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Piotr Korobkov vs Rybka (Computer)
? (2008), Feb-26
Catalan Opening: Open Defense (E04)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
Apr-05-08  jadedpawn: 30. Rb6! threatning Rxc6! Rxc6 e6! when Rxe6 would be met by Qxe6! fxe6 f7+ and white will be up a rook.
Apr-05-08  computer chess guy: I am not sure where this game was played .. ICC?

Korobkov actually missed a win with 34. ♖f3!, exploiting the position of the Black Queen. Shredder predicts 34. ♖f3 ♗d7 35. ♕c3 hxg4 (if Black tries anything else, then White will play ♗f2) 36. hxg4 ♗xg4 37. ♖h2, and the Queen is lost.

May-22-11  Thucydides: After some analysis with Crafty, I find 31. ...h5 to be a mistake. Black is left with no good options after 32. Rb2. If play continues as in the text, with 32. ...a4 33. Rg2 Ree8, White responds 34. Qc3, achieving a winning position after 34. ...Rb8 35. Rf1 hxg4 36. hxg4 Rg6 37. Rh2 Bd7 38. Qf3 Kg8 39. Rxh4 gxh4.

If Black instead continues 32. ...Rg6, White's response 33. Qg3!, targeting f8, will create two passed pawns and win the game shortly.

32. ...c3 also fails, since after 33. Qxc3 hxg4 34. hxg4 Qxg4+ 35. Rg2 Qxf5 36. Rh2+ Qh7 37. Qh3 Qh4 38. Bf2, White is assured the win.

32. ...hxg4 fails in a similar fashion. White wins after 33. hxg4 Qxg4 34. Rg2 Qxf5 35. Rh2+ Qh7 36. Qh3 Qh4 37. Bf2.

32. ...Bd7 is Black's best option, and Crafty finds White attaining an advantage of about a pawn-and-a-half.

In short, it seems that Korobkov missed some nice opportunities before the final 36. Rh2 (missing 36. Rf3) gives Rybka an even game. It's nice to see that the machine Rybka, though not mortal, is beatable.

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