be applied to physical activities around the house. There are plenty of chores that need doing and it might be helpful to create a list of them so they could be attended to on a more regular basis. As it is, I tend to have bursts of sometimes intense activity followed by long periods of indolence. Getting back to intellectual matters, my failure to master the Indonesian language could be attributed in part to my failure to embrace this maxim. Again, I have bursts of activity followed by inactivity. I was thinking that watching at least one YouTube video each day about the language might be helpful.


Variations on a theme

The activity doesn't have to be the same each day. For example, if I didn't want to solve some chess puzzles then I could play a game of chess instead or study an opening. Similarly with the Indonesian language, there are many activities that could be tried other than watching videos. For instance, Desy was searching for the English word "fold" to describe the activity of folding clothes. I told her the correct word and didn't want to admit that I didn't know the equivalent Indonesian word. The word happens to be "lipat".

"tikar" means "mat"

For example, "Desy folded the clothes" would translate as "Desy melibat bajunya" and "followed clothes" would translate as "pakaian terlibat". There's a similar word "libat" that means "to wrap" and is used figuratively to mean to be involved with or wrapped up in something. For example, "She was involved with a married man "Dia terlibat dengan pria yang sudah menikah". There's even "lihat" that means "to see".

Sunday, 8 October 2023

Chess Puzzle

Wow, it's been a while since I last posted anything on this blog. In fact it was July 23rd of this year when I posted about a new image file format. Today I was presented with a chess puzzle that took me a few minutes to work out. See Figure 1.


Figure 1: White to move and mate in 2

The key to the problem is Black's lack of mobility. Only the rook or the pawn on a7 can move. White must make a move so that, whether Black moves the pawn or the rook, mate must follow. The necessary move is Qd5, obvious enough once you see it.

Recently I started solving some of the puzzles on lichess.org as an alternative to playing full games which I usually lose (playing on Fairy-Stockfish 14 level 6). See Figure 2. I always play classical chess with an unlimited time control as I don't enjoy the stress of timed games. I've tried playing 5 minute games against online opponents but found that too tense. I only play against the computer nowadays. For this reason I don't have a rating as it's only games played against online opponents under time controls that count.


Figure 2

My current level in solving puzzles is 1967 and in general I hover around the 2000 mark, sometimes a little above and sometimes a little below.

 
Figure 3

It's a relaxing alternative to playing full games and I should do it more frequently as one means of keeping my brain active.

Thursday, 2 February 2023

Indonesian Language Skills

 I made a post at the start of 2022 titled The Usual Suspects in which I wrote:

With the start of a new year, I usually try to kick start some projects that have languished over the previous year. One of those is my Indonesian language skills. Just as in Mathematics where I examine the number associated with my diurnal age, I thought I might be able to examine, on a daily basis, at least one Indonesian word or phrase that I was unfamiliar or uncertain about. 

I don't think my Indonesian language skills have improved much over the past year unfortunately and I failed to an Indonesian word or phrase on a daily basis. Let's look back at my posts over the years relating to the language:

There's enough material here for some useful revision. The problem with my posts is that I tend not to look back at them once I've made them. I need to keep looking for innovative ways to improve my language skills. 


Let's try chess. What are the Indonesian names for the various pieces and moves? Here are some taken from this website.
  • King - Raja
  • Queen - Menteri
  • Rook - Benteng
  • Bishop - Gaja
  • Knight - Kuda
  • Pawn - Pion/Bidak
  • Check - Skak
  • Checkmate - Skak Mati
  • Chess - Catur
  • Chess Pieces - Bidak Catur
  • Chess Board - Papan Catur
  • Chess Game - Percaturan
Just in conclusion, this tweet caught my eye and I decided to play the game.


I came up with FREEDOM, RELAXATION and PROGRESS. So this could define my year: feel that I have the freedom to experiment in whatever way I choose, enjoy the relaxation that comes from this sense of freedom and sit back and watch as I make awesome progress in Indonesian language skills, guitar playing, mathematics, gardening, chess, meditation or whatever else I find of interest.

It occurred to me that I should make more use of Pinterest. I've had an account for a long while now but haven't made much use of. To this end I've created a board called Indonesian Language and Figure 2 shows my first addition to it. Most of these words I already knew but it's important to be reminded of them and see them in print so that they embed themselves more deeply in my memory.


Figure 1

I've also started playing KATLA again. See Figure 2. It turns out that "kanal" is just the phonetic spelling of the English word "canal".


Figure 2

Tuesday, 19 October 2021

Chess Puzzles

Recently I was reading, on chess.com I think, how one of the best ways to improve your chess was via puzzle solving. To this end I found a relatively new site, that's free and offers a succession of puzzles to solve and rates your progress along the way. The site is https://chesspuzzle.net:


Figure 1 shows an example of the type of puzzles offered:


Figure 1

In a couple of days I've progressed from a starting level of about 1400 to my current rating of 1806 (on the 19th October 2021).


So far I'm enjoying my steady progress and finding the puzzles challenging but, given sufficient thought, quite solvable. Doubtless the level of difficulty will steadily increase. Meanwhile I continue to play a daily game against the computer on lichess.org with Stockfish set to level 6 of 8 levels:


So far I've not submitted to a rating, although I guess I should at some point. I prefer playing the computer with unlimited time control as I can relax and not feel under pressure as I would with time controls. I need to be more adventurous of course and face real opponents under time pressure. Figure 2 shows a crucial position from the last game that I played against Stockfish.


Figure 2

I had the White pieces and it was my turn to move. I hurriedly captured the pawn on c4 and, after an exchange of rooks, Black played Qa6. It was all over as Black can now penetrate to my 2nd rank and there is no defence against checkmate. If I'd played Qh4 instead and followed up with Qe2, things would have been very different. Here is the game in full:

Thursday, 17 December 2020

Stored Games on Lichess

I only realised today that Lichess saves all the games you play, provided you are registered. This is of course quite useful in analysing what went wrong. Figure 1 shows a position from a game I played last night and ended up losing, even though I thought I could win it or at least draw. Black has just captured, with a pawn, the white bishop on g6 that had previously captured the black bishop with check. It is now move 33 with white to play. 

Figure 1

I played my rook to e2 and lost ignominiously after 33...c7 c1+. The engine is recommending that I play 33 f1 g1 but even my 33. d2 e2 move all is not lost. The position is judged as equal. The critical position was reached in Figure 2, when it's white's turn to move and I played 33. b2 b1 and after 33...c8 c5 I'm finished. The recommended move is 33. b2 a3 and white has at least a draw.

Figure 2

I've embedded the game in this website:


I've been setting the lichess computer to level 6 which is apparently about 2300 level which is certainly strong enough for me. I've been playing at this level for my past few games now whereas previously I'd set it to the level 5. I'd won some games at that level but level 6 is certainly more challenging.

I'm reminded of that how many free resources are available now for improving ones chess prowess and I should be more active in taking advantage of them. Talking of which, I played my first rated game today and won easily. However, I'm sure that I'll meet much stronger players if I continue. Figure 3 shows a screenshot:

Figure 3

If you play 30 rated games, you get an official lichess rating so I should continue and try to get one. Of course, I should try to learn some of the more common opening traps that are about or else I'm bound to fall prey to some of them. I now have 88 games stored on lichess.

Wednesday, 13 May 2020

LICHESS.ORG

I need to keep practising how to embed chess games into my blog. I've done it before using chessbase but recently I played a game on lichess.org and I'm hopefully going to embed the game below:



At first I was disappointed because the game wouldn't display but then it clicked. It was a problem with the browser. I was using the Brave browser and when I switched to Chrome there was no problem. Even though I like supporting Brave, this is not the first little glitch that I've noticed with this browser.

One can also download the game as a pgn file and open it in another program like ChessX (that I have installed on my computer). Another interesting alternative offered by lichess.org is to turn the game into a gif (see Figure 1):


Figure 1

There is quite a good computer analysis offered of the game. A screenshot is shown in Figure 2:

Figure 2


One can also posts studies that lichess.org provides. Here is an example of one such study involving the fried liver attack that I have discussed in an earlier blog (Chess: The Fried Liver Attack).



These studies are a valuable resource and one that I should take advantage of. 

In the past, I've posted on chess a number of times but I hadn't really realised how much until I decided to collate them. The links to these posts are:
I should play online chess more frequently. I watch one or more of agadmator's Chess Channel videos most days but often go for days without playing a game. I should try to develop a rating on one or more of the available chess sites so that I can set some rating goal for myself.

Monday, 16 March 2020

An Historical Win

From time to time, I need to remind myself how to embed games into a Blogger post and so here I am again. This game I played in October of 1981 on the occasion of a match between two clubs, one of which (Rooty Hill) I belonged to at the time. I was lucky enough to win. It's a comedy of errors on both sides really once you analyse the moves carefully. I've added some annotations based on the Stockfish Engine suggestions.
[Event "Rooty Hill versus Smithfield"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Sean"] [Black "Lazaridiz"] [Result "1-0"] [ECO "C86"] [TimeControl "40 movies in 90 minutes"] 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Qe2 b5 7. Bb3 d6 8. c3 O-O 9. Rd1 Na5 10. Bc2 c5 11. d4 Qc7 12. d5 Bg4 { The best approach for Black is to reposition the Knight on f6 to b6 via d7} 13. Nbd2 { It's recommended that White play h3 to drive off the Bishop and then play b3 followed by c4.} 13... Nb7 { Recommended here is the Knight manouvre h5 to f4, striking at the Queen and establishing a strong outpost.} 14. Nf1 c4 15. Ng3 Nc5 16. h3 Bc8 { Bd7 would seem preferable here, although the plan is to position the Bishop on b7 presumably.} 17. Be3 { The best here seems to be b4 to drive the Knight away. If the pawn is taken en passant then there is still a pawn on b3 that can be moved to b4 to drive the Knight away.} 17... Rd8 18. Rd2 Ncd7 19. Ng5 Nf8 20. f4 exf4 { This definitely seems to be a mistake because it allows a Knight to later settle on d4. Best is still the Knight manouvre to f4 via h5.} 21. Bxf4 Ng6 22. Be3 Ne5 23. Nf3 Nfd7 24. Qf2 Nxf3+ 25. gxf3 Re8 26. Nf5 Bf8 27. Qg3 Ne5 28. Nd4 Qd8 29. Rg2 Qf6 { Advancing the pawn to g6 would be the best way to blunt White's attack.} 30. Bg5 Qg6 31. f4 { This is actually a blunder as White's previous advantage evaporates. However, Black does not take advantage of it by playing 31...f6.} 31... Nd3 { This move is inexplicable and completely disastrous as White completely regains the initiative.} 32. f5 Bxf5 { If 32...Qh5, then 33.Bd1 traps the Queen.} 33. exf5 Qh5 34. Bxd3 { 34.Bd1 doesn't work now because of 34...Re1+ but the recommended move is 34.Rf1 preparing to snare the Queen. However, Black would then have had time to manouevre the Knight to e4 via c5 to attack the White Queen.} 34... cxd3 35. Qxd3 h6 36. Bf4 { The far more aggressive 36.Bf6 is needed here.} 36... Qh4 37. Rg4 Re1+ 38. Rxe1 Qxe1+ 39. Qf1 Qe7 40. Bxh6 Qf6 41. Bg5 Qe5 42. f6 Re8 43. Ne6 { 43.fxg7 is crushing but this Knight move is far less effective.} 43... Qxd5 { Black should close up the position with 43...g6.} 44. Nxf8 Qc5+ 45. Qf2 Re1+ 46. Kg2 Qd5+ 47. Kg3 Qd3+ 48. Kh4 Re2 49. Qd4 Qf5 { Black should have exchanged Queens here.} 50. fxg7 f6 51. Qxf6 $155 { Engine stockfish-8-64} 1-0
I remember the prelude and the sequel to the match well. There were three other team members in a car that was being driven to the venue. One of the members was a Englishman with a thick Lancashire or similar accent. He worked as a plumber. We must have talking about what jobs each of us had and when he learned that I was a working as a psychiatric nurse at the time, he was not shy about expressing his disbelief that a man (a "real" man I guess he meant) could work in such a job. I could feel the two others cringe as he said this but I didn't get annoyed and went on to explain that males were necessary in psychiatric hospitals because sometimes patients became physically violent. He kept on mumbling about this till we go there. As it turned out, I was the only team member to win out of the eight who competed on the night. Another team member drew his game, so the final score was 1.5 to 6.5. Returning home in the same car, this guy was reluctant to give me credit for scoring the only win of the night. I never saw this guy again but I well remember him just because he was so unapologetically rude.

Figure 1 shows a copy of the original score sheet. It's surprising that it's survived after almost forty years.

Figure 1

Of course, it was played so long ago that's the moves are recorded in the old notational system that I grew up with and with which I'm still more comfortable with. Anyway, the algebraic system replaced it and that's that. There's a couple of moves on the other side of the sheet but I'll only show the first page here. In the sixties and early seventies, I used to play correspondence chess but none of those games survive.

Thursday, 31 January 2019

A Win Against Fritz

From time to time, I'll insert a chess game into this blog, played against Fritz on Chessbase. My main purpose in doing this is to keep practising how to insert a chess game into a blog or else I'll forget how to do it before very long. A secondary purpose is to keep a record of interesting games, preferably ones that I win but not exclusively. Here goes:
[White "Sean"] [Black "Fritz Club Level"] [Result "1-0"] [Termination "Fritz resigned"] 1.Nf3 d5 2.d4 h5 3.c4 Nf6 4.Nc3 e6 5.Bg5 Bb4 6.Qa4+ Nc6 7.a3 Bxc3+ 8.bxc3 Bd7 9.Qc2 dxc4 10.e4 e5 11.Bxc4 Qe7 12.0-0 0-0-0 13.d5 Na5 14.Bd3 Rde8 15.h4 c6 16.c4 b6 17.Rfb1 Kc7 18.Nd2 Kb8 19.Nb3 Nxb3 20.Qxb3 c5 21.a4 Qd6 22.Bd2 Kc7 23.a5 Ra8 24.f3 Rhb8 25.Qa3 Rb7 26.Bc2 Rab8 27.a6 Nxd5 28.cxd5 Ba4 29.Bxa4 Ra8 30.axb7 Rb8 31.Bc6 Rh8 32.Qxa7 Kd8 33.b8 Qxb8 34.Qxb8+ Ke7 35.Qb7+ Kf6 36.Bg5+ Kg6 37.Ra7 Rf8 38.Rxb6 Kh7 39.Be8 Kh8 40.Bxf7 Rd8 41.Be6 Rd7 42.Qxd7 Kh7 43.Qxg7#
There is a glitch in this game. White's 33rd move is 33.b8+Q, meaning that the pawn queens with check, but this was not recognised and play stopped at Black's 32nd move. The only way that I found to proceed was simply to write 33. b8. Ah well, nothing's perfect. To be honest, I blundered in this game on my ninth move. I forgot that my queen was vulnerable to a discovered attack from the black bishop after the knight moves away. In the original game, I played 9.e3 and black countered with 9...Nxd4. Oops! After my reconsidered 9.Qc2, I didn't make any more blunders and went on to win in grand fashion against a handicapped Fritz playing at club level.

Tuesday, 8 January 2019

Chess: A Personal History

I've just finished reading "The Immortal Game" by David Shenk. It's a brief history of chess set against the backdrop of the so-called Immortal Game played on June 21st  1851 in London between Adolf Anderssen (White), a famous player and informal world champion of the mid-19th century, and Lionel Kieseritzky (Black), another strong player of the day. It's an interesting approach: drip feeding the moves to the reader over the course of the various chapters while at the same time expatiating upon the historical, psychological and cultural aspects of chess in general.

A brief discussion of the moves involved in this famous game can be found on WikiBooks. Unfortunately for Kieseritzky, he died not long after playing this game. To quote from the book:
Kieseritzky ... would forever carry the moniker “Immortal Loser.” Upon returning home to Paris ... he was soon forced to fold his failing chess magazine as he struggled with his finances and his health. He died in a Paris mental hospital in 1853, just two years after his loss in the Immortal Game. He had no money to his name. No one in the chess world contributed to give Kieseritzky a decent burial. No one stood by his grave.
This got me thinking about my own chess history and I've chosen to document a little of my story here. Oddly, the story begins with my father when I was about eleven years of age. One day he decided that we should learn to play chess. I was agreeable. We went off in search of a former boarder in our house who was now living elsewhere but whom we remembered as having been a keen chess player. I can clearly remember him playing, some years before, against an opponent who was a boarder at my maternal grandparents' house. This would have been my earliest memory of a chess game.

My father and I never did find our former boarder. He had moved elsewhere. Regarding that other boarder who was English, he later returned to Britain but revisited Australia years later with an Irish bride in tow. By this time, I had learned to play chess and we played several games together when I was in my mid-teens. Back to the beginning and not long after our failed attempt to find the boarder, I somehow acquired a small fold-up chess set with magnetic pieces that included instructions as to how to move and thus I learned the basics of the game from this. My relationship with my father was never close and only worsened in my teenage years and I don't think he ever learned to play.

I can't remember the exact chronology but around 1964, the year that I was in Grade 10 of high school, I started to take the game very seriously. I purchased several books, amongst the first was Irving Chernev's "Logical Chess" of which I still have a physical copy. It's one of the very few books to survive from my youth. Up until the composition of this post, I'd not been able to find an electronic version of the book but happily I have now obtained one. It's been converted into algebraic notation whereas the original edition that I had used descriptive chess notation (P-K4 etc.). The latter was the most widely used notation in the 1960's and I found it quite difficult to adapt to the algebraic notation that came to dominant in the 1970's. It's as if my brain had been hard-wired with the classical notation but the algebraic to me lacked "magic". I felt there was something magical about 1. P-K4 whereas I felt nothing for 1. e4. Strange, I know, but there you have it.

There has been some criticism of Chernev's book in later years (read these forum comments on chess.com) but to me, at the time, it was a wonderful book and I pored over it in an effort to improve the quality of my play. My best friend at school also became interested in the game and during our remaining high school years we played a great many games. I subscribed to a chess magazine (the name of which eludes me) and I read other chess books including Lasker's "Common Sense in Chess" and "My System" by Aron Nimzowitsch. This was an exciting time for chess. Bobby Fischer's star was on the rise and the supremacy of the Soviet chess machine was being challenged.

Grandmaster Yuri Averbakh
During my year at University (1967), I remember watching a simultaneous exhibition by the well-known Russian grandmaster Yuri Averbakh. This was my first ever time seeing a grandmaster in action. He is still alive believe it or not, aged 96. I've included a photo of him here in his prime rather than one of him as he now looks. My friend from school also attended University but he was beginning to show signs of the paranoid schizophrenia that would overwhelm him in the early years of the next decade. His interest in chess was declining and I guess my initial enthusiasm had faded as well. I did play correspondence chess on and off for a couple of years in the early 70's which was quite tedious because a letter needed to be posted for each move. For most of the decade however, I just played in a desultory fashion.

For some reason, in the early 80's I joined a local chess club and enjoyed a brief flush of fame when our team headed off one evening to play a rival team. The team size was eight as I recall and we were comprehensively beaten 1.5 to 6.5 with all players beaten except for me, who secured a win with the white pieces playing a Ruy Lopez, and another team member who managed a draw. Not longer after that I headed off with my family to Britain and while travelling around there, my interest in the game was rekindled. I remember buying a copy of Reuben Fine's "Basic Chess Endings" and studying it very enthusiastically.

What I lacked over the years since my schooldays was a regular opponent and it was only between 1985 and 1987 that I become friends with a German guy who enjoyed chess and Stratego. On many Friday nights during that time, I would drop by his unit and we would enjoy wine and nibbles while playing firstly a few games of Chess before finishing up with a game of Stratego. I remember he bought what must have been at the time one of the first electronic devices capable of playing chess. I knew that the limitations of such devices were most glaring in the end game and so, on the few occasions that I played it, I usually managed to win by simplifying as quickly as possible into an advantageous end game. However, I much preferred my human antagonist and I have fond memories of that period and all the wine-sodden games that we played together.


At various times during my high school teaching career I've supervised school chess teams but that usually involved driving the students to the opposing team's venue or hosting the opposing team at our school. The students who signed up for the team could already play and I didn't really spend much time teaching them about chess. With the advent of computers and later smartphones, I played many desultory games against my electronic adversaries but it was only after retiring in 2015 that I found I had a lot of spare time and my enthusiasm for chess was rekindled. I became aware of the extensive resources available online for playing chess, improving one's level of play and just finding out more about the game in general. An interest in learning about the personalities and styles of the leading players of the day had characterised my early association with chess and now more than 50 years later, that same interest had been rekindled. I've come full circle.

Monday, 7 January 2019

Toroidal Chess

I'd heard about toroidal chess but thought such a game was rather silly because how could you practically play chess on a toroidal board. Even with magnetic pieces attached to a metallic toroidal board, playing comfortably would be almost impossible. It came as something of a revelation that this variant of chess could be played quite easily on a standard chess board.

Diagram 1
To see how, let's start with a cylinder chess which, as the name suggests, is played on a cylindrical board in which the left hand side of the board is joined to the right hand side. Here are some excerpts from what Wikipedia has this say about cylinder chess:

The game is played as if there is no edge on the side of the board. When a piece goes off the right edge of the board in cylinder chess, it reappears on the left edge; when a piece goes off the left edge, it reappears on the right edge (see Diagram 1) ... bishops are more valuable in this variant ... the game is sometimes played with changed rules for castling ... some cylinder chess problems allow moves that don't change the position (null moves). 

In Diagram 2 an example of such a problem is shown. The solution is to put Black in zugzwang by playing 1.Rh4-h4. Now, after any move by Black, White has a mate. The move 1.Rg4 doesn't work because of 1...Ka5 threatening to capture the rook on h6.


Diagram 2

It took me a while to understand what was happening in Diagram 2 but I eventually got it. Certainly it takes some getting used to. However, things getting far more difficult once the bottom of the board is joined to the top to create the torus. This also brings the White and Black back ranks up against each other, which necessitates a repositioning of the initial starting position of the pieces.

This revised starting position is shown in Diagram 3. Note that "in the starting setup, the rooks protect each other, while being threatened by the opponent's rooks. They are supported by the knights on the sides of the board, making their positions more defensible" . A reason for moving the Knight from its usual position is that if "the knight starts from its normal starting square, say g1 ... (then) moving through h1 to a1, it can then make the orthogonal move to a8, potentially taking a rook!" Further advice is to "watch out for diagonal attacks from pawns positioned on the side of the board" and to "note that the queens threaten the rooks at a1 and a8, making the rooks on that side of the board slightly less secure than the king's side rooks"(link).

Diagram 3
I should add that there is no castling and only pawns on the a, b, g, and h files can move two spaces on their first turn, and consequently, those are the only pawns that en passant can apply to. A piece cannot move eight spaces and wrap around to its starting position and be considered to have moved - all moves must change the board position. There seems to be a site where one can play toroidal chess on the Internet. I checked it out but there weren't any other online players at that time. There is another site where a wide variety of chess variants can be played, including Cylinder Chess and Fischer Random Chess but not apparently toroidal chess. The site seems to be quite active although I haven't tested it out.

I'm not all that keen to attempt to play either cylinder chess or toroidal chess. I find the conventional game demanding enough and there's something comforting about having all the action confined to the 64 checkered squares with rigid borders at the top and bottom, left and right. Once one or both of the borders are removed, the nature of the game seems to be fundamentally altered. It's interesting nonetheless and I was drawn to it via the mathematical problem of how many ways can two non-attacking amazons be placed on an n X n toroidal chess board. I wrote about this in a post to my mathematics blog titled The Mathematics of Chess.

Saturday, 8 December 2018

Playing Fritz

After a lengthy absence, I played an online game against Fritz on chessbase.com and was going fairly well up until move 29 when I blundered. It's been a while since I inserted a game into a blog and you need to practise these techniques or else you quickly forget. So here goes.
[White "Sean"] [Black "Fritz Club Level"] [Result "0-1"] [Termination "voodooguru23 resigned"] 1.Nf3 d5 2.e3 Nf6 3.c4 c6 4.d4 e6 5.Nc3 Nbd7 6.Be2 Nb6 7.b3 Nbd7 8.0-0 b6 9.Bb2 Bb4 10.Qc2 Bb7 11.Bd3 0-0 12.a3 Be7 13.b4 c5 14.bxc5 bxc5 15.cxd5 exd5 16.Rab1 c4 17.Be2 Qb8 18.Nd2 Qc7 19.e4 dxe4 20.Ndxe4 Bxe4 21.Nxe4 Nxe4 22.Qxe4 Rae8 23.Qc2 Bd6 24.g3 Rc8 25.Qc3 Rfe8 26.Bf3 Nf6 27.Rfe1 Rxe1+ 28.Rxe1 Rb8 29.Re2 Rb3
OK, looks like I've succeeded. Reviewing the game, I simply didn't see the black rook sweeping down to b3. However, if I'd taken the time to tuck my white-squared bishop into the fianchettoed pawn position that was already set up, I might have had a chance. As it turned out, I lost a piece outright and it was all over really. Even if I move the queen to e1 and threaten problems on the black's back rank, the move Qb8 is decisive. Ah well. I should keep practising and remember not to leave pieces completely undefended because they then become targets for attack. In this case, my queen was attacked and the undefended white bishop. I couldn't save both. Below is a continuation after I retracted my losing move and in which I manage to secure a draw by perpetual check. I should practise inserting comments into games as well.
[White "Sean"] [Black "Fritz Club Level"] [Result "1/2-1/2"] 1.Nf3 d5 2.e3 Nf6 3.c4 c6 4.d4 e6 5.Nc3 Nbd7 6.Be2 Nb6 7.b3 Nbd7 8.0-0 b6 9.Bb2 Bb4 10.Qc2 Bb7 11.Bd3 0-0 12.a3 Be7 13.b4 c5 14.bxc5 bxc5 15.cxd5 exd5 16.Rab1 c4 17.Be2 Qb8 18.Nd2 Qc7 19.e4 dxe4 20.Ndxe4 Bxe4 21.Nxe4 Nxe4 22.Qxe4 Rae8 23.Qc2 Bd6 24.g3 Rc8 25.Qc3 Rfe8 26.Bf3 Nf6 27.Rfe1 Rxe1+ 28.Rxe1 Rb8 29.Rc1 Qb6 30.Rc2 Qc7 31.Bc1 h6 32.Bg2 Re8 33.Be3 Qb8 34.Qxc4 Qb1+ 35.Rc1 Qb2 36.a4 Ng4 37.Rc2 Qa3 38.Rc3 Qb2 39.Rc2 Qb1+ 40.Rc1 Qb2 41.Rc2 Qb1+ 42.Rc1 Qb2 43.Rc2 Qa3 44.Rc3 Qb2 45.Rc2 Qb1+

Wednesday, 7 March 2018

CHESS: THE ELEPHANT GAMBIT

The Elephant Gambit was played against me in one of my blitz games on chess.com. I can't recall how I fared but I remember being surprised and it's certainly a good choice by Black when playing blitz chess. The essential position is shown below:


Here is an interesting video of a game involving this gambit that was played in the middle of the nineteenth century:


There is an interesting collection of games involving the elephant gambit on chessgames.com, all involving wins for Black. Here is the most recent game shown on that site:
[Event "Russian Team Championships"] [Site "Sochi RUS"] [Date "2012.04.10"] [EventDate "2012.04.09"] [Round "2"] [Result "0-1"] [White "Alexej Gorbatov"] [Black "Pavel Skatchkov"] [ECO "C40"] [WhiteElo "2363"] [BlackElo "2486"] [PlyCount "110"] 1. e4 e5 2. Nf3 d5 3. d4 dxe4 4. Nxe5 Bd6 5. Bf4 Nf6 6. Bc4 O-O 7. Nc3 Nc6 8. Nxc6 bxc6 9. Bg5 Bf5 10. O-O h6 11. Bh4 Re8 12. Re1 Rb8 13. a3 Bf4 14. b3 e3 15. f3 Qd6 16. g3 e2 17. Nxe2 Be3+ 18. Kg2 g5 19. g4 Nxg4 20. Bg3 Nf2 21. Bxf2 Bxf2 22. Rf1 Be3 23. Ng3 Bg6 24. c3 c5 25. dxc5 Qxc5 26. Qd5 Rbd8 27. Qxc5 Rd2+ 28. Kh3 Bxc5 29. b4 Bd6 30. Ra2 Rxa2 31. Bxa2 Re3 32. Kg4 Rxc3 33. Bb1 Rxa3 34. Bxg6 fxg6 35. Ne4 Bf4 36. Kh3 Rb3 37. Rf2 Rxb4 38. Nf6+ Kf7 39. Nd5 Rd4 40. Nxf4 Rxf4 41. Kg3 Rb4 42. Rc2 Rb7 43. Rc6 a5 44. Ra6 c5 45. Rxa5 Rc7 46. Kf2 c4 47. Ke2 c3 48. Kd1 c2+ 49. Kc1 Rc3 50. Ra2 h5 51. Rxc2 Rxf3 52. Kd1 Re3 53. Rf2+ Kg7 54. Kd2 Ra3 55. Kc1 g4 0-1
Certainly an interesting game as well. 365chess.com has a useful analysis of the main variants of this opening:


As the chart shows, 3.exd5 or 3.Nxe5 offer the best chances for White and by clicking on the possibilities in the left-hand column, the common moves in these sub-variants can be explored. For example, 3.exd5 leads to these main variations:


Clearly, Black must proceed with either 3...e4 or 3...Bd6 or else the future looks grim. I like the layout of the 365chess.com website, it's very easy to navigate.

Saturday, 24 February 2018

CHESS: An Unlikely Win

Visiting chess.com for the first time and registering, I was tinkering around the site when I accidentally found myself in a 5 minute game against a human. I thought I was playing against a chess engine. I wasn't familiar with the interface and so I was only aware of my opponent's remaining time, which I thought was referring to me. It was only as a time flashed in red at the bottom of my screen that I realised I had only seconds remaining. Luckily and remarkably I managed a checkmate. My opponent still had over two minutes remaining on the clock. It's not a great game and the checkmate could have been easily averted had my opponent blocked with the Knight and not the Bishop. Nonetheless, it boosted my meagre confidence as my rating soared from the default starting value of 1200 to 1362! I'm inclined to take on some more human opponents and see if I can further improve my rating.

The chess.com website stores your games and allows for the game to be downloaded as a PGN file. It's remarkable to think how much chess has changed since I played correspondence chess by mail in the late 60's and early 70's. I used to receive a chess magazine in the mail and that was my sole source of information about what was happening in the world of chess. Now there is live streaming of every major tournament and there are hundreds of chess sites to choose from. Here is the game:
hite "michaelgould321"] [Black "voodooguru23"] [Result "0-1"] [ECO "C50"] [WhiteElo "1038"] [BlackElo "1362"] [TimeControl "300"] [EndTime "4:26:10 PST"] [Termination "voodooguru23 won by checkmate"] [CurrentPosition "r4r2/pp3ppk/2p3b1/n3p3/4P2P/q2P4/2PNQP2/1BKR3R w - - 0 22"] 1.e4 {[%clk 0:04:58]} e5 {[%clk 0:04:57]} 2.Nf3 {[%clk 0:04:56]} Nc6 {[%clk 0:04:54]} 3.Bc4 {[%clk 0:04:49]} d6 {[%clk 0:04:45]} 4.d3 {[%clk 0:04:39]} Nf6 {[%clk 0:04:37]} 5.a3 {[%clk 0:04:38]} Be7 {[%clk 0:04:31]} 6.Be3 {[%clk 0:04:36]} O-O {[%clk 0:04:28]} 7.Nbd2 {[%clk 0:04:33]} Bg4 {[%clk 0:04:14]} 8.h3 {[%clk 0:04:30]} Bh5 {[%clk 0:04:10]} 9.g4 {[%clk 0:04:25]} Bg6 {[%clk 0:04:07]} 10.Qe2 {[%clk 0:04:22]} h6 {[%clk 0:04:00]} 11.O-O-O {[%clk 0:04:21]} Na5 {[%clk 0:03:34]} 12.Ba2 {[%clk 0:04:14]} c6 {[%clk 0:03:20]} 13.Rhg1 {[%clk 0:04:10]} d5 {[%clk 0:03:00]} 14.g5 {[%clk 0:04:04]} hxg5 {[%clk 0:02:50]} 15.Nxg5 {[%clk 0:04:00]} Nh7 {[%clk 0:02:08]} 16.Nxh7 {[%clk 0:03:50]} Kxh7 {[%clk 0:01:55]} 17.Rh1 {[%clk 0:03:36]} d4 {[%clk 0:01:34]} 18.Bxd4 {[%clk 0:03:16]} Qxd4 {[%clk 0:00:44]} 19.h4 {[%clk 0:03:06]} Bxa3 {[%clk 0:00:13]} 20.bxa3 {[%clk 0:02:56]} Qa1+ {[%clk 0:00:08]} 21.Bb1 {[%clk 0:02:54]} Qxa3# {[%clk 0:00:05]} 0-1

Thursday, 22 February 2018

CHESS: THE MARSHALL ATTACK

An article on ChessBase alerted me to a recent twitter post by Julian Assange containing a screenshot of a chess position. Here is the diagram:


It didn't take someone long to identify the provenance of this position. It's from a 1918 game between Jose Raul Capablanca and Frank Marshall and shows the position at the end of the 24th move. The full game is displayed at the bottom of this post (for some reason the names are not being displayed: Capablanca is White). I located the game at chessgames.com, a site that with an impressive database of games that is freely accessible and downloadable. I've registered on this site and look forward to accessing more games. There is a premium membership option but I'll be exploring the free options.

Here is an excerpt about the so-called Marshall Attack that was employed in this game, taken from Wikipedia from the Wikipedia article about the Ruy Lopez.
One of Black's more aggressive alternatives is the Marshall Attack: after 3...a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.c3 Black plays the gambit 8...d5, sacrificing a pawn. The main line begins with 9.exd5 Nxd5 (9...e4?!, the Herman Steiner variation, is considered weaker) 10.Nxe5 Nxe5 11.Rxe5 c6 (Marshall's original moves, 11...Nf6, and 11...Bb7 are considered inferior, but have also yielded good results at top levels of play for Black. GM Joel Benjamin suggests that 11...Bb7 is inferior due to 12.Qf3).   
To the casual observer it might seem that Black has been careless and lost a pawn; however the sacrifice has also stripped White's kingside of its defenders, given Black a lead in development, and rendered White's 8.c3 irrelevant. Since Black's compensation is based on positional rather than tactical considerations, it is difficult or perhaps impossible to find a refutation. Black generally goes all-in with a massive kingside attack, which has been analysed to great depth (sometimes beyond move 30) with no definite conclusion as to the Marshall's soundness. The Marshall Attack is a very sharp opening system in which a great amount of theoretical knowledge is vital, and many White players, including Garry Kasparov, avoid it by playing one of the anti-Marshall systems, 8.d4, 8.a4 or 8.h3 instead of 8.c3. 
This gambit became famous when Frank James Marshall used it as a prepared variation against José Raúl Capablanca in 1918; nevertheless Capablanca found a way through the complications and won. It is often said that Marshall had kept this gambit a secret for use against Capablanca since his defeat in their 1909 match. The most common counterclaim is that Marshall had used a similar approach in 1917 against Walter Frere. However Edward Winter found no clear evidence of the date for Frere vs Marshall; several games between 1910 and 1918 where Marshall passed up opportunities to use the Marshall Attack against Capablanca; and an 1893 game that used the same line as in Frere vs Marshall. 
Improvements to Black's play were found (Marshall played 11...Nf6!? originally, but later discovered 11...c6!) and the Marshall Attack was adopted by top players including Boris Spassky, John Nunn and more recently Michael Adams. In the Classical World Chess Championship 2004, challenger Peter Leko used the Marshall to win an important game against World Champion Vladimir Kramnik. Currently, Armenian Grandmaster Levon Aronian is one of the main advocates for the Marshall Attack.
[Event "New York"] [Site "New York, NY USA"] [Date "1918.10.23"] [EventDate "1918.10.23"] [Round "1"] [Result "1-0"] [White "Jose Raul Capablanca"] [Black "Frank James Marshall"] [ECO "C89"] [WhiteElo "?"] [BlackElo "?"] [PlyCount "71"] 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 Nf6 12.Re1 Bd6 13.h3 Ng4 14.Qf3 Qh4 15.d4 Nxf2 16.Re2 Bg4 17.hxg4 Bh2+ 18.Kf1 Bg3 19.Rxf2 Qh1+ 20.Ke2 Bxf2 21.Bd2 Bh4 22.Qh3 Rae8+ 23.Kd3 Qf1+ 24.Kc2 Bf2 25.Qf3 Qg1 26.Bd5 c5 27.dxc5 Bxc5 28.b4 Bd6 29.a4 a5 30.axb5 axb4 31.Ra6 bxc3 32.Nxc3 Bb4 33.b6 Bxc3 34.Bxc3 h6 35.b7 Re3 36.Bxf7+ 1-0

Saturday, 23 December 2017

CHESS: A BUMBLED DRAW

I played a game at club level against Fritz Online and remembered that one needed a premium account to export files in PGN format. So I took a screenshot of the PGN displayed on Fritz Online and tried unsuccessfully to use OneNote and Google Docs to convert the image to text. Apparently it can be done but it defeated me. I turned to Google Keep and fortunately it was a very straightforward process. So I pasted the text into ChessX and things worked fine, so now I'm pasting the game into this blog. It's a game I should have won I'm sure but in the end was lucky not to lose, having overlooked a pin to my Queen from Fritz's Rook.
[Event "Casual Match"] [Site "Spring Hill"] [Date "2017.12.23"] [Round "4"] [White "Fritz: set to club player handicap"] [Black "Sean Reeves"] [Result "1/2-1/2"] [ECO "E15"] 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.Qc2 Bb7 6.Bg2 c5 7.e3 Nc6 8.0-0 Rc8 9.a3 h6 10.Nbd2 Be7 11.b3 0-0 12.Bb2 cxd4 13.exd4 Qc7 14.Rac1 Rcd8 15.Rfe1 g5 16.Ne5 Nxe5 17.dxe5 Nh7 18.Be4 Bxe4 19.Nxe4 Qc6 20.Rcd1 b5 21.c5 Rb8 22.b4 Ra8 23.Nd6 Rab8 24.Rd2 Rbd8 25.Red1 Kg7 26.g4 Kg8 27.Rd3 Rb8 28.Rh3 Kg7 29.Ne4 Rfe8 30.Rd6 Bxd6 31.exd6+ f6 32.Nxf6 Nxf6 33.Bxf6+ Kxf6 34.Rxh6+ Ke5 35.Qc3+ Kd5 36.Qd3+ Ke5 37.f4+ gxf4 38.Rh5+ Kf6 39.g5+ Ke5 40.g6+ Kf6 41.Rh6 Rg8 42.g7+ Kxg7 43.Qg6+ Kf8 44.Rh8 Rxh8 45.Qf6+ Kg8 46.Qg6+ Kf8 47.Qf6+ Kg8 48.Qg6+ Kf8 1/2-1/2
It would seem that 39.g5+ was not the best move and that better would have been 39.Qh7 after which it's clearly curtains for Fritz. White has the luxury of not being able to be checked by the Black Queen, even though quite exposed. The g pawn is a shield against the Black Rook but this pawn was lost when I followed the line that I did.

Sunday, 10 December 2017

CHESS: HOW TO EMBED A FULL CHESS GAME IN A BLOG

In this blog post I challenged myself to learn how to embed an entire game into a blog post, specifically this current blog post. I succeeded without too much difficulty. I've embedded a rather wild game from the Spassky versus Fischer World Championship Match in Reykjavik in 1972.

To get it to work (using the information on chessbase link), the PGN file is pasted into the HTML between DIV tags as follows:

Then some Javascript needs to be pasted in so that the ChessBase server can be accessed.


This is similar to how LaTeX gets rendered when I'm creating a mathematical post. While viewing in a browser in Android however, the LaTeX doesn't get rendered whereas with the embedded chess game, it does. However, in the Blogger app for Android, it is not displayed.

I guess what I need to investigate now is what control I have over how the game appears and what other chess websites provide this sort of service.
[Event "World Championship 28th"] [White "Spassky, Boris V"] [Black "Fischer, Robert James"] [Site "Reykjavik"] [Result "1–0"] [Date "1972.08.06"] [WhiteElo "2660"] [BlackElo "2785"] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Qb6 8. Qd2 Qxb2 9. Nb3 Qa3 10. Bxf6 gxf6 11. Be2 h5 12. 0-0 Nc6 13. Kh1 Bd7 14. Nb1 Qb4 15. Qe3 d5 16. exd5 Ne7 17. c4 Nf5 18. Qd3 h4 19. Bg4 Nd6 20. N1d2 f5 21. a3 Qb6 22. c5 Qb5 23. Qc3 fxg4 24. a4 h3 25. axb5 hxg2+ 26. Kxg2 Rh3 27. Qf6 Nf5 28. c6 Bc8 29. dxe6 fxe6 30. Rfe1 Be7 31. Rxe6