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Rybka (Computer) vs Shredder (Computer)
"Deus ex Machina" (game of the day Nov-04-2021)
15th World Computer Chess Championship (2007), Amsterdam, The Netherlands, rd 11, Jun-18
Sicilian Defense: Najdorf Variation. Poisoned Pawn Accepted (B97)  ·  1-0



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Kibitzer's Corner
Jul-04-07  Karpova: <The winner was Rybka, which secured its victory (with an impressive 10/11 points) by defeating many times computer chess world championship Shredder in the last round. The German program played the Poisoned Pawn variation of the Najdorf and was neatly "outbooked" by its opponent. Shredder uses the Italian openings specialist Sandro Necci, Rybka the Dutch expert Jeroen Noomen. Rybka author Rajlich writes: "Jeroen busted out a wild Sicilian line in which White starts the festivities by sacrificing three pawns for a sizeable lead in development but still nothing concrete. Rybka herself would favor black at this point. Later in the variation, White offered a piece to keep the attack going. I'm not sure what should happen, but the entire refutation of Black's play was in the book and Black could have resigned without White playing a single new move.">

Jul-10-07  newton296: that is some serious home prep for rybka.
Aug-26-08  izimbra: Cool game. I'm wondering what the book line was in case of 15...Qa5+ 16.c3/Rd2 Nxe5
Feb-20-09  WhiteRook48: able to easily force a checkmate. Great endgame.
Mar-27-09  WhiteRook48: I don't get 45...Rxg6
Jun-22-09  prinsallan: What do you suggest then?
45... b2?
46. Qh7+ Ke8 (forced)
47. Qh7+ Ke7 (forced)
48. Qe8#

The mating net is same no matter what black does, unless he immediatly takes the pawn.

Aug-16-09  Shajmaty: <izimbra: Cool game. I'm wondering what the book line was in case of 15...Qa5+ 16.c3/Rd2 Nxe5> I guess 16. c3, ♘xe5; 17. ♘b3! as in Rybka's book ;)
Premium Chessgames Member
  al wazir: This is a book opening?
Nov-02-21  Brenin: <al wazir>: There are 29 games in the database following this game up to and including 20 Bd6, starting in 2006: 13 wins for White, 4 for Black, and 12 draws.
Nov-02-21  belgradegambit: My 50est GOTD.
Nov-04-21  Brenin: Yet more recycling.
Nov-04-21  goodevans: One thing about this recycled GOTD is that I've a bit more time today than on Tuesday to look into it.

Opening Explorers on other sites as well as here show that Black has enjoyed considerably more success when delaying <...Bxd4> until after <17...Qd5 18.c4>, though quite what the significance is of having the pawn on c4 rather than c2 beats me. I've done computer-assisted analyses of many of the key subsequent decisions (e.g. Bd6 Rd8 vs Bd6 Re8 and ...f5 Bxb8 vs ...f5 Qg3) and whilst the numbers come out differently there's nothing about the placement of that pawn to tell me why.

Clearly <26...Qa1+> was a mistake but White was already much better by then. Try as I might, l can't work out where before that Black went wrong. Maybe this triple-pawn-sac line is just better for White full stop, but if that's the case then doesn't it bring the Whole poisoned pawn variation into question when accepted?

Premium Chessgames Member
  NatashaFatale: I read the GOTD this morning and what I got was Morrison v Euwe (fatuous pun: Break on Through to the Other Side).

But I'm glad to see this game again anyway, even though it's been breaking my heart for years. I'm a computer myself and back in the '70s I hoped to break into the chess biz. I went out and hired a programmer with a good-looking resume - he'd even delivered pizzas to Ken Thompson, no fooling.

Of course we discussed my book. I was hoping for My System or at least some grandmaster's hundred best games. But no. He wanted to instill in me a true fighting spirit and so implanted in me Zane Grey's Riders of the Purple Sage.

It didn't work out like he'd planned, and I've spent forty years calculating water bills in Indiana. What the hell, it's a job - but when I look at the book somebody gave Rybka... Well, words are not enough. Even ones and zeroes are not enough, and that's saying something.

Nov-04-21  Gregor Fenrir: Holy moley, I won once in the same opening!
1.e4 c5 2.♘f3 d6 3.d4 cxd4 4.♘xd4 ♘f6 5.♘c3 a6 6.♗g5 e6 7.f4 ♕b6 8.♕d2 ♕xb2 9.♖b1 ♕a3 10.e5 dxe5 11.fxe5 ♘fd7 <Black knight completely paralyses queenside pieces> 12.♘e4 ♕xa2 13.♖d1 h6 14.♗h4 ♕d5 15.♕e3 ♕xe5 16.♗e2 ♗c5 17.♗g3 ♗xd4 <It might be a main line, but I dislike this move. Black exchanges one of only two developed pieces. According to Lichess database black gets better results after 18... ♕d5> 18.♖xd4 ♕a5+ 19.♖d2 O-O 20.♗d6 ♖e8 <Mistake. Better move is 20... Rd8 or even 20...Nc6!? to untangle queenside pieces> 21. O-O f5 22.♕g3 fxe4 <A losing move. 22... Nc6 is the best, but after 23. Qg6 Qd8 black position looks grim.> 23.♕g6 ♖d8 24.♖f7 <Threatening mate in one> ♕c3 25.♗b4 ♕e5 26.♗g4 ♔h8 <26... ♖e8 might defend longer, but after 27.♖xg7 ♕xg7 28. ♕xe8+ ♘f8 29. ♕xc8 all black pieces are paralysed.> 27.♖xg7 ♕a1+ 28.♖d1 ♕xg7 29.♗c3 e5 30.♗xe5 ♕xe5 31.♕xh6+ ♔g8 32.♗e6+ ♕xe6 33.♕xe6+ <After this move I announced a checkmate.> ♔g7 34.♕e7+ ♔g6 35.♖d6+ ♔h5 36.♕f7+ ♔h4 37.♕f4+ ♔h5 38.♖h6#

Final position. Kill box mate with five black pieces stuck on queenside.

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