exchange sacrifice

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David Dahlem
Posts: 900
Joined: Wed Mar 08, 2006 9:06 pm

exchange sacrifice

Post by David Dahlem »

[d]r3kb1r/1b3ppp/p2ppn2/q1n5/1R1NPP2/2NBB3/1PP3PP/3Q1RK1 w kq - 0 1

Not sure if this sac is sound, but Junior 2010 likes it. And Stockfish 1.6.3s finds it after a long think.

Junior 2010:
17 00:45 44.405.330 0 +0.63 Rb4c4 Qa5d8 b2b4 Nc5xd3 c2xd3 d6d5 Qd1a4+ Nf6d7 e4xd5 e6xd5 Rc4c5 Bf8xc5 b4xc5 00 Nd4f5 Qd8f6 Qa4xd7 Qf6xc3
17 01:03 63.536.039 0 +0.94 Rb4xb7 Nc5xb7 f4f5 Nb7c5 f5xe6 Nc5xe6 Bd3c4 Ne6xd4 Qd1xd4 Bf8e7 Nc3d5 Nf6xd5 Bc4xd5 00 Bd5xa8 Rf8xa8 Rf1f5
18 01:39 99.424.581 0 +1.00 Rb4xb7 Nc5xb7 f4f5 e6e5 Nd4c6 Qa5c7 Nc6b4 Nb7c5 Nb4d5 Qc7b7 Nd5xf6+ g7xf6 Nc3d5 Bf8g7 b2b4 Nc5xd3 Qd1xd3 Ke8d8
19 02:35 150.010.037 0 +1.09 Rb4xb7 Nc5xb7 f4f5 e6e5 Nd4c6 Qa5c7 Nc6b4 Nb7c5 Nb4d5 Qc7b7 Nd5xf6+ g7xf6 Nc3d5 Bf8g7 b2b4 Nc5xd3 Qd1xd3 00 Rf1d1
20 04:44 271.072.964 0 +1.12 Rb4xb7 Nc5xb7 f4f5 e6e5 Nd4c6 Qa5c7 Nc6b4 Nb7c5 Nb4d5 Qc7b7 Nd5xf6+ g7xf6 Nc3d5 Bf8g7 Bd3c4 Ke8f8 Be3xc5 d6xc5 b2b3
21 09:10 524.682.178 0 +1.32 Rb4xb7 Nc5xb7 f4f5 e6e5 Nd4c6 Qa5c7 Nc6b4 Nb7c5 Nb4d5 Qc7c6 Nd5xf6+ g7xf6 Bd3c4 Ra8b8 Qd1h5 Rb8b7 Bc4d5 Qc6d7 Bd5xb7


Stockfish 1.6.3s:
17 00:38 32.007.598 824.003 +1.05 Rb4c4 Qa5d8 b2b4 Nc5xd3 c2xd3 Ra8c8 Qd1a4+ Qd8d7 Rc4xc8+ Bb7xc8 b4b5 Bf8e7 Rf1c1 00 Nd4c6 a6xb5 Nc3xb5 Nf6g4 Be3a7 Be7f6 h2h3 Ng4h6 Qa4a3 d6d5 Ba7c5 Rf8e8
18 00:47 39.089.551 828.396 +1.05 Rb4c4 Qa5d8 b2b4 Nc5xd3 c2xd3 Ra8c8 Qd1a4+ Qd8d7 Rc4xc8+ Bb7xc8 b4b5 Bf8e7 Rf1c1 00 b5b6 Nf6g4 Be3d2 Be7f6 Nd4f3 Qd7xa4 Nc3xa4 Bc8d7 Na4c3 Rf8b8 h2h3 Ng4h6 e4e5 d6xe5 Nf3xe5
19- 01:34 78.527.466 832.352 +0.84 Rb4c4 Qa5d8 Qd1e1 d6d5 e4xd5 Nf6xd5 f4f5 e6e5 Nd4c6 Nc5xd3 c2xd3 Bb7xc6 Rc4xc6 Qd8d7 Rc6c4 Nd5xe3 Qe1xe3 Bf8d6
20 16:04 782.592.508 811.331 +0.72 Rb4c4 Qa5d8 b2b4 Nc5xd3 c2xd3 Bf8e7 Qd1a4+ Qd8d7 Qa4xd7+ Ke8xd7 Nc3a4 Be7d8 Rf1c1 Ra8b8 Be3d2 h7h6 Nd4c6 Rb8c8 Nc6xd8 Rc8xc4 Na4b6+ Kd7xd8 Nb6xc4 Kd8e7 Nc4a5 Bb7a8 Rc1c7+ Nf6d7 Rc7a7 Rh8c8 Ra7xa6 d6d5 e4e5
21 22:31 1.099.594.815 813.413 +0.76 Rb4c4 Qa5d8 f4f5 e6e5 Nd4f3 Nc5xd3 c2xd3 Ra8c8 Qd1a4+ Qd8d7 Qa4xd7+ Ke8xd7 Rc4xc8 Bb7xc8 Nc3a4 Bf8e7 Na4b6+ Kd7d8 Nb6c4 Bc8d7 Rf1c1 Kd8e8 h2h3 Rh8f8 Be3g5 Ke8d8 Kg1f2 Bd7b5 Nc4b6 Bb5d7 Bg5d2 h7h6
22 32:52 1.618.493.227 819.133 +0.76 Rb4c4 Qa5d8 f4f5 e6e5 Nd4f3 Nc5xd3 c2xd3 Ra8c8 Qd1a4+ Qd8d7 Qa4xd7+ Ke8xd7 Rc4xc8 Bb7xc8 Nc3a4 Bf8e7 Na4b6+ Kd7d8 Nb6c4 Bc8d7 Rf1c1 Kd8e8 h2h3 Rh8f8 Be3g5 Ke8d8 Kg1f2 Bd7b5 Nc4b6 Bb5d7 Bg5d2 h7h6
22+ 33:50 1.663.772.713 819.542 +0.96 Rb4xb7 Nc5xb7 Qd1f3 Qa5h5 Qf3g3 Qh5g6 Qg3e1 Nf6g4 f4f5 Qg6h5 Qe1g3 e6e5 Nd4b3 Ng4xe3 Qg3xe3 Nb7c5 Nc3d5 Ra8b8 Nb3xc5 d6xc5 Bd3e2 Qh5h4 Nd5c7+ Ke8d8 Nc7xa6

The position comes from this game -

[Event "FRA-ch 60th"]
[Site "Clermont Ferrand"]
[Date "1985.08.28"]
[Round "11"]
[White "Bernard, Christophe"]
[Black "Grizou, Regis"]
[Result "1-0"]
[ECO "B82"]
[WhiteElo "2300"]
[BlackElo "2220"]
[Annotator "Villeneuve,A/Primel,D"]
[PlyCount "74"]
[EventDate "1985.08.17"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. f4 a6 7. Bd3 (7. Qf3 { plus agressif} 7... Qb6 8. Nb3 Qc7 9. g4 $36) 7... Nbd7 8. O-O (8. Qf3) 8... b5 ({RR} 8... Qb6 9. Be3 Qxb2 ({RR} 9... e5 10. Nf5 Qxb2 11. Qd2 Qa3 ({RR} 11... Qb4 12. Nb5 Qxd2 13. Nbxd6+ Bxd6 14. Nxd6+ Ke7 15. Nf5+ Kf8 16. Bxd2) 12. Bc4) 10. Ndb5 axb5 11. Nxb5 Ra5 ({RR} 11... Qb4 12. Nc7+ Ke7 ({RR} 12... Kd8 13. Nxa8 Qa5 14. Nb6 Nxb6 15. Qe1 Qa7 16. a4 Ng4 ({RR} 16... Nfd7 17. a5 Nc5 18. axb6 Qxb6 19. Qc3 h5 20. Rfd1 Qc7 21. Bd4 Rg8 22. Bb5 Nd7 23. Qe3 g5 24. Bxd7 gxf4 25. Qxf4 Qxd7 26. Bf6+ Ke8 27. Ra8 Qc6 28. g3 Rg4 29. Qe3 Kd7 30. Rd4 Be7 31. Bxe7 { Thesing,M (2393)-Parligras,M (2553)/Predeal 2007/EXT 2008/1/2-1/2 (38)}) 17. a5 ) 13. Nxa8 Qa5 14. e5 Ne8 15. exd6+ Nxd6 16. c4 Qxa8 17. c5 Ne8 18. f5 {RR} 18... f6 ({RR} 18... Ne5) 19. Bd4 Ne5 ({RR} 19... e5 20. Qb3 Nc7) 20. Bxe5 fxe5 21. Bc4) ({RR} 11... Kd8 12. a3 Ra4 ({RR} 12... d5 13. Rb1 Qa2 14. Rb3) 13. c4) ({RR} 11... Rb8 12. Rb1 Qxa2 13. Ra1 Qb2 14. Bd4 Qb4 15. c3) 12. Rb1 Rxb5 ({RR } 12... Qxa2 13. Nc3 Qa3 14. Rb3) 13. Rxb2 Rxb2 14. Qa1 Rb6 ({RR} 14... Rb4 15. Qc3) 15. Bxb6 Nxb6 16. Qc3 Be7 ({RR} 16... Kd8 17. Qa5 Nfd7 18. Rb1 d5 ({RR} 18... Kc7 19. Bb5 Kb8 ({RR} 19... Nc5 20. Be8) 20. Bxd7 Nxd7 21. Qd8 g6 ({RR} 21... d5 22. Kf1 dxe4 23. Rb3 Nc5 24. Rc3) 22. Kh1 Bg7 23. Qe7 Kc7 24. Rd1) 19. exd5 exd5 20. Bf5 Bc5+ 21. Kf1 Ke7 22. Bxd7 Nxd7 23. Qc7 f6 24. Rd1 d4 25. c3) 17. Rb1 Nfd7 ({RR} 17... Bd8 18. Qd4 Nbd7 19. Qxd6 Be7 20. Qc7 O-O 21. Kf1) 18. Qxg7 ({RR} 18. Qc7 O-O 19. Rxb6 Bd8 20. Qxc8 Bxb6+) 18... Bf6 19. Qh6 Ke7 ({RR } 19... Rg8 20. e5 dxe5 21. Bxh7 ({RR} 21. Rxb6 e4 22. Rxe6+ fxe6 23. Bxe4) 21... Rh8 22. Rxb6 Nxb6 ({RR} 22... e4 23. Rb4 Ke7 24. Rc4) 23. Qxf6 Rxh7 24. Qxe5 Nd5 25. c4 Ne7 26. a4) 20. Bb5 ({RR} 20. g4 Rg8 21. g5 Bg7 ({RR} 21... Bd4+ 22. Kf1 Nf8) 22. Qh4 ({RR} 22. Qxh7 Bd4+ 23. Kf1 ({RR} 23. Kh1 Rh8) 23... Rh8) 22... e5 ({RR} 22... h6 23. Kf1 hxg5 24. Qxg5+) ({RR} 22... Na4 23. Kh1 Nac5 24. g6+ Bf6 25. gxh7) 23. Kh1 exf4 24. e5 Bxe5 25. g6+ Bf6 26. gxh7 Rh8 27. Qh6) 20... Rg8 ({RR} 20... e5 21. Rf1 ({RR} 21. f5 Nc5) 21... Rg8 22. fxe5 Bxe5 23. Qxh7 Rg7 24. Qh4+ Nf6) ({RR} 20... Nc5 21. e5 dxe5 22. fxe5 Bxe5 23. Qg5+ Kd6 24. Rd1+ Nd5 25. c4) 21. Rd1 e5 ({RR} 21... Nc5 22. e5 ({RR} 22. Rxd6 Rg6) 22... dxe5 23. fxe5 Bxe5 24. Qe3 ({RR} 24. Qh4+ Bf6 25. Qb4) 24... Nbd7 ({ RR} 24... Bd6 25. Qd4 Rd8 ({RR} 25... Nd5 26. c4) 26. Qh4+ f6 27. Qxh7+ Kf8 28. Qh8+ Ke7 29. Qg7#) 25. Bxd7 Nxd7 26. Rxd7+ Bxd7 27. Qxe5 Bc6 28. g3) ({RR} 21... Rg4 22. e5 dxe5 23. Qh3 Rxf4 24. Qa3+ Ke8 25. Qc5 Bd8 26. a4) 22. f5 Nc5 ({RR} 22... Rd8 23. g4 Nc5 24. g5 Nxe4 ({RR} 24... Bh8 25. f6+) 25. gxf6+ Nxf6) ({RR} 22... Rg4 23. Qd2 d5 24. Bxd7 Nxd7 ({RR} 24... Bxd7 25. Qb4+) ({RR} 24... Kxd7 25. Qe2) 25. Qxd5) ({RR} 22... Na8 23. Bxd7 Bxd7 24. Rxd6 Bg5 ({RR} 24... Kxd6 25. Qxf6+ Kc7 26. Qxf7) 25. Qxh7) 23. Rxd6 { Anand,V (2650)-Kasparov,G (2770)/Tilburg 1991/CBM 026/[Lautier]/1-0} {RR} 23... Kxd6 24. Qxf6+ Kc7 25. Qxf7+ ({RR} 25. Qxe5+)) ({RR} 8... Be7) ({RR} 8... g6) 9. Be3 $146 ({RR} 9. a3 Bb7 10. Kh1 g6 11. Qe1 Bg7 12. f5 gxf5 13. exf5 e5 14. Bg5 O-O 15. Nb3 d5 16. Na2 Rc8 17. c3 Kh8 18. Qh4 Qb6 19. Rad1 Rg8 20. Bb1 Bf8 21. Rd2 Be7 22. Nb4 Rc4 23. Qh6 Rg7 { Smejkal,J (2545)-Adamski,J/Lugano 1968/MCD/0-1}) ({RR} 9. Nf3 Bb7 10. Qe2 Be7 11. Kh1 Nc5 12. b4 Nxd3 13. cxd3 d5 14. e5 Bxb4 15. Nxb5 axb5 16. exf6 Qxf6 17. Rb1 Bc3 18. Rxb5 Qe7 19. Be3 d4 20. Bxd4 Bxd4 21. Nxd4 O-O 22. f5 Qd7 23. Qg4 e5 {Popovych,O (2415)-Kavalek,L (2555)/New York 1972/MCD/0-1 (40)}) 9... Bb7 10. a4 $1 bxa4 (10... b4 $142 11. Na2 Nxe4 (11... e5 12. Nf5 g6 13. fxe5 Nxe5 14. Nh6 Bxh6 15. Bxh6 Qb6+ 16. Kh1 Nxe4 17. Qe1 $1 f5 18. Qxb4 (18. a5 Qd4 19. Nxb4 Qxb2 20. Nxa6 $1 Bxa6 21. Bxa6 Rxa6 (21... Ng4 $13) 22. Rb1) 18... Qxb4 19. Nxb4 Nxd3 20. cxd3 Nc5 21. Rfe1+ Kd7 $15) 12. f5 $36) 11. Rxa4 Nc5 12. Rb4 $1 {Cette manoeuvre a4,Ra4,Rb4 rapelle celle de Kasparov jouee contre Shirov en 1994 dans une B33} 12... Qa5 $6 13. Rxb7 $3 {Un joli sacrifice de qualite comme l'avait joue le Champion du Monde obligeant egalement a reprendre du N} ( 13. Rc4 $143 Nxd3 14. Qxd3) 13... Nxb7 14. b4 $6 Qc7 (14... Qxb4 $1 {les compen sations des blancs semblent insuffisantes et l'idee du sacrifice de P est assez obscure.} 15. e5 (15. Qa1 Qa5 (15... Be7 $2 16. Nc6) 16. Qxa5 (16. Qb2 Nc5 17. Ra1 Qd8) 16... Nxa5 17. Ra1 Ng4 (17... Nb7 18. Bxa6 Kd8 $1 19. Nb3 Nc5 20. Nxc5 dxc5 21. Rd1+ Kc7 $17) 18. Bd2 Nb7 19. Bb5+ Kd8) 15... Qxc3 16. exf6 d5 17. Qg4 gxf6 18. Nxe6 fxe6 19. Qxe6+ Be7 20. Qxd5 Rb8 $17) 15. Qa1 Be7 16. Qa4+ (16. f5 $5 e5 17. Qa4+ Kf8 18. Nde2) 16... Kf8 17. Nc6 Nd8 18. b5 Nxc6 19. bxc6 Rc8 20. Rb1 g6 $6 (20... Qxc6 $1 { Les noirs avaient le temps de prendre le P} 21. Qxc6 Rxc6 22. Rb8+ Ne8 23. Nb5 $1 d5 (23... axb5 24. Bxb5) 24. e5 Bc5 25. Bxc5+ Rxc5 26. Nd6 Ke7 27. Bxa6 f6 28. Nc8+ Kd7 29. Nd6 fxe5 30. fxe5 Rf8 31. Bb5+ Rxb5 32. Nxb5 Rf5) 21. Rb6 $1 Ng4 $2 {Tentant mais faux car les blancs ont assez de ressources tactiques} 22. Bd4 $1 e5 {Esperant gagner la Rb6} (22... d5 $142) 23. Nd5 (23. Bxa6 $3 exd4 24. Nd5 Qa7 25. Qxd4 Bf6 26. Nxf6 Nxf6 27. Bxc8 $18) 23... Qa7 24. h3 $2 ( 24. Qxa6 $3 {Un coup difficile a trouver puisque intuitivement le camp qui attaque souhaite naturellement garder les Q!} 24... Qxa6 25. Bxa6 Ra8 26. c7 Kg7 27. Bc3 Rhe8 28. Bb7 Ra2 29. c8=Q) 24... exd4 (24... Nf6 $142 { meilleur parceque ed4 ferme la diagonale et la Rb6 n'est plus clouee!}) 25. hxg4 Bd8 26. Rxa6 Qc5 27. c7 $1 Rxc7 (27... Bxc7 28. Rc6) 28. Nxc7 Bxc7 29. Rc6 Qa5 30. Qxd4 Rg8 31. c3 (31. Ra6 $1 Qe1+ 32. Bf1 Ke7 33. e5 $1) 31... Ke7 32. Kh2 (32. Bc4) 32... Kd7 33. Ra6 Qc5 34. Qf6 Rf8 35. e5 $2 (35. Ra4) 35... dxe5 36. Be4 Bd6 37. Rc6 Be7 {Suite illisible et gain blanc au 41eme coup, la partie s'est deja jouee en zeitnot puisqu'il manque le 40 eme coup des noirs sur la feuille de partie!} 1-0
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User avatar
michiguel
Posts: 6401
Joined: Thu Mar 09, 2006 8:30 pm
Location: Chicago, Illinois, USA

Re: exchange sacrifice

Post by michiguel »

David Dahlem wrote:[d]r3kb1r/1b3ppp/p2ppn2/q1n5/1R1NPP2/2NBB3/1PP3PP/3Q1RK1 w kq - 0 1

Not sure if this sac is sound, but Junior 2010 likes it. And Stockfish 1.6.3s finds it after a long think.

Junior 2010:
17 00:45 44.405.330 0 +0.63 Rb4c4 Qa5d8 b2b4 Nc5xd3 c2xd3 d6d5 Qd1a4+ Nf6d7 e4xd5 e6xd5 Rc4c5 Bf8xc5 b4xc5 00 Nd4f5 Qd8f6 Qa4xd7 Qf6xc3
17 01:03 63.536.039 0 +0.94 Rb4xb7 Nc5xb7 f4f5 Nb7c5 f5xe6 Nc5xe6 Bd3c4 Ne6xd4 Qd1xd4 Bf8e7 Nc3d5 Nf6xd5 Bc4xd5 00 Bd5xa8 Rf8xa8 Rf1f5
18 01:39 99.424.581 0 +1.00 Rb4xb7 Nc5xb7 f4f5 e6e5 Nd4c6 Qa5c7 Nc6b4 Nb7c5 Nb4d5 Qc7b7 Nd5xf6+ g7xf6 Nc3d5 Bf8g7 b2b4 Nc5xd3 Qd1xd3 Ke8d8
19 02:35 150.010.037 0 +1.09 Rb4xb7 Nc5xb7 f4f5 e6e5 Nd4c6 Qa5c7 Nc6b4 Nb7c5 Nb4d5 Qc7b7 Nd5xf6+ g7xf6 Nc3d5 Bf8g7 b2b4 Nc5xd3 Qd1xd3 00 Rf1d1
20 04:44 271.072.964 0 +1.12 Rb4xb7 Nc5xb7 f4f5 e6e5 Nd4c6 Qa5c7 Nc6b4 Nb7c5 Nb4d5 Qc7b7 Nd5xf6+ g7xf6 Nc3d5 Bf8g7 Bd3c4 Ke8f8 Be3xc5 d6xc5 b2b3
21 09:10 524.682.178 0 +1.32 Rb4xb7 Nc5xb7 f4f5 e6e5 Nd4c6 Qa5c7 Nc6b4 Nb7c5 Nb4d5 Qc7c6 Nd5xf6+ g7xf6 Bd3c4 Ra8b8 Qd1h5 Rb8b7 Bc4d5 Qc6d7 Bd5xb7


Stockfish 1.6.3s:
17 00:38 32.007.598 824.003 +1.05 Rb4c4 Qa5d8 b2b4 Nc5xd3 c2xd3 Ra8c8 Qd1a4+ Qd8d7 Rc4xc8+ Bb7xc8 b4b5 Bf8e7 Rf1c1 00 Nd4c6 a6xb5 Nc3xb5 Nf6g4 Be3a7 Be7f6 h2h3 Ng4h6 Qa4a3 d6d5 Ba7c5 Rf8e8
18 00:47 39.089.551 828.396 +1.05 Rb4c4 Qa5d8 b2b4 Nc5xd3 c2xd3 Ra8c8 Qd1a4+ Qd8d7 Rc4xc8+ Bb7xc8 b4b5 Bf8e7 Rf1c1 00 b5b6 Nf6g4 Be3d2 Be7f6 Nd4f3 Qd7xa4 Nc3xa4 Bc8d7 Na4c3 Rf8b8 h2h3 Ng4h6 e4e5 d6xe5 Nf3xe5
19- 01:34 78.527.466 832.352 +0.84 Rb4c4 Qa5d8 Qd1e1 d6d5 e4xd5 Nf6xd5 f4f5 e6e5 Nd4c6 Nc5xd3 c2xd3 Bb7xc6 Rc4xc6 Qd8d7 Rc6c4 Nd5xe3 Qe1xe3 Bf8d6
20 16:04 782.592.508 811.331 +0.72 Rb4c4 Qa5d8 b2b4 Nc5xd3 c2xd3 Bf8e7 Qd1a4+ Qd8d7 Qa4xd7+ Ke8xd7 Nc3a4 Be7d8 Rf1c1 Ra8b8 Be3d2 h7h6 Nd4c6 Rb8c8 Nc6xd8 Rc8xc4 Na4b6+ Kd7xd8 Nb6xc4 Kd8e7 Nc4a5 Bb7a8 Rc1c7+ Nf6d7 Rc7a7 Rh8c8 Ra7xa6 d6d5 e4e5
21 22:31 1.099.594.815 813.413 +0.76 Rb4c4 Qa5d8 f4f5 e6e5 Nd4f3 Nc5xd3 c2xd3 Ra8c8 Qd1a4+ Qd8d7 Qa4xd7+ Ke8xd7 Rc4xc8 Bb7xc8 Nc3a4 Bf8e7 Na4b6+ Kd7d8 Nb6c4 Bc8d7 Rf1c1 Kd8e8 h2h3 Rh8f8 Be3g5 Ke8d8 Kg1f2 Bd7b5 Nc4b6 Bb5d7 Bg5d2 h7h6
22 32:52 1.618.493.227 819.133 +0.76 Rb4c4 Qa5d8 f4f5 e6e5 Nd4f3 Nc5xd3 c2xd3 Ra8c8 Qd1a4+ Qd8d7 Qa4xd7+ Ke8xd7 Rc4xc8 Bb7xc8 Nc3a4 Bf8e7 Na4b6+ Kd7d8 Nb6c4 Bc8d7 Rf1c1 Kd8e8 h2h3 Rh8f8 Be3g5 Ke8d8 Kg1f2 Bd7b5 Nc4b6 Bb5d7 Bg5d2 h7h6
22+ 33:50 1.663.772.713 819.542 +0.96 Rb4xb7 Nc5xb7 Qd1f3 Qa5h5 Qf3g3 Qh5g6 Qg3e1 Nf6g4 f4f5 Qg6h5 Qe1g3 e6e5 Nd4b3 Ng4xe3 Qg3xe3 Nb7c5 Nc3d5 Ra8b8 Nb3xc5 d6xc5 Bd3e2 Qh5h4 Nd5c7+ Ke8d8 Nc7xa6

The position comes from this game -

[Event "FRA-ch 60th"]
[Site "Clermont Ferrand"]
[Date "1985.08.28"]
[Round "11"]
[White "Bernard, Christophe"]
[Black "Grizou, Regis"]
[Result "1-0"]
[ECO "B82"]
[WhiteElo "2300"]
[BlackElo "2220"]
[Annotator "Villeneuve,A/Primel,D"]
[PlyCount "74"]
[EventDate "1985.08.17"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. f4 a6 7. Bd3 (7. Qf3 { plus agressif} 7... Qb6 8. Nb3 Qc7 9. g4 $36) 7... Nbd7 8. O-O (8. Qf3) 8... b5 ({RR} 8... Qb6 9. Be3 Qxb2 ({RR} 9... e5 10. Nf5 Qxb2 11. Qd2 Qa3 ({RR} 11... Qb4 12. Nb5 Qxd2 13. Nbxd6+ Bxd6 14. Nxd6+ Ke7 15. Nf5+ Kf8 16. Bxd2) 12. Bc4) 10. Ndb5 axb5 11. Nxb5 Ra5 ({RR} 11... Qb4 12. Nc7+ Ke7 ({RR} 12... Kd8 13. Nxa8 Qa5 14. Nb6 Nxb6 15. Qe1 Qa7 16. a4 Ng4 ({RR} 16... Nfd7 17. a5 Nc5 18. axb6 Qxb6 19. Qc3 h5 20. Rfd1 Qc7 21. Bd4 Rg8 22. Bb5 Nd7 23. Qe3 g5 24. Bxd7 gxf4 25. Qxf4 Qxd7 26. Bf6+ Ke8 27. Ra8 Qc6 28. g3 Rg4 29. Qe3 Kd7 30. Rd4 Be7 31. Bxe7 { Thesing,M (2393)-Parligras,M (2553)/Predeal 2007/EXT 2008/1/2-1/2 (38)}) 17. a5 ) 13. Nxa8 Qa5 14. e5 Ne8 15. exd6+ Nxd6 16. c4 Qxa8 17. c5 Ne8 18. f5 {RR} 18... f6 ({RR} 18... Ne5) 19. Bd4 Ne5 ({RR} 19... e5 20. Qb3 Nc7) 20. Bxe5 fxe5 21. Bc4) ({RR} 11... Kd8 12. a3 Ra4 ({RR} 12... d5 13. Rb1 Qa2 14. Rb3) 13. c4) ({RR} 11... Rb8 12. Rb1 Qxa2 13. Ra1 Qb2 14. Bd4 Qb4 15. c3) 12. Rb1 Rxb5 ({RR } 12... Qxa2 13. Nc3 Qa3 14. Rb3) 13. Rxb2 Rxb2 14. Qa1 Rb6 ({RR} 14... Rb4 15. Qc3) 15. Bxb6 Nxb6 16. Qc3 Be7 ({RR} 16... Kd8 17. Qa5 Nfd7 18. Rb1 d5 ({RR} 18... Kc7 19. Bb5 Kb8 ({RR} 19... Nc5 20. Be8) 20. Bxd7 Nxd7 21. Qd8 g6 ({RR} 21... d5 22. Kf1 dxe4 23. Rb3 Nc5 24. Rc3) 22. Kh1 Bg7 23. Qe7 Kc7 24. Rd1) 19. exd5 exd5 20. Bf5 Bc5+ 21. Kf1 Ke7 22. Bxd7 Nxd7 23. Qc7 f6 24. Rd1 d4 25. c3) 17. Rb1 Nfd7 ({RR} 17... Bd8 18. Qd4 Nbd7 19. Qxd6 Be7 20. Qc7 O-O 21. Kf1) 18. Qxg7 ({RR} 18. Qc7 O-O 19. Rxb6 Bd8 20. Qxc8 Bxb6+) 18... Bf6 19. Qh6 Ke7 ({RR } 19... Rg8 20. e5 dxe5 21. Bxh7 ({RR} 21. Rxb6 e4 22. Rxe6+ fxe6 23. Bxe4) 21... Rh8 22. Rxb6 Nxb6 ({RR} 22... e4 23. Rb4 Ke7 24. Rc4) 23. Qxf6 Rxh7 24. Qxe5 Nd5 25. c4 Ne7 26. a4) 20. Bb5 ({RR} 20. g4 Rg8 21. g5 Bg7 ({RR} 21... Bd4+ 22. Kf1 Nf8) 22. Qh4 ({RR} 22. Qxh7 Bd4+ 23. Kf1 ({RR} 23. Kh1 Rh8) 23... Rh8) 22... e5 ({RR} 22... h6 23. Kf1 hxg5 24. Qxg5+) ({RR} 22... Na4 23. Kh1 Nac5 24. g6+ Bf6 25. gxh7) 23. Kh1 exf4 24. e5 Bxe5 25. g6+ Bf6 26. gxh7 Rh8 27. Qh6) 20... Rg8 ({RR} 20... e5 21. Rf1 ({RR} 21. f5 Nc5) 21... Rg8 22. fxe5 Bxe5 23. Qxh7 Rg7 24. Qh4+ Nf6) ({RR} 20... Nc5 21. e5 dxe5 22. fxe5 Bxe5 23. Qg5+ Kd6 24. Rd1+ Nd5 25. c4) 21. Rd1 e5 ({RR} 21... Nc5 22. e5 ({RR} 22. Rxd6 Rg6) 22... dxe5 23. fxe5 Bxe5 24. Qe3 ({RR} 24. Qh4+ Bf6 25. Qb4) 24... Nbd7 ({ RR} 24... Bd6 25. Qd4 Rd8 ({RR} 25... Nd5 26. c4) 26. Qh4+ f6 27. Qxh7+ Kf8 28. Qh8+ Ke7 29. Qg7#) 25. Bxd7 Nxd7 26. Rxd7+ Bxd7 27. Qxe5 Bc6 28. g3) ({RR} 21... Rg4 22. e5 dxe5 23. Qh3 Rxf4 24. Qa3+ Ke8 25. Qc5 Bd8 26. a4) 22. f5 Nc5 ({RR} 22... Rd8 23. g4 Nc5 24. g5 Nxe4 ({RR} 24... Bh8 25. f6+) 25. gxf6+ Nxf6) ({RR} 22... Rg4 23. Qd2 d5 24. Bxd7 Nxd7 ({RR} 24... Bxd7 25. Qb4+) ({RR} 24... Kxd7 25. Qe2) 25. Qxd5) ({RR} 22... Na8 23. Bxd7 Bxd7 24. Rxd6 Bg5 ({RR} 24... Kxd6 25. Qxf6+ Kc7 26. Qxf7) 25. Qxh7) 23. Rxd6 { Anand,V (2650)-Kasparov,G (2770)/Tilburg 1991/CBM 026/[Lautier]/1-0} {RR} 23... Kxd6 24. Qxf6+ Kc7 25. Qxf7+ ({RR} 25. Qxe5+)) ({RR} 8... Be7) ({RR} 8... g6) 9. Be3 $146 ({RR} 9. a3 Bb7 10. Kh1 g6 11. Qe1 Bg7 12. f5 gxf5 13. exf5 e5 14. Bg5 O-O 15. Nb3 d5 16. Na2 Rc8 17. c3 Kh8 18. Qh4 Qb6 19. Rad1 Rg8 20. Bb1 Bf8 21. Rd2 Be7 22. Nb4 Rc4 23. Qh6 Rg7 { Smejkal,J (2545)-Adamski,J/Lugano 1968/MCD/0-1}) ({RR} 9. Nf3 Bb7 10. Qe2 Be7 11. Kh1 Nc5 12. b4 Nxd3 13. cxd3 d5 14. e5 Bxb4 15. Nxb5 axb5 16. exf6 Qxf6 17. Rb1 Bc3 18. Rxb5 Qe7 19. Be3 d4 20. Bxd4 Bxd4 21. Nxd4 O-O 22. f5 Qd7 23. Qg4 e5 {Popovych,O (2415)-Kavalek,L (2555)/New York 1972/MCD/0-1 (40)}) 9... Bb7 10. a4 $1 bxa4 (10... b4 $142 11. Na2 Nxe4 (11... e5 12. Nf5 g6 13. fxe5 Nxe5 14. Nh6 Bxh6 15. Bxh6 Qb6+ 16. Kh1 Nxe4 17. Qe1 $1 f5 18. Qxb4 (18. a5 Qd4 19. Nxb4 Qxb2 20. Nxa6 $1 Bxa6 21. Bxa6 Rxa6 (21... Ng4 $13) 22. Rb1) 18... Qxb4 19. Nxb4 Nxd3 20. cxd3 Nc5 21. Rfe1+ Kd7 $15) 12. f5 $36) 11. Rxa4 Nc5 12. Rb4 $1 {Cette manoeuvre a4,Ra4,Rb4 rapelle celle de Kasparov jouee contre Shirov en 1994 dans une B33} 12... Qa5 $6 13. Rxb7 $3 {Un joli sacrifice de qualite comme l'avait joue le Champion du Monde obligeant egalement a reprendre du N} ( 13. Rc4 $143 Nxd3 14. Qxd3) 13... Nxb7 14. b4 $6 Qc7 (14... Qxb4 $1 {les compen sations des blancs semblent insuffisantes et l'idee du sacrifice de P est assez obscure.} 15. e5 (15. Qa1 Qa5 (15... Be7 $2 16. Nc6) 16. Qxa5 (16. Qb2 Nc5 17. Ra1 Qd8) 16... Nxa5 17. Ra1 Ng4 (17... Nb7 18. Bxa6 Kd8 $1 19. Nb3 Nc5 20. Nxc5 dxc5 21. Rd1+ Kc7 $17) 18. Bd2 Nb7 19. Bb5+ Kd8) 15... Qxc3 16. exf6 d5 17. Qg4 gxf6 18. Nxe6 fxe6 19. Qxe6+ Be7 20. Qxd5 Rb8 $17) 15. Qa1 Be7 16. Qa4+ (16. f5 $5 e5 17. Qa4+ Kf8 18. Nde2) 16... Kf8 17. Nc6 Nd8 18. b5 Nxc6 19. bxc6 Rc8 20. Rb1 g6 $6 (20... Qxc6 $1 { Les noirs avaient le temps de prendre le P} 21. Qxc6 Rxc6 22. Rb8+ Ne8 23. Nb5 $1 d5 (23... axb5 24. Bxb5) 24. e5 Bc5 25. Bxc5+ Rxc5 26. Nd6 Ke7 27. Bxa6 f6 28. Nc8+ Kd7 29. Nd6 fxe5 30. fxe5 Rf8 31. Bb5+ Rxb5 32. Nxb5 Rf5) 21. Rb6 $1 Ng4 $2 {Tentant mais faux car les blancs ont assez de ressources tactiques} 22. Bd4 $1 e5 {Esperant gagner la Rb6} (22... d5 $142) 23. Nd5 (23. Bxa6 $3 exd4 24. Nd5 Qa7 25. Qxd4 Bf6 26. Nxf6 Nxf6 27. Bxc8 $18) 23... Qa7 24. h3 $2 ( 24. Qxa6 $3 {Un coup difficile a trouver puisque intuitivement le camp qui attaque souhaite naturellement garder les Q!} 24... Qxa6 25. Bxa6 Ra8 26. c7 Kg7 27. Bc3 Rhe8 28. Bb7 Ra2 29. c8=Q) 24... exd4 (24... Nf6 $142 { meilleur parceque ed4 ferme la diagonale et la Rb6 n'est plus clouee!}) 25. hxg4 Bd8 26. Rxa6 Qc5 27. c7 $1 Rxc7 (27... Bxc7 28. Rc6) 28. Nxc7 Bxc7 29. Rc6 Qa5 30. Qxd4 Rg8 31. c3 (31. Ra6 $1 Qe1+ 32. Bf1 Ke7 33. e5 $1) 31... Ke7 32. Kh2 (32. Bc4) 32... Kd7 33. Ra6 Qc5 34. Qf6 Rf8 35. e5 $2 (35. Ra4) 35... dxe5 36. Be4 Bd6 37. Rc6 Be7 {Suite illisible et gain blanc au 41eme coup, la partie s'est deja jouee en zeitnot puisqu'il manque le 40 eme coup des noirs sur la feuille de partie!} 1-0
Gaviota likes it from the beginning.

Miguel

Code: Select all

       482   1:      0.0    +0.33  1.Rc4
      1463   2:      0.0    +0.25  1.Rxb7 Nxb7
      1662   3       0.0      :-)  1.Rxb7
      3679   3:      0.0    +0.99  1.Rxb7 Nxb7 2.Nc6
     10521   4:      0.0    +0.88  1.Rxb7 Nxb7 2.Nc6 Qc7
     32692   5:      0.1    +0.83  1.Rxb7 Nxb7 2.Qf3 Nc5 3.Nc6
     53533   6       0.2    +0.75  1.Rxb7 Nxb7 2.Nb3 Qd8 3.Qe2 d5 4.Bxa6
    119907   6:      0.4    +0.75  1.Rxb7 Nxb7 2.Nb3 Qd8 3.Qe2 d5 4.Bxa6
    181711   7       0.6    +1.02  1.Rxb7 Nxb7 2.f5 Qb6 3.fxe6 fxe6 4.Qa1
                                   Be7
    399626   7       1.3    +1.06  1.Rc4 Nxd3 2.cxd3 d5 3.Nc6 Bxc6 4.Rxc6
                                   Rb8
    480343   7:      1.6    +1.06  1.Rc4 Nxd3 2.cxd3 d5 3.Nc6 Bxc6 4.Rxc6
                                   Rb8
    836543   8       2.7    +1.00  1.Rc4 Nxd3 2.cxd3 Rc8 3.Rxc8+ Bxc8 4.f5
                                   h6 5.fxe6 fxe6
   1205036   8:      3.8    +1.00  1.Rc4 Nxd3 2.cxd3 Rc8 3.Rxc8+ Bxc8 4.f5
                                   h6 5.fxe6 fxe6
   1817086   9       5.8    +0.79  1.Rc4 Nxd3 2.cxd3 d5 3.exd5 Nxd5 4.Nxd5
                                   Qxd5 5.Qa4+ Qd7
   2458734   9       7.7    +1.05  1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qxh5 Nxh5 4.Ra1
                                   Nc5 5.Bb5+ Kd8 6.e5 dxe5 7.fxe5
   3014002   9:      9.5    +1.05  1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qxh5 Nxh5 4.Ra1
                                   Nc5 5.Bb5+ Kd8 6.e5 dxe5 7.fxe5
   4723395  10      14.7    +1.15  1.Rxb7 Nxb7 2.f5 exf5 3.Nxf5 Rc8 4.Bd4
                                   Nc5 5.Bxf6 Nxd3 6.Nxg7+ Bxg7 7.Qxd3
                                   Bxf6 8.Rxf6 Rxc3 9.bxc3
   6866349  10:     20.9    +1.15  1.Rxb7 Nxb7 2.f5 exf5 3.Nxf5 Rc8 4.Bd4
                                   Nc5 5.Bxf6 Nxd3 6.Nxg7+ Bxg7 7.Qxd3
                                   Bxf6 8.Rxf6 Rxc3 9.bxc3
  12251632  11      37.5    +1.00  1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qxh5 Nxh5 4.Ra1
                                   Nc5 5.Bb5+ Kd8 6.b4 Rc8 7.Be2
  21244973  11:     64.6    +1.00  1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qxh5 Nxh5 4.Ra1
                                   Nc5 5.Bb5+ Kd8 6.b4 Rc8 7.Be2
  43737507  12     133.0    +0.85  1.Rxb7 Nxb7 2.Qf3 Nd7 3.Nb3 Qd8 4.Qh3
                                   Be7 5.f5 Bg5 6.Bd4 Nbc5 7.fxe6 Nxe6
  85884092  12     261.4    +0.99  1.Rc4 Ncxe4 2.Nxe4 Bxe4 3.Bxe4 Nxe4
                                   4.Nxe6 fxe6 5.Rxe4 Qf5 6.Qd4 Kf7 7.Qd3
                                   Be7
 126207298  12:    379.4    +0.99  1.Rc4 Ncxe4 2.Nxe4 Bxe4 3.Bxe4 Nxe4
                                   4.Nxe6 fxe6 5.Rxe4 Qf5 6.Qd4 Kf7 7.Qd3
                                   Be7
 283250147  13     858.4    +1.01  1.Rc4 Qd8 2.b4 Nxd3 3.cxd3 Rc8 4.Qa4+
                                   Qd7 5.Rxc8+ Bxc8 6.Qa5 Ng4 7.Bd2 Be7
                                   8.Rc1
 342233989  13    1033.3    +1.26  1.Rxb7 Nxb7 2.f5 Nc5 3.fxe6 fxe6 4.Bc4
                                   Qb4 5.Nxe6 Nxe6 6.Bxe6 Qxb2 7.Qd3 Be7
 466826723  13:   1405.4    +1.26  1.Rxb7 Nxb7 2.f5 Nc5 3.fxe6 fxe6 4.Bc4
                                   Qb4 5.Nxe6 Nxe6 6.Bxe6 Qxb2 7.Qd3 Be7
 668590927  14    2004.4    +1.37  1.Rxb7 Nxb7 2.f5 Nc5 3.fxe6 fxe6 4.Qf3
                                   e5 5.Nb3 Qc7 6.Nxc5 dxc5 7.Bc4 Bd6
Top
yanquis1972
Posts: 1766
Joined: Wed Jun 03, 2009 12:14 am

Re: exchange sacrifice

Post by yanquis1972 »

Rybka 3 finds it & likes it pretty quickly --

[+1.04] d=18 1.Rxb7 Nxb7 2.f5 e5 3.Nc6 Qc7 4.Nb4 Nc5 5.Nbd5 Nxd5 6.Nxd5 Qb7 7.f6 g6 (0:01:16) 34057kN
[+1.00] d=17 1.Rxb7 Nxb7 2.f5 e5 3.Nc6 Qc7 4.Nb4 Nc5 5.Ncd5 Nxd5 6.Nxd5 Qc6 7.f6 g5 8.Bxg5 Rg8 9.Bc1 (0:00:47) 20766kN
[+1.00] d=16 1.Rxb7 Nxb7 2.f5 e5 3.Nc6 Qc7 4.Nb4 Nc5 5.Ncd5 Nxd5 6.Nxd5 Qc6 7.f6 g5 8.Bxg5 Rg8 9.Bc1 (0:00:38) 16948kN
[+0.83] d=16 1.Rxb7 (0:00:30) 13507kN
[+0.63] d=15 1.Rxb7 Nxb7 2.f5 e5 3.Nc6 Qc7 4.Nb4 Nc5 5.Ncd5 Nxd5 6.Nxd5 Qb7 7.f6 g6 8.b4 Nxd3 9.Qxd3 Rc8 10.c4 h5 11.Ra1 h4 (0:00:26) 11949kN
[+0.52] d=15 1.Rc4 Qd8 2.Na4 Nxa4 3.Rxa4 Be7 4.Qe2 O–O 5.Rfa1 h6 6.Nf3 Qc7 7.Bd4 Rfd8 8.e5 (0:00:20) 9053kN
[+0.60] d=14 1.Rc4 Qd8 2.f5 e5 3.Nf3 Be7 4.Bxc5 dxc5 5.Nxe5 O–O 6.Ng4 Qc7 7.Re1 Nxg4 8.Qxg4 Bf6 (0:00:05) 2518kN
[+0.77] d=13 1.Rc4 Qd8 2.f5 Qd7 3.fxe6 fxe6 4.Nf3 Nxd3 5.Qxd3 Be7 (0:00:02) 732kN
[+0.77] d=12 1.Rc4 Qd8 2.f5 Qd7 3.fxe6 fxe6 4.Nf3 Nxd3 5.cxd3 Rc8 6.Rxc8 Bxc8 7.h3 (0:00:01) 561kN
[+0.76] d=11 1.Rc4 Qd8 2.f5 Qd7 3.fxe6 fxe6 4.Nf3 Rc8 5.Bxc5 Rxc5 6.Rxc5 dxc5 7.Qe2 (0:00:01) 466kN
[+0.72] d=10 1.Rc4 Nxd3 2.Qxd3 Rc8 3.Rxc8 Bxc8 4.f5 Qb4 5.b3 Bd7 (0:00:00) 44kN
[+0.79] d=9 1.Rc4 Nxd3 2.Qxd3 Rc8 3.Rxc8 Bxc8 4.f5 Qb4 5.b3 (0:00:00) 20kN
[+0.83] d=8 1.Rc4 Nxd3 2.Qxd3 Rc8 3.Rxc8 Bxc8 4.f5 Qb4 (0:00:00) 11kN
[+0.73] d=7 1.Rc4 Nxd3 2.Qxd3 Rc8 3.Rxc8 Bxc8 4.f5 (0:00:00) 6kN
[+0.73] d=6 1.Rc4 Nxd3 2.Qxd3 Rc8 (0:00:00) 3kN
[+0.93] d=5 1.Rc4 Nxd3 (0:00:00) 2kN
[+0.75] d=4 1.Rc4 (0:00:00) 1kN
[+0.84] d=3 1.Rc4 (0:00:00) 0kN
[+0.75] d=2 1.Rc4 (0:00:00) 0kN

R3 Human is a bit slower, & dynamic likes it instantly --

[+1.23] d=15 1.Rxb7 Nxb7 2.f5 e5 3.Nc6 Qc7 4.Nb4 Nc5 5.Nbd5 Nxd5 6.Nxd5 Qc6 7.f6 g6 8.c3 Nxd3 9.Qxd3 Rc8 10.b3 Qb5 11.c4 Qb7 12.Ra1 h5 (0:00:09) 3531kN
[+1.23] d=14 1.Rxb7 Nxb7 2.f5 e5 3.Nc6 Qc7 4.Nb4 Nc5 5.Nbd5 Nxd5 6.Nxd5 Qc6 7.f6 g6 8.c3 Nxd3 9.Qxd3 Rc8 10.b3 Qb5 11.c4 Qb7 12.Ra1 h5 (0:00:08) 3151kN
[+1.22] d=14 1.Rxb7 (0:00:06) 2380kN
[+1.02] d=13 1.Rxb7 Nxb7 2.f5 e5 3.Nc6 Qc7 4.Nb4 Nc5 5.Ncd5 Qb7 6.Nxf6 gxf6 7.Nd5 Be7 8.Qg4 Rc8 9.Qg7 Rf8 (0:00:03) 1464kN
[+1.22] d=12 1.Rxb7 Nxb7 2.f5 e5 3.Nc6 Qc7 4.Nb4 Nc5 5.Ncd5 Qb7 6.Nxf6 gxf6 7.Nd5 Be7 8.Qg4 Nxd3 9.cxd3 Rc8 10.Qg7 (0:00:02) 793kN
[+1.04] d=11 1.Rxb7 Nxb7 2.f5 e5 3.Nc6 Qc7 4.Nb4 Nc5 5.Ncd5 Qb7 6.Nxf6 gxf6 7.Nd5 Be7 8.b4 (0:00:00) 74kN
[+1.04] d=10 1.Rxb7 Nxb7 2.f5 e5 3.Nc6 Qc7 4.Nb4 Nc5 5.Ncd5 Qb7 6.Nxf6 gxf6 7.Nd5 Be7 8.b4 (0:00:00) 41kN
[+1.05] d=10 1.Rxb7 (0:00:00) 35kN
[+0.85] d=9 1.Rxb7 Nxb7 2.f5 (0:00:00) 31kN
[+0.79] d=9 1.Rc4 Nxd3 2.cxd3 Rc8 3.Rxc8 Bxc8 4.f5 Qb6 5.fxe6 Bxe6 6.Qe2 (0:00:00) 19kN
[+0.92] d=8 1.Rc4 Nxd3 2.Qxd3 Rc8 3.Rxc8 Bxc8 4.f5 Ng4 (0:00:00) 6kN
[+0.92] d=7 1.Rc4 Nxd3 2.Qxd3 Rc8 3.Rxc8 Bxc8 4.f5 Ng4 (0:00:00) 6kN
[+0.92] d=6 1.Rc4 Nxd3 2.Qxd3 Rc8 3.Rxc8 Bxc8 4.f5 Ng4 (0:00:00) 6kN
[+0.92] d=5 1.Rc4 Nxd3 2.Qxd3 Rc8 3.Rxc8 Bxc8 4.f5 Ng4 (0:00:00) 6kN
[+1.00] d=4 1.Rc4 (0:00:00) 4kN
[+0.93] d=3 1.Rc4 (0:00:00) 3kN
[+1.00] d=3 1.Rc4 (0:00:00) 3kN
[+0.67] d=3 1.Rxb7 (0:00:00) 1kN
[+0.80] d=2 1.Rxb7 (0:00:00) 1kN

may be SMP luck, but Stockfish 1.6.3 (no s) sees it instantly & sticks with it 5 plies earlier than in david's post:

[+1.53] d=21 1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qg3 Qg6 4.Qe1 Ng4 5.f5 Qh5 6.h3 Nxe3 7.Qxe3 Qh6 8.Qxh6 gxh6 9.fxe6 fxe6 10.Nxe6 Kd7 11.Nd4 Nd8 12.Nd5 Ra7 13.b4 Be7 14.Be2 (0:01:11) 642000kN
[+1.09] d=20 1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qg3 Qg6 4.Qe1 Ng4 5.f5 Qh5 6.h3 Nxe3 7.Qxe3 Nc5 8.fxe6 fxe6 9.Bc4 Rc8 10.b4 e5 11.Bf7 Qxf7 12.Rxf7 Kxf7 13.Nf5 Nd7 (0:00:39) 353636kN
[+1.09] d=19 1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qg3 Nc5 4.Be2 Qg6 5.Qh3 Qh6 6.Qf3 Rb8 7.e5 Nfd7 8.f5 Nxe5 9.Qg3 (0:00:32) 297084kN
[+0.80] d=18 1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qxh5 Nxh5 4.Ra1 Be7 5.Bb5 Kd8 6.Be2 Nf6 7.e5 Nd7 8.Nc6 Ke8 9.Nb5 Rc8 10.Nba7 Rc7 11.Bxa6 dxe5 12.fxe5 Nbc5 (0:00:17) 157463kN
[+0.72] d=17 1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qxh5 Nxh5 4.Ra1 Be7 5.Bb5 Kd8 6.f5 Bf6 7.fxe6 Bxd4 8.Bxd4 fxe6 9.Be2 Nf6 10.e5 dxe5 11.Bxe5 (0:00:13) 115075kN
[+0.52] d=17 1.Rc4 Qd8 2.Nb3 Nxb3 3.cxb3 Be7 4.Bd4 d5 5.exd5 exd5 6.Ra4 O–O 7.Re1 Qc7 8.Qc2 Rfe8 (0:00:12) 103791kN
[+0.84] d=16 1.Rc4 Qd8 2.f5 e5 3.Nf3 Be7 4.Bxc5 dxc5 5.Nxe5 O–O 6.Re1 Re8 7.Ra4 Bd6 8.Nc4 Bf4 9.Kh1 (0:00:05) 36794kN
[+0.80] d=16 1.Rxb7 Nxb7 2.Nb3 Qc7 3.Be2 Be7 (0:00:04) 27071kN
[+1.01] d=15 1.Rxb7 Nxb7 2.Qf3 Nd7 3.f5 e5 4.Nc6 Qc7 5.Nb4 Nbc5 6.Nbd5 Qb7 7.Bc4 Nf6 8.Nxf6 gxf6 9.Nd5 Be7 (0:00:03) 17493kN
[+0.92] d=15 1.Rc4 Qd8 2.f5 e5 3.Nf3 Be7 4.Bxc5 dxc5 5.Nxe5 O–O 6.Ra4 Bd6 7.Ng4 Nxg4 8.Qxg4 Qf6 9.g3 Rfe8 10.Rfa1 Qh6 11.Bxa6 (0:00:02) 14614kN
[+1.01] d=14 1.Rc4 Qd8 2.f5 e5 3.Nf3 Be7 4.Bxc5 dxc5 5.Nxe5 Qc7 6.Ng4 O–O 7.Re1 Nxg4 8.Qxg4 Rfb8 9.Ra4 c4 10.Bxc4 Qb6 11.Kh1 Qxb2 (0:00:01) 7663kN
[+1.17] d=13 1.Rc4 Nxd3 2.cxd3 d5 3.b4 Qd8 4.Qa4 Nd7 5.exd5 exd5 6.Nc6 Nb6 7.Nxd8 Nxa4 8.Nxb7 dxc4 9.Nxa4 cxd3 10.Nbc5 O–O–O 11.Nxa6 Kb7 12.N4c5 Bxc5 13.Nxc5 Kc6 (0:00:01) 2636kN
[+1.41] d=12 1.Rc4 Nxd3 2.cxd3 d5 3.b4 Bxb4 4.Nb3 (0:00:01) 1528kN
[+1.17] d=11 1.Rc4 Qd8 2.Nf3 Nxd3 3.cxd3 Rc8 4.Ra4 Qd7 5.Qb3 Be7 6.Rb4 Bc6 (0:00:00) 957kN
[+1.25] d=10 1.Rc4 Qd8 2.Nf3 Nxd3 3.cxd3 Qd7 4.Ng5 h6 5.Nf3 Rc8 6.Ra4 Be7 (0:00:00) 831kN
[+1.33] d=9 1.Rc4 Qd8 2.b4 Nxd3 3.cxd3 Qd7 4.Nf3 Ng4 5.Bd4 d5 6.exd5 exd5 (0:00:00) 164kN
[+1.13] d=8 1.Rc4 Nfxe4 2.Nxe4 Nxe4 3.b4 (0:00:00) 55kN
[+0.72] d=8 1.Rxb7 Nxb7 2.e5 dxe5 3.Nc6 Qc7 4.Nxe5 Bc5 (0:00:00) 37kN
[+0.92] d=7 1.Rxb7 Nxb7 2.e5 dxe5 3.Nc6 Qc7 4.Nxe5 Bc5 (0:00:00) 25kN
[+0.92] d=6 1.Rxb7 Nxb7 2.Re1 Rc8 3.Nb3 Qb4 (0:00:00) 8kN
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metax
Posts: 344
Joined: Wed Sep 23, 2009 5:56 pm
Location: Germany

Re: exchange sacrifice

Post by metax »

Almost like Gaviota, it dithers between Rc4 and Rxb7, but seems to rather like Rc4 although I did not let it search very deep (every time Rxb7 becomes the PV, it fails low on the next ply):

Code: Select all

FEN: r3kb1r/1b3ppp/p2ppn2/q1n5/1R1NPP2/2NBB3/1PP3PP/3Q1RK1 w kq - 0 1 

ChessMind:
  1/16	00:00	           0	0	+0,34	Tb4c4 Lb7xe4
  2/16	00:00	       5.066	35.000	+0,34	Tb4c4 Sf6xe4 Sd4b3
  2/16	00:00	       5.066	35.000	+0,43	Tb4xb7 Sc5xb7 Sd4c6
  3/16	00:00	      24.300	110.000	+0,02	Tb4xb7 Sc5xb7 f4f5 Da5c7
  3/18	00:00	      24.300	110.000	+0,26	Tb4c4 Sf6xe4 Sc3xe4 Sc5xe4
  4/19	00:00	      59.922	159.000	+0,60	Tb4c4 Sc5xe4 Sc3xe4 Lb7xe4 Ld3xe4
  4/19	00:00	      59.922	159.000	+0,66	Tb4xb7 Sc5xb7 e4e5 d6xe5 f4xe5
  5/20	00:01	     124.832	185.000	+0,15	Tb4xb7 Sc5xb7 e4e5 d6xe5 Sd4c6 Da5c7
  5/21	00:01	     124.832	185.000	+0,47	Tb4c4 Sc5xe4 Sc3xe4 Sf6xe4 Sd4c6 Lb7xc6
  6/21	00:02	     321.835	210.000	+0,17	Tb4c4 Sf6xe4 Sc3xe4 Sc5xe4 Sd4b3 Da5f5 Tc4c7
  6/21	00:02	     321.835	210.000	+0,41	Tb4xb7 Sc5xb7 Sd4b3 Da5c7 Dd1e2 Dc7c6 e4e5
  7/24	00:04	   1.017.294	226.000	+0,29	Tb4xb7 Sc5xb7 Sd4b3 Da5c7 Dd1e2 Sb7c5 Sb3xc5 d6xc5
  7/25	00:07	   1.621.219	225.000	+0,66	Tb4c4 Da5d8 Sd4b3 Sc5xb3 c2xb3 d6d5 e4xd5 Lb7xd5
  8/27	00:15	   3.391.215	229.000	+0,85	Tb4c4 Da5d8 Tf1e1 Ta8c8 e4e5 Sf6d5 e5xd6 Lf8xd6 Tc4xc5
  9/28	00:23	   5.247.889	226.000	+0,71	Tb4c4 Da5d8 Tf1e1 Ta8c8 e4e5 Sf6d5 e5xd6 Lf8xd6 Sc3xd5 Lb7xd5
 10/30	00:41	   9.354.488	227.000	+0,77	Tb4c4 Da5d8 Tf1e1 Ta8c8 Le3f2 Lf8e7 e4e5 Sf6d5 Dd1g4 Sc5xd3 Tc4xc8
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David Dahlem
Posts: 900
Joined: Wed Mar 08, 2006 9:06 pm

Re: exchange sacrifice

Post by David Dahlem »

What is White's best move after 1.Rxb7 Nxb7?

[d]r3kb1r/1n3ppp/p2ppn2/q7/3NPP2/2NBB3/1PP3PP/3Q1RK1 w kq - 0 2

I see some engines like f5 and some like Qf3. The original human move was b4?!.
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Eelco de Groot
Posts: 4663
Joined: Sun Mar 12, 2006 2:40 am
Full name:   Eelco de Groot

Re: exchange sacrifice

Post by Eelco de Groot »

I think there is probably more than one good move for White. Rainbow Serpent would do 2. Qf3 after an overnight search. But as first move there may also be more than one move.


[d]r3kb1r/1b3ppp/p2ppn2/q1n5/1R1NPP2/2NBB3/1PP3PP/3Q1RK1 w kq -

Engine: Rainbow Serpent 1.6.3s(dc) Build 164 (Athlon 2009 MHz, 256 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit

1.00 0:03 +1.85 1.Rxb7 (449) 0

2.01 0:04 +1.29 1.Rxb7 Nxb7 2.Nc6 (1.101) 0

3.01 0:05 +2.14 1.Rxb7 Nxb7 2.Nc6 Qc7 3.Re1 Qxc6 (4.037) 0

4.01 0:06 +0.72 1.Rxb7 Nxb7 2.Nc6 Qc7 3.Nb4 (12.914) 1

5.01 0:07 +1.13 1.Rxb7 Nxb7 2.Nc6 Qc7 3.Nb4 Nc5 (23.286) 3

5.02 0:07 +1.29 1.Rc4 Ncxe4 2.Nxe4 Bxe4 3.Bxe4 Nxe4
4.Nxe6 fxe6 5.Rxe4 Qf5 (29.063) 4

6.01 0:08 +1.29 1.Rc4 Ncxe4 2.Nxe4 Bxe4 3.Bxe4 Nxe4
4.Nxe6 fxe6 5.Rxe4 Qa2 6.Re1 (57.186) 6

7.01 0:09 +1.85++ 1.Rc4 Nxd3 2.cxd3 Nd7 3.Nb3 (98.692) 10

8.01 0:14 +1.25 1.Rc4 Qd8 2.f5 e5 3.Nf3 Nxd3 4.cxd3 Qd7
5.d4 (721.984) 48

9.01 0:18 +1.53 1.Rc4 Qd8 2.f5 e5 3.Nf3 Nxd3 4.cxd3 Ng4
5.Bg5 Be7 6.Qa4+ Kf8 7.Rb4 Kg8
8.Rxb7 Bxg5 9.Nxg5 Qxg5 (2.614.381) 138

10.01 0:20 +1.41 1.Rc4 Qd8 2.f5 e5 3.Nf3 Nxd3 4.cxd3 Qd7
5.Bb6 Bc6 6.d4 Qb7 7.Qb3 Nxe4 8.dxe5 Nxc3
9.Rxc3 Rb8 (3.479.909) 167

11.01 0:24 +1.29 1.Rc4 Qd8 2.f5 e5 3.Nf3 Nxd3 4.cxd3 Qd7
5.Bb6 Bc6 6.d4 Qb7 7.Qb3 Nd7 8.d5 Qxb6+
9.Qxb6 Nxb6 10.Rxc6 Nd7 11.Nd2 Rb8
12.Nc4 a5 13.Nxa5 Rxb2 14.Nc4 (5.093.085) 210

12.01 0:36 +1.65++ 1.Rc4 Nxd3 2.cxd3 d5 3.Qb3 Rb8
4.exd5 exd5 5.Ra4 (10.948.000) 297

13.01 0:52 +1.13 1.Rc4 Qd8 2.f5 e5 3.Nf3 Nxd3 4.cxd3 Qd7
5.Bb6 Bc6 6.Qb3 Be7 7.Rxc6 Qxc6 (18.186.140) 345

14.01 2:49 +0.96 1.Rc4 Qd8 2.f5 e5 3.Nf3 Be7 4.Bxc5 dxc5
5.Nxe5 O-O 6.Re1 Bd6 7.Nf3 Qb8 8.Qe2 Ng4
9.e5 Bxf3 10.Qxf3 Nxe5 (73.258.499) 432

15.01 11:04 +0.64 1.Rc4 Qd8 2.f5 e5 3.Nf3 Be7 4.Bxc5 dxc5
5.Nxe5 O-O 6.Re1 Bd6 7.Nf3 Re8 8.b3 Qc7
9.h3 Bc6 10.Re2 Bb5 11.e5 Bxe5
12.Nxe5 Rxe5 13.Rxe5 Qxe5 (298.298.388) 448

15.02 11:37 +1.41 1.Rxb7 Nxb7 2.h3 Nc5 3.e5 Nfd7 4.f5 Nxe5
5.fxe6 fxe6 6.Qh5+ Kd7 7.Bf4 Kc8
8.Bxe5 dxe5 9.Qf3 Rb8 10.Qc6+ Qc7
11.Bxa6+ Nxa6 12.Qxa6+ Qb7 13.Qxe6+ Qd7
14.Qxe5 (313.124.277) 449

16.01 21:14 +1.05 1.Rxb7 Nxb7 2.Nb3 Qc7 3.Qf3 h5 4.e5 Nd7
5.exd6 Bxd6 6.Ra1 Kf8 7.Ne4 Be7
8.Nd4 Nf6 9.Ng5 Kg8 10.Nc6 (602.024.177) 472

17.01 39:50 +1.13 1.Rxb7 Nxb7 2.Nb3 Qc7 3.Qf3 Qc8
4.Na4 Qc7 5.Nb6 Rb8 6.e5 Nd8 7.exf6 Rxb6
8.f5 e5 9.fxg7 Bxg7 10.Bxb6 Qxb6+
11.Qf2 Qxf2+ 12.Kxf2 Nc6 13.Bxa6 Ke7 (1.144.619.021) 478

17.02 49:50 +2.10 1.Rc4 Ncd7 2.Qf3 Be7 3.Qg3 g6 4.e5 Nh5
5.Qh3 dxe5 6.Ra4 Qd8 7.fxe5 O-O 8.g4 Nxe5
9.gxh5 (1.424.915.560) 476

18.01 62:36 +2.02 1.Rc4 Ncd7 2.Qf3 Be7 3.Qg3 g6 4.e5 Nh5
5.Qh3 dxe5 6.fxe5 Qxe5 7.Nb3 Qb8
8.Rd4 f5 9.Bc4 Qe5 10.Rfd1 O-O-O
11.R4d2 Rhe8 (1.794.406.731) 477

19.01 131:52 +1.61 1.Rc4 Ncd7 2.Qf3 Be7 3.Qg3 g6 4.e5 dxe5
5.fxe5 Nh5 6.Qh3 Qxe5 7.g4 Nhf6
8.Nb3 Bd8 9.Rb4 Nd5 10.Nxd5 Qxd5
11.Be4 Qxe4 12.Rxe4 Bxe4 13.Qh6 f5
14.Rd1 (3.787.979.567) 478

19.02 140:41 +2.06 1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qg3 Nc5
4.Be2 Ncxe4 5.Nxe4 Nxe4 6.Bxh5 Nxg3
7.hxg3 Rc8 8.c3 g6 9.Be2 Ra8 10.Ra1 Bg7
11.Bxa6 Ke7 12.Kf2 Bxd4 13.Bxd4 Rhc8
14.Kf3 (4.045.154.722) 479

20.01 371:31 +2.26++ 1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qg3 Nc5
4.Be2 Ncxe4 5.Nxe4 Nxe4 6.Bxh5 Nxg3
7.hxg3 Rc8 8.c3 g6 9.Be2 Ra8 10.Ra1 Bg7
11.Bxa6 Ke7 (10.960.113.240) 491

21.01 384:04 +2.30 1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qg3 Nc5
4.Be2 Ncxe4 5.Nxe4 Nxe4 6.Bxh5 Nxg3
7.hxg3 Rc8 8.c3 Rb8 9.Rb1 g6 10.Be2 Kd7
11.Bxa6 Bg7 12.Bb5+ Kc7 13.c4 Ra8
14.Kf2 (11.330.571.774) 491

best move: Rb4xb7 time: 409:57.062 min n/s: 494.507 nodes: 12.163.410.211
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: exchange sacrifice

Post by zullil »

David Dahlem wrote:[d]r3kb1r/1b3ppp/p2ppn2/q1n5/1R1NPP2/2NBB3/1PP3PP/3Q1RK1 w kq - 0 1

Not sure if this sac is sound, but Junior 2010 likes it. And Stockfish 1.6.3s finds it after a long think.
The new Crafty-23.2 settles on the sac in just a minute-and-a-half (at 26.3M nps :wink:).

Code: Select all

Crafty v23.2 (8 cpus)

White(1): setboard r3kb1r/1b3ppp/p2ppn2/q1n5/1R1NPP2/2NBB3/1PP3PP/3Q1RK1 w kq - 0 1
White(1): st 600
search time set to 600.00.
White(1): display stats
display statistics at end of each search.
White(1): display

       +---+---+---+---+---+---+---+---+
    8  |<R>| . |   | . |<K>|<B>|   |<R>|
       +---+---+---+---+---+---+---+---+
    7  | . |<B>| . |   | . |<P>|<P>|<P>|
       +---+---+---+---+---+---+---+---+
    6  |<P>| . |   |<P>|<P>|<N>|   | . |
       +---+---+---+---+---+---+---+---+
    5  |<Q>|   |<N>|   | . |   | . |   |
       +---+---+---+---+---+---+---+---+
    4  |   |-R-|   |-N-|-P-|-P-|   | . |
       +---+---+---+---+---+---+---+---+
    3  | . |   |-N-|-B-|-B-|   | . |   |
       +---+---+---+---+---+---+---+---+
    2  |   |-P-|-P-| . |   | . |-P-|-P-|
       +---+---+---+---+---+---+---+---+
    1  | . |   | . |-Q-| . |-R-|-K-|   |
       +---+---+---+---+---+---+---+---+
         a   b   c   d   e   f   g   h

White(1): go
              time limit 10:00 (+0.00) (10:00)
              depth   time  score   variation (1)
starting thread 1
starting thread 2
starting thread 3
starting thread 4
starting thread 5
starting thread 6
starting thread 7
                8->   0.03   0.88   1. Rc4 Nxd3 2. Qxd3 Rb8 3. f5 Qe5 4.
                                    Nf3 Qa5 5. fxe6 fxe6
                9     0.04   0.76   1. Rc4 Nxd3 2. Qxd3 Rb8 3. f5 e5 4.
                                    Nb3 Qd8 5. Rd1
                9->   0.04   0.76   1. Rc4 Nxd3 2. Qxd3 Rb8 3. f5 e5 4.
                                    Nb3 Qd8 5. Rd1
               10     0.06   0.72   1. Rc4 Nxd3 2. Qxd3 Rb8 3. f5 e5 4.
                                    Ra4 Qd8 5. Nf3 Be7
               10->   0.06   0.72   1. Rc4 Nxd3 2. Qxd3 Rb8 3. f5 e5 4.
                                    Ra4 Qd8 5. Nf3 Be7
               11     0.19   0.67   1. Rc4 Qd8 2. Qe2 Nxd3 3. Qxd3 Rc8
                                    4. Rxc8 Qxc8 5. f5 Be7 6. fxe6 fxe6
               11->   0.20   0.67   1. Rc4 Qd8 2. Qe2 Nxd3 3. Qxd3 Rc8
                                    4. Rxc8 Qxc8 5. f5 Be7 6. fxe6 fxe6
               12     0.31   0.62   1. Rc4 Qd8 2. b4 Nxd3 3. cxd3 Rc8 4.
                                    f5 Qd7 5. fxe6 fxe6 6. Rxc8+ Qxc8 7.
                                    Qa4+ Qd7 <HT>
               12->   0.33   0.62   1. Rc4 Qd8 2. b4 Nxd3 3. cxd3 Rc8 4.
                                    f5 Qd7 5. fxe6 fxe6 6. Rxc8+ Qxc8 7.
                                    Qa4+ Qd7 <HT>
               13     0.46   0.61   1. Rc4 Qd8 2. b4 Nxd3 3. cxd3 Rc8 4.
                                    e5 d5 5. Rxc8 Qxc8 6. exf6 Qxc3 7.
                                    Qa4+ Kd8
               13->   0.52   0.61   1. Rc4 Qd8 2. b4 Nxd3 3. cxd3 Rc8 4.
                                    e5 d5 5. Rxc8 Qxc8 6. exf6 Qxc3 7.
                                    Qa4+ Kd8
               14     0.91   0.59   1. Rc4 Qd8 2. b4 Nxd3 3. cxd3 Rc8 4.
                                    Qa4+ Qd7 5. Rxc8+ Bxc8 6. b5 d5 7.
                                    f5 axb5 8. Ndxb5 e5
               14->   1.05   0.59   1. Rc4 Qd8 2. b4 Nxd3 3. cxd3 Rc8 4.
                                    Qa4+ Qd7 5. Rxc8+ Bxc8 6. b5 d5 7.
                                    f5 axb5 8. Ndxb5 e5
               15     2.22   0.56   1. Rc4 Qd8 2. Nb3 Nxd3 3. Qxd3 Ng4
                                    4. Rb4 Nxe3 5. Qxe3 Qc7 6. Na5 Bc8
                                    7. Ra4 Rb8 8. Nc4
               15->   2.52   0.56   1. Rc4 Qd8 2. Nb3 Nxd3 3. Qxd3 Ng4
                                    4. Rb4 Nxe3 5. Qxe3 Qc7 6. Na5 Bc8
                                    7. Ra4 Rb8 8. Nc4
               16     3.69   0.48   1. Rc4 Qd8 2. Nb3 Nxb3 3. cxb3 d5 4.
                                    exd5 Nxd5 5. Nxd5 Bxd5 6. Rc1 Bb4 7.
                                    Qg4 O-O 8. Bd4 f6
               16->   4.46   0.48   1. Rc4 Qd8 2. Nb3 Nxb3 3. cxb3 d5 4.
                                    exd5 Nxd5 5. Nxd5 Bxd5 6. Rc1 Bb4 7.
                                    Qg4 O-O 8. Bd4 f6
               17     7.27   0.47   1. Rc4 Qd8 2. Nb3 Nxb3 3. cxb3 Be7
                                    4. Qe2 O-O 5. e5 Nd5 6. Bd4 Rc8 7.
                                    Rxc8 Qxc8 8. Nxd5 Bxd5 9. Bxa6
               17->   8.84   0.47   1. Rc4 Qd8 2. Nb3 Nxb3 3. cxb3 Be7
                                    4. Qe2 O-O 5. e5 Nd5 6. Bd4 Rc8 7.
                                    Rxc8 Qxc8 8. Nxd5 Bxd5 9. Bxa6
               18    14.48   0.53   1. Rc4 Qd8 2. Nb3 Nxd3 3. Qxd3 Be7
                                    4. Ra4 O-O 5. Na5 Qc7 6. Nxb7 Qxb7
                                    7. b3 a5 8. Bd4 Kh8 9. Rfa1 Qc7
               18->  16.91   0.53   1. Rc4 Qd8 2. Nb3 Nxd3 3. Qxd3 Be7
                                    4. Ra4 O-O 5. Na5 Qc7 6. Nxb7 Qxb7
                                    7. b3 a5 8. Bd4 Kh8 9. Rfa1 Qc7
               19    40.30   0.38   1. Rc4 Qd8 2. b4 Nxd3 3. cxd3 Be7 4.
                                    Nc6 Bxc6 5. Rxc6 O-O 6. Bb6 Qb8 7.
                                    Qa4 Rc8 8. Rxc8+ Qxc8 9. Rc1 Rb8 10.
                                    Bd4 Qc7
               19->   1:03   0.38   1. Rc4 Qd8 2. b4 Nxd3 3. cxd3 Be7 4.
                                    Nc6 Bxc6 5. Rxc6 O-O 6. Bb6 Qb8 7.
                                    Qa4 Rc8 8. Rxc8+ Qxc8 9. Rc1 Rb8 10.
                                    Bd4 Qc7 (s=2)
               20     1:22   0.38   1. Rc4 Qd8 2. b4 Nxd3 3. cxd3 Be7 4.
                                    Qa4+ Qd7 5. Rc1 Qxa4 6. Nxa4 Rb8 7.
                                    Nc6 Bxc6 8. Rxc6 Rxb4 9. Rxa6 O-O 10.
                                    Ra7 Rfb8 11. Nb6
               20     1:32   0.49   1. Rxb7 Nxb7 2. Qf3 Nd7 3. e5 d5 4.
                                    f5 Nxe5 5. Qg3 Bd6 6. fxe6 O-O 7. exf7+
                                    Nxf7 8. Qh3 Nh6 9. Bxh6 Rxf1+ 10. Bxf1
                                    gxh6 11. Qe6+ Kh8 12. Nxd5
               20->   1:43   0.49   1. Rxb7 Nxb7 2. Qf3 Nd7 3. e5 d5 4.
                                    f5 Nxe5 5. Qg3 Bd6 6. fxe6 O-O 7. exf7+
                                    Nxf7 8. Qh3 Nh6 9. Bxh6 Rxf1+ 10. Bxf1
                                    gxh6 11. Qe6+ Kh8 12. Nxd5 (s=2)
               21     2:17   0.53   1. Rxb7 Nxb7 2. Qf3 Qh5 3. Qxh5 Nxh5
                                    4. Ra1 Nf6 5. Bxa6 Kd8 6. b4 Ng4 7.
                                    Bd2 Be7 8. Nc6+ Kd7 9. Nxe7 Kxe7 10.
                                    Ra4 Rhb8 11. b5 Nc5
               21->   3:00   0.53   1. Rxb7 Nxb7 2. Qf3 Qh5 3. Qxh5 Nxh5
                                    4. Ra1 Nf6 5. Bxa6 Kd8 6. b4 Ng4 7.
                                    Bd2 Be7 8. Nc6+ Kd7 9. Nxe7 Kxe7 10.
                                    Ra4 Rhb8 11. b5 Nc5 (s=2)
               22     3:27   0.50   1. Rxb7 Nxb7 2. Qf3 Qh5 3. Qxh5 Nxh5
                                    4. Ra1 Nf6 5. Bxa6 Kd8 6. b4 Ng4 7.
                                    Bd2 Be7 8. Nc6+ Kd7 9. Nxe7 Kxe7 10.
                                    Ra4 Rhb8 11. Bc4 Rxa4 12. Nxa4
               22->   5:54   0.50   1. Rxb7 Nxb7 2. Qf3 Qh5 3. Qxh5 Nxh5
                                    4. Ra1 Nf6 5. Bxa6 Kd8 6. b4 Ng4 7.
                                    Bd2 Be7 8. Nc6+ Kd7 9. Nxe7 Kxe7 10.
                                    Ra4 Rhb8 11. Bc4 Rxa4 12. Nxa4 (s=3)
               23     7:00   0.56   1. Rxb7 Nxb7 2. Qf3 Qh5 3. Qxh5 Nxh5
                                    4. Ra1 Nf6 5. Bxa6 Kd8 6. b4 Ng4 7.
                                    Bd2 Be7 8. Nc6+ Kd7 9. Nxe7 Kxe7 10.
                                    Ra4 Rhb8 11. Ra2 Nf6 12. Be3 h5 (s=2)
              time=10:00  mat=0  n=15770655518  fh=92%  nps=26.3M     
              extensions=545.9M qchecks=544.2M reduced=1520.0M pruned=2478.8M
              predicted=0  evals=2909.3M  50move=0  EGTBprobes=0  hits=0
              SMP->  splits=1144297  aborts=131461  data=71/1024  elap=10:00
terminating SMP processes.
White(1): Rxb7
              time used:  10:00
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User avatar
Eelco de Groot
Posts: 4663
Joined: Sun Mar 12, 2006 2:40 am
Full name:   Eelco de Groot

Re: exchange sacrifice

Post by Eelco de Groot »

Eelco de Groot wrote:I think there is probably more than one good move for White. Rainbow Serpent would do 2. Qf3 after an overnight search. But as first move there may also be more than one move.

This is with an alternative version:


[d]r3kb1r/1b3ppp/p2ppn2/q1n5/1R1NPP2/2NBB3/1PP3PP/3Q1RK1 w kq -

Engine: Rainbow Serpent 1.6.3s(dc) Build 165 (Athlon 2009 MHz, 256 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit

1.00 0:00 +1.85 1.Rxb7 (449) 1

2.00 0:00 +1.29 1.Rxb7 Nxb7 2.Nc6 (1.101) 3

3.00 0:00 +2.14 1.Rxb7 Nxb7 2.Nc6 Qh5 (4.045) 12

4.00 0:00 +0.72 1.Rxb7 Nxb7 2.Nc6 Qc7 3.Nb4 (12.959) 39

5.00 0:00 +1.13 1.Rxb7 Nxb7 2.Nc6 Qc7 3.Nb4 Nc5
4.Bb5+ axb5 (22.873) 63

5.00 0:00 +1.29 1.Rc4 Ncxe4 2.Nxe4 Bxe4 3.Bxe4 Nxe4
4.Nxe6 fxe6 5.Rxe4 Kf7 (52.944) 125

6.00 0:00 +1.29 1.Rc4 Ncxe4 2.Nxe4 Bxe4 3.Bxe4 Nxe4
4.Nxe6 fxe6 5.Rxe4 Qf5 6.Qd4 g6 (125.798) 211

7.01 0:04 +1.33 1.Rc4 Qd8 2.f5 Qd7 3.fxe6 fxe6 4.Bf4 Nfxe4
5.Nxe4 Nxe4 6.Bxe4 Bxe4 7.Bg5 (1.794.952) 420

8.01 0:04 +1.37 1.Rc4 Qd8 2.f5 Qd7 3.fxe6 fxe6 4.Be2 Be7
5.Bg4 O-O 6.b4 Nxg4 7.Rxf8+ Bxf8
8.Qxg4 (1.912.840) 422

9.01 0:07 +1.17-- 1.Rc4 Nxd3 2.cxd3 d5 3.Qb3 Rb8 4.Ra4 Qc7 (3.105.396) 443

10.01 0:12 +1.29 1.Rc4 Nxd3 2.cxd3 d5 3.Nc6 Qc7
4.exd5 exd5 5.Re1 Be7 6.Nxe7 dxc4
7.Ned5 Nxd5 8.Bb6+ Qe7 9.Qa4+ Kf8
10.Rxe7 Nxe7 11.dxc4 (5.585.467) 456

11.01 0:27 +1.21 1.Rc4 Qd8 2.f5 Qd7 3.fxe6 fxe6 4.Be2 Be7
5.Bg4 O-O 6.Rxc5 Nxg4 7.Qxg4 Rxf1+
8.Kxf1 dxc5 9.Nxe6 g6 10.Kg1 Kh8 (13.215.611) 476

12.01 0:45 +1.45 1.Rc4 Qd8 2.f5 e5 3.Nf3 Nxd3 4.cxd3 Ng4
5.Bg5 Be7 6.Qa4+ Kf8 7.Rb4 Bxg5
8.Nxg5 Qxg5 9.Rxb7 Qe3+ 10.Kh1 Qxd3 (22.107.386) 485

13.01 2:05 +1.41 1.Rc4 Qd8 2.f5 e5 3.Nf3 Nxd3 4.cxd3 Ng4
5.Bg5 Be7 6.Qa4+ Kf8 7.Bxe7+ Qxe7
8.Re1 Rc8 9.Rxc8+ Bxc8 10.Nd5 Qa7+
11.d4 Qd7 12.Qc4 (62.026.855) 496

14.01 3:56 +1.09-- 1.Rc4 Qd8 2.f5 e5 3.Nf3 Be7 4.Bxc5 dxc5
5.Nxe5 O-O 6.Na4 Bd6 7.Nxc5 Bxe5
8.Nxb7 Qb6+ (117.247.464) 494

14.02 4:11 +1.33 1.Rxb7 Nxb7 2.e5 dxe5 3.Nb3 Qc7
4.fxe5 Nd7 5.Be4 Rb8 6.Ba7 Rd8 7.Bd4 Bc5
8.Qg4 Bxd4+ 9.Nxd4 O-O 10.Nc6 Nxe5
11.Nxe5 Qc5+ 12.Rf2 Qxe5 13.Bxb7 (124.546.361) 495

15.01 4:47 +1.13-- 1.Rxb7 Nxb7 2.Nb3 Qc7 3.e5 dxe5
4.fxe5 Nd7 5.Be4 Rb8 6.Ba7 Rd8 7.Bd4 Bc5
8.Qg4 Bxd4+ 9.Nxd4 O-O 10.Nc6 Kh8
11.Nxd8 Nxd8 12.Qh5 g6 (143.177.841) 497

16.01 13:21 +1.17 1.Rxb7 Nxb7 2.Nb3 Qc7 3.Qf3 h5 4.Ra1 Be7
5.e5 dxe5 6.fxe5 Ng4 7.Bd4 O-O 8.h3 Nxe5
9.Bxe5 Qxe5 10.Qxb7 Bd6 (389.287.849) 485

16.02 17:19 +1.65 1.Rc4 Qd8 2.e5 Nd5 3.Nxd5 Bxd5 4.f5 Nxd3
5.cxd3 exf5 6.Bg5 Be7 7.Bxe7 Qxe7
8.Nxf5 Qa7+ 9.Rd4 O-O-O 10.exd6 Kb8
11.Qg4 f6 12.Ne7 (502.625.312) 483

17.01 37:03 +1.53 1.Rc4 Qd8 2.e5 Nd5 3.Nxd5 Bxd5 4.f5 Nxd3
5.cxd3 Be7 6.fxe6 O-O 7.exf7+ Bxf7
8.e6 Bg6 9.Rxf8+ Qxf8 10.Rc7 Rc8
11.Rd7 Bf6 12.Qg4 Re8 13.Ne2 Bxb2
14.Nf4 (1.101.700.211) 495

18.01 58:49 +1.73 1.Rc4 Qd8 2.e5 Nd5 3.Nxd5 Bxd5 4.f5 Nxd3
5.cxd3 Be7 6.fxe6 O-O 7.exf7+ Bxf7
8.e6 Bg6 9.Nc6 Qe8 10.Rxf8+ Bxf8
11.Nd4 d5 12.Rc6 Qb8 13.Nf3 Be8
14.Rb6 (1.733.935.067) 491

18.02 65:56 +2.26 1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qg3 Qg6
4.Qe1 Ng4 5.f5 Qh5 6.h3 Nxe3 7.Qxe3 e5
8.Nd5 Qh6 9.Nc7+ Kd7 10.Qxh6 gxh6
11.Nxa8 exd4 12.Bxa6 Nc5 13.Bb5+ Kd8
14.Ra1 (1.938.666.280) 489

19.01 120:58 +2.50 1.Rxb7 Nxb7 2.Qf3 Qh5 3.Qg3 Ng4
4.Be2 Qxh2+ 5.Qxh2 Nxh2 6.Kxh2 Nc5
7.b4 Nd7 8.Ra1 Be7 9.Bxa6 O-O 10.Kg3 Bf6
11.Ra5 Bd8 12.Ra2 Bb6 13.Kf3 e5
14.Nc6 (3.639.888.110) 501

best move: Rb4xb7 time: 125:16.922 min n/s: 501.546 nodes: 3.770.070.318

As skating coach Henk Gemser would say in a chloresterol lowering butter commercial: "Dat kan beter!", "This could be improved!" :)

Next version on the drawing board!
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
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