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Stockfish (Computer) vs Rybka (Computer)
"One Fish, Two Fish, Little Fish, Stockfish" (game of the day Jul-15-2014)
nTCEC - Stage 4 (2013), http://www.tcec-chess.net, rd 7, Apr-17
Alekhine Defense: Four Pawns Attack. Main Line (B03)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Aug-18-13
Premium Chessgames Member
  Ron: 31. Rxf5!!

Sunday level puzzle difficulty. The move is probably sound--one of the top chess programs played it against another elite program.

Jul-08-14
Premium Chessgames Member
  eternaloptimist: One Fish, Two Fish, Little Fish, Stockfish
Jul-15-14
Premium Chessgames Member
  Phony Benoni: To understand the pun more completely, you need to know that <Rybka> in Czech, means "Little Fish". You also need some familiarity with the oeuvre of Dr. Seuss.

31.Rxf5 is indeed a nifty piece of business, as is 28.Bxh6.

Jul-15-14
Premium Chessgames Member
  Infohunter: <Phony Benoni: To understand the pun more completely, you need to know that <Rybka> in Czech, means "Little Fish".>

Also in Polish.

Jul-15-14
Premium Chessgames Member
  al wazir: Why didn't white play 35. Rf6 ?
Jul-15-14  shivasuri4: <al wazir>, I guess 35.Rf6 wins too, but Black can hang on for a move longer after 35...Rg5, when White will have to play 36.Rxf7+ anyway.
Jul-15-14  dunican: <Petalsian> I hate to say but 35..Kg8 is illegal. Any king move following 35. Rf6 leads to Qxh6#.
Jul-15-14  Petalsian: i mean 35.Rf6 Rg7 36.Qxa6 Kg8.Thanks <dunican> for pointing that out.
Jul-15-14
Premium Chessgames Member
  eternaloptimist: <Phony> You hit the nail on the head w/ your explanation of my pun! I based it off of theáclassicáDr. Seuss book "One Fish, Two Fish, Red Fish, Blue Fish". I had several Dr. Seuss books when I was a kid including this book which I really enjoyed. Stockfish did a great job of blasting through Rybka's ♔side position to win the game! Stockfish did a better job of gaining space & controlling the key f5 square than Rybka did. Stockfish's ♕ was a major factor by forcing Rybka to make defensive moves (1 of which was 1 of Rybka's ♘s giving up the ghost). It also loaded up on the f-file w/ heavy pieces, eliminated Rybka LS♗ & put its own LS♗ on the b1->h7 diagonal which led to a loss for Rybka! á
Jul-15-14  sfm: You really need to be a computer to understand a move like 14.Bc1 Nice game.
Jul-15-14  gerryrulloda: Ya, what was the logic behind 14. Bc1?
Jul-15-14  Conrad93: <gerryrulloda: Ya, what was the logic behind 14. Bc1?>

Maybe white wanted to keep the option of Ba3 as a possibility, otherwise I have no clue.

Jul-15-14  Conrad93: 14. Bc1 also allows white to play Bd3, and adds an extra defender to the d pawn.
Jul-15-14  Howard: Moves like 14.Bc1 help show that chess is truly an inexhaustible game!
Jul-15-14  shivasuri4: 14.Bc1 is played perhaps with the idea of 15.Na4, threatening to trap the bishop after a3.
Jul-15-14  Conrad93: That also makes sense.
Jul-15-14
Premium Chessgames Member
  kevin86: How does a computer say "I'm confused"? Resign...
Jul-15-14  Chris321: Even computer programs this good struggle to find playable positions with the Alekhine,just like Alekhine himself,just one more example why you don't see an Alekhine's defence in WC matches,this is Hypermodern Strategy that doesn't quite work,it loses too much of the centre early on and never catches up again.
Jul-15-14
Premium Chessgames Member
  Once: <gerryrulloda: Ya, what was the logic behind 14. Bc1?>

Some random thoughts ...

We have a relatively fluid and open position which ought to favour bishops over knights. So I guess that Stockfish didn't "want" to give up the bishop pair. White would be "happy" if he (she? it?) can force Rybka to play Bxc3.

Hence the "plan" of Bc1, Na4, a3 and (if needed) b5.

The question which intrigued me is why not simply play 14. a3. Presumably Stockfish found a deep variation where white wouldn't need to play a3 and so saved a little time.

My much more primitive iteration of Fritz thinks there is not much to choose between 14. a3, 14. Bc1 and 14. Be3. All give a white advantage of around half a prawn.

Which coincidentally is all you actually get to eat once you have pulled off all the grubby bits and armour.

Jul-15-14  Nova: If you didn't know both these were computers (and maybe taking out the Bc1 move) you would think White was a human, making logical moves like doubling on the f-file, playing Qh4-g4, then g4 and h4ůsome common attacking ideas. Then comes Bxh6 and Rxf5! when you might go further and imagine White is a strong player.
Jul-16-14
Premium Chessgames Member
  eternaloptimist: Several people have mentioned 14.♗c1 & I must admit I've been wondering why Stockfish played this intriguing move. The ♘a4 -> a3 -> b4 (if needed) plan might work eventually but some preparation would be necessary b/c there would be a hole on b3 after a3 is played. If that plan would've been implemented too soon, then ...♕d5 (controlling the hole on b3) -> ...♘b3 (attacking the ♖ on a1 & the ♗ on c1). Since Rybka's B on f5 controls the b1 square, Stockfish wouldn't be able to move the ♖ there. If the move ...Nb3 was played right after a3, then b4 couldn't be played until after the N on b3 moves or until it is captured. Although if the necessary preparatory moves were played then the Na4 -> a3 -> b4 plan could work.

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