Monster move: 1...Nc3+!!

[Vinvin]

Houdini 1.5 32 bits, 2 threads Intel 3.1 Ghz
Found after 2h35m, still running ...

FEN: 1rr3k1/3b1pq1/4p2p/1n1pP2P/2P2QP1/1p6/1P6/1K1RNB1R b - - 0 1

Houdini_15_w32:
...
25/76+ 37:38 6.630.241.216 2.936.000 +0,91 Dg7-f8
25/76 39:41 7.013.638.743 2.944.000 +0,78 Dg7-f8 Th1-h3 Cb5-a3+ b2xa3 Tb8-a8 Th3xb3 Fd7-a4 Tb3-c3 Fa4xd1 Rb1-c1 Ta8xa3 Tc3xa3 Df8xa3+ Rc1xd1 Da3-a1+ Df4-c1 Da1xe5 c4-c5 De5-d4+ Ce1-d3 Dd4xg4+ Ff1-e2 Dg4-g1+ Rd1-c2 Dg1xc1+ Rc2xc1 f7-f6 Rc1-d2 Rg8-f7 Fe2-g4 Rf7-e7 Rd2-e3 Tc8-a8 Cd3-b4 Ta8-a3+ Re3-d4 Ta3-a4 Rd4-c3 f6-f5 Fg4-d1 Ta4-a1 Cb4-c6+ Re7-d7 Cc6-e5+ Rd7-c7
26/76+ 55:22 9.948.281.962 2.994.000 +0,87 Dg7-f8
26/76 58:26 10.518.827.434 3.000.000 +0,86 Dg7-f8 Th1-h3 Cb5-a3+ b2xa3 Tb8-a8 Th3xb3 Fd7-a4 Tb3-c3 Fa4xd1 Rb1-c1 Ta8xa3 Tc3xa3 Df8xa3+ Rc1xd1 Da3-a1+ Df4-c1 Da1xe5 c4-c5 De5-d4+ Ce1-d3 Dd4xg4+ Ff1-e2 Dg4-g1+ Rd1-c2 Dg1xc1+ Rc2xc1 f7-f6 Fe2-d1 Rg8-f7 Fd1-b3 Tc8-g8 Cd3-f4 f6-f5 Rc1-d2 Rf7-f6 Cf4-d3 Tg8-b8 Rd2-c3 d5-d4+ Rc3-c4 e6-e5 c5-c6 Tb8-c8 Rc4-d5 e5-e4
26/93+ 2:35:01 28.151.170.138 3.026.000 +1,05 Cb5-c3+

[Paloma]

Albert, from what game is this position?

[kgburcham]

Albert, very challenging position.
Too deep to be put in a test suite.

[d] 1rr3k1/3b1pq1/4p2p/1n1pP2P/2P2QP1/1p6/1P6/1K1RNB1R b - -

Houdini

1st try
25/75 6:46 -1.10++ 1...Nc3+ (13.845.133.859) 34019
25/75 6:58 -1.10 1...Nc3+ 2.bxc3 Ra8 3.Bd3 Qf8 4.c5 Ra4 (14.226.485.423) 34024


2nd try
25/73 6:10 -0.98++ 1...Nc3+ (12.799.403.037) 34580
25/79 8:02 -1.15++ 1...Nc3+ (16.719.874.261) 34621
25/82 11:52 -1.59++ 1...Nc3+ (24.772.629.091) 34751

[Albert Silver]

Albert, very challenging position.
Too deep to be put in a test suite.

[d] 1rr3k1/3b1pq1/4p2p/1n1pP2P/2P2QP1/1p6/1P6/1K1RNB1R b - -

Houdini

1st try
25/75 6:46 -1.10++ 1...Nc3+ (13.845.133.859) 34019
25/75 6:58 -1.10 1...Nc3+ 2.bxc3 Ra8 3.Bd3 Qf8 4.c5 Ra4 (14.226.485.423) 34024


2nd try
25/73 6:10 -0.98++ 1...Nc3+ (12.799.403.037) 34580
25/79 8:02 -1.15++ 1...Nc3+ (16.719.874.261) 34621
25/82 11:52 -1.59++ 1...Nc3+ (24.772.629.091) 34751

Yes, it is the reason I called it Monster Move.

Here is the full annotated game score:


[Event "TCh-RUS Premier"]
[Site "Olginka RUS"]
[Date "2011.04.22"]
[Round "10"]
[White "Kurnosov, Igor"]
[Black "Najer, Evgeniy"]
[Result "1-0"]
[ECO "C11"]
[WhiteElo "2653"]
[BlackElo "2638"]
[Annotator "Albert Silver"]
[PlyCount "107"]
[EventDate "2011.04.12"]
[WhiteTeam "Tomsk-400"]
[BlackTeam "ShSM-64"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 Be7 8. Qd2
O-O 9. dxc5 Bxc5 10. O-O-O Qa5 11. Bxc5 Nxc5 12. h4 Bd7 13. h5 b5 14. Kb1 b4
15. Ne2 Ne4 16. Qe1 Rab8 17. Nd2 Nxd2+ 18. Qxd2 Qc5 19. Nc1 a5 20. Nd3 Qe7 21.
g4 a4 22. Bh3 Rfc8 23. f5 Nd4 24. f6 Qd8 25. Qg5 Qf8 26. Ne1 Nb5 27. Bf1 h6 28.
fxg7 Qxg7 29. Qf4 $2 {Najer was doing very well and misses a winning
continuation here.} Rf8 ({Here he might have finished his amazing journey in
style had he played} 29... b3 $1 30. axb3 axb3 {and here both White's main
choices fail.} {The alternative} 31. c4 {also meets a spectacular demise with}
({The obvious} 31. cxb3 {is punished by} Nc3+ $1 32. bxc3 (32. Kc2 Ne2+ 33. Kd2
Nxf4) 32... Rxb3+ 33. Kc1 Rcxc3+ 34. Kd2 Qf8 {and Black is winning.}) 31...
Nc3+ $3 32. bxc3 Qf8 $1 {and though White has a number of choices, they all
end up losing significant material to avoid mate. Ex:} 33. Rh2 (33. Bd3 Ra8 34.
Rf1 Be8 {and White is lost.}) 33... Ra8 34. Rf2 Be8 {Protecting f7 and freeing
the queen.} 35. Qc1 Ra4 {followed by Rca8 and White is lost.}) 30. Nf3 f6 31.
exf6 Qxf6 32. Qxf6 Rxf6 33. Ne5 Be8 34. Rg1 Rb7 35. g5 hxg5 36. Bd3 Rg7 $2 (
36... Nd6 $1 37. Rxg5+ Rg7 38. Rxg7+ Kxg7 39. Rg1+ Kh8 {and it is equal.} (
39... Kh6 40. Ng4+)) 37. Ng4 Rf4 38. h6 Rh7 39. Bxh7+ Kxh7 40. Rdf1 Bg6 41.
Rxf4 gxf4 42. Rh1 f3 43. Kc1 Nd6 44. Nf6+ Kh8 45. Rg1 f2 46. Rf1 Nf7 47. Ng4
Kh7 48. Rxf2 Bf5 49. Nf6+ Kg6 (49... Kxh6 $2 50. Nxd5 exd5 51. Rxf5) 50. Ng8
Nxh6 51. Nxh6 Kxh6 52. Rf4 b3 53. cxb3 axb3 54. a4 1-0

[stevenaaus]

Yes - it's a great position. But shame it never actually occurred in a game - makes it more exciting.

[Vinvin]

Albert, very challenging position.
Too deep to be put in a test suite.

I don't agree

[Albert Silver]

Yes - it's a great position. But shame it never actually occurred in a game - makes it more exciting.

It happens. Evans wrote in his preface to Keres-Fischer that many of the greatest and most spectacular moves took place in the annotations not the board.

It was nice finding the move on my own though, since as you can see, it takes some serious horsepower to find, and at the time I had only a Core2Duo at my disposal.

[M ANSARI]

Nice position! This is something that an engine would find much quicker in MPV mode. A cluster would probably find it very quick as Nxc3! should be in its first top 5 moves.

[Vinvin]

After 17h :
...
26/93+ 2:35:01 28.151.170.138 3.026.000 +1,05 Cb5-c3+
26/93+ 4:08:52 45.131.562.462 3.022.000 +1,46 Cb5-c3+
26/98 10:35:58 123.806.281.230 3.244.000 +2,27 Cb5-c3+ b2xc3 Dg7-f8 g4-g5 Tb8-a8 g5xh6 Ta8-a1+ Rb1xa1 Df8-a3+ Ra1-b1 Da3-a2+ Rb1-c1 b3-b2+ Rc1-d2 b2-b1D+ Rd2-e3 Da2-a7+ Re3-d2 Db1-f5 Df4-g3+ Rg8-f8 Ce1-c2 Da7-f2+ Dg3xf2 Df5xf2+ Ff1-e2 Df2-f4+ Cc2-e3 Df4xh6 Td1-f1 d5xc4 Th1-h4 Fd7-e8 Th4-f4 Tc8-d8+ Rd2-c1 Td8-a8 Rc1-b2 Dh6-g5 Ce3xc4 Dg5-g2 Tf1-f2 Dg2-b7+ Rb2-c2 Ta8-a2+ Rc2-d3 f7-f5 h5-h6 Fe8-c6 Cc4-d6 Db7-b1+ Rd3-c4 Ta2-a5
27/98+ 12:38:34 148.510.682.746 3.262.000 +2,39 Cb5-c3+

Houdini 1.5 32 bits, 2 threads Intel 3.1 Ghz
Found after 2h35m, still running ...

FEN: 1rr3k1/3b1pq1/4p2p/1n1pP2P/2P2QP1/1p6/1P6/1K1RNB1R b - - 0 1

Houdini_15_w32:
...
25/76+ 37:38 6.630.241.216 2.936.000 +0,91 Dg7-f8
25/76 39:41 7.013.638.743 2.944.000 +0,78 Dg7-f8 Th1-h3 Cb5-a3+ b2xa3 Tb8-a8 Th3xb3 Fd7-a4 Tb3-c3 Fa4xd1 Rb1-c1 Ta8xa3 Tc3xa3 Df8xa3+ Rc1xd1 Da3-a1+ Df4-c1 Da1xe5 c4-c5 De5-d4+ Ce1-d3 Dd4xg4+ Ff1-e2 Dg4-g1+ Rd1-c2 Dg1xc1+ Rc2xc1 f7-f6 Rc1-d2 Rg8-f7 Fe2-g4 Rf7-e7 Rd2-e3 Tc8-a8 Cd3-b4 Ta8-a3+ Re3-d4 Ta3-a4 Rd4-c3 f6-f5 Fg4-d1 Ta4-a1 Cb4-c6+ Re7-d7 Cc6-e5+ Rd7-c7
26/76+ 55:22 9.948.281.962 2.994.000 +0,87 Dg7-f8
26/76 58:26 10.518.827.434 3.000.000 +0,86 Dg7-f8 Th1-h3 Cb5-a3+ b2xa3 Tb8-a8 Th3xb3 Fd7-a4 Tb3-c3 Fa4xd1 Rb1-c1 Ta8xa3 Tc3xa3 Df8xa3+ Rc1xd1 Da3-a1+ Df4-c1 Da1xe5 c4-c5 De5-d4+ Ce1-d3 Dd4xg4+ Ff1-e2 Dg4-g1+ Rd1-c2 Dg1xc1+ Rc2xc1 f7-f6 Fe2-d1 Rg8-f7 Fd1-b3 Tc8-g8 Cd3-f4 f6-f5 Rc1-d2 Rf7-f6 Cf4-d3 Tg8-b8 Rd2-c3 d5-d4+ Rc3-c4 e6-e5 c5-c6 Tb8-c8 Rc4-d5 e5-e4
26/93+ 2:35:01 28.151.170.138 3.026.000 +1,05 Cb5-c3+

[Eelco de Groot]

This is a very tough move for most engines (did not try all). At least none of the top five had any luck in 10 minutes on my OCed quad.

[d]1rr3k1/3b1pq1/4p2p/1n1pP2P/2P2QP1/1p6/1P6/1K1RNB1R b - - 0 31

The winner is 1...Nc3+!!

This is a bit buggy (understatement) but the engine, by chance, can now find 1...Nc3+ just within those ten minutes! No overclocking was used The main problem is I think that White has a move 3. g5, after 1... Nc3+ 2. bxc3 Qf8, that is actually very similar to the 'monster move' .. a passed pawn (after gxh6), still in the middle game that threatens the king, not necessarily all the way to promotion or checkmate, but with the help of rook on open file. Only one move can defeat 3.g5, 3...Ra8{!} it involves a 'rook on open kingfile' sac I think or was it the promoted pawn? If you don't find that move quickly it looks like g5 may be winning for White, even, or maybe even more, if the eval is tuned a bit to better estimate the chances of the passed pawn on b2 from Black... This area of passed pawn or, alternatively, open file evaluation is also a bit of a white area in Stockfish eval still, so I'm not so surprised with your results Albert...ughe, ughe. No offense, this probably is a bit rare and therefore expensive (on runtime) to implement. Kim's Houdini 2.0c finds it quickly enough too!


1rr3k1/3b1pq1/4p2p/1n1pP2P/2P2QP1/1p6/1P6/1K1RNB1R b - -

Engine: Rainbow Serpent 2.2.4 Build 104 (Q6700, 4 threads, 512 MB)
by Tord Romstad, Marco Costalba and Joona Kiiski

13/13 0:01 +0.36++ 1...Nc7 2.Rg1 Rb4 3.g5 Ra4 4.g6 Rca8
5.Qxf7+ Qxf7 6.gxf7+ Kxf7 7.cxd5 exd5
8.Rg6 (2.196.241) 1513

13/17 0:01 +0.04 1...Nc7 2.Rg1 Ra8 3.g5 Ra2 4.g6 Rca8
5.Kc1 Kf8 6.Qxf7+ Qxf7 7.gxf7 Ra1+
8.Kd2 Rxd1+ 9.Kxd1 Ra4 10.Rg8+ Kxf7
11.Rh8 Ra1+ 12.Ke2 Rd1 (2.511.103) 1547

14/17 0:02 +0.12++ 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 c3 6.bxc3 Rxc3 7.Kb2 Rc6 8.Rg3 d4
9.gxh6 Rg6 10.hxg7 (3.896.789) 1676

14/17 0:02 +0.20++ 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 c3 6.g6 c2+ 7.Kc1 Ra8 8.Qf3 fxg6
9.Qxd5+ Kh8 10.hxg6 Ra1+ 11.Kd2 (3.903.690) 1679

14/17 0:02 +0.32++ 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 c3 6.g6 c2+ 7.Kc1 Ra8 8.gxf7+ Kh8
9.f8Q+ Qxf8 10.Qxf8+ Rxf8 11.Kd2 Ra1
12.Rg3 (3.960.715) 1669

14/17 0:02 +0.48 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Kf8 6.e6 Rb7 7.g6 f6 8.Bg2 c3
9.Bxd5 Rb6 (4.586.363) 1689

15/17 0:03 +0.25-- 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 c3 6.bxc3 b2 7.Rg3 Rb3 8.gxh6 Ra3 (5.789.353) 1750

15/17 0:03 +0.56++ 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Rc6 6.Rg4 Qh7+ 7.Kc1 Ra8
8.gxh6+ Kh8 9.Qg5 Rg8 10.Qxg8+ Qxg8
11.Rxg8+ Kxg8 12.h7+ Kxh7 13.Bg2 Kh6 (6.308.583) 1765

15/17 0:03 +0.17-- 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Rb6 6.Rg4 Qh7+ 7.Kc1 Rbc6
8.gxh6+ Qg6 9.hxg6 (6.451.660) 1767

15/17 0:03 +0.67 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Rc6 6.Rg4 Qh7+ 7.Kc1 hxg5
8.Rxg5+ Kf8 9.Bg2 Ke7 (6.954.637) 1775

16/18 0:04 +0.43-- 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Rc6 6.Rg3 Qh7+ 7.Nd3 Kh8 8.e6 Rb5
9.gxh6 Rxe6 (8.869.550) 1810

16/24 0:05 +0.35-- 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Rc6 6.Qd4 hxg5 7.Qxd5 Re6
8.Bxc4 Rxe5 9.Qd6 Ra8 10.Qg6 Qxg6+
11.hxg6 g4 12.Bxb3 Rg5 13.gxf7+ Kg7
14.Kc2 g3 (11.060.222) 1875

16/24 0:06 +0.23-- 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Rc6 6.Qd4 hxg5 7.Qxd5 Re6
8.Bxc4 Rxe5 9.Qd6 Ra8 10.Qg6 g4
11.Qxg7+ Kxg7 12.Rxg4+ Kh7 13.Ng2 f5
14.Rg3 f4 (11.531.325) 1875

16/24 0:06 +0.05-- 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Rc6 6.Qd4 hxg5 7.Qxd5 Re6
8.Bxc4 Rxe5 9.Qd6 Ra8 10.Qg6 Qxg6+
11.hxg6 Kf8 12.Bxf7 g4 13.Bxb3 Rg5
14.Rg3 Ra7 (12.281.938) 1887

16/25 0:06 +0.04 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Rc6 6.Qd4 hxg5 7.Qxd5 Re6
8.Bxc4 Rxe5 9.Qd6 Ra8 10.Qg6 Qxg6+
11.hxg6 Kf8 12.gxf7 Rf5 13.Bxb3 Rb8
14.Ba2 Re5 (12.835.473) 1882

17/25 0:10 +0.04 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Rc6 6.Qd4 hxg5 7.Qxd5 Re6
8.Bxc4 Rxe5 9.Qd6 Ra8 10.Qg6 Qxg6+
11.hxg6 Kf8 12.g7+ Kg8 13.Nd3 Rea5
14.Re1 (21.310.195) 1959

18/25 0:17 +0.11 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Rc6 6.Qd4 hxg5 7.Qxd5 Re6
8.Bxc4 Rxe5 9.Qd6 Ra8 10.Qg6 Qxg6+
11.hxg6 Rea5 12.Bxb3 Kg7 13.gxf7 Rb8
14.Be6 Kf6 (35.254.058) 2019

19/34 0:43 0.00 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.g5 Rc6 6.g6 fxg6 7.e6 Rf8 8.Qd2 Rxf1
9.Rxf1 Qa7 10.Qxd5 Qa2+ 11.Kc1 Qa1+
12.Kd2 Qxb2+ 13.Ke3 Qc1+ 14.Ke2 Qb2+ (94.156.091) 2168

20/41 3:39 +0.07 1...Nc7 2.Rg1 Ra8 3.g5 Ra4 4.g6 Rca8
5.Kc1 Ra1+ 6.Kd2 fxg6 7.Rxa1 Rxa1
8.Rxg6 Rxe1 9.Rxg7+ Kxg7 (477.682.620) 2172

21/41 4:30 +0.15 1...Nc7 2.Rg1 dxc4 3.Rxd7 Nd5 4.Rxd5 exd5
5.Bg2 c3 6.Bxd5 Rd8 7.bxc3 (589.127.214) 2181

22/42 9:57 +0.23++ 1...Nc3+ 2.bxc3 Qf8 3.g5 Ra8 4.gxh6 Ra1+ (1.290.567.228) 2161

22/42 16:32 +0.31++ 1...Nc3+ 2.bxc3 Qf8 3.Bd3 Ra8 4.Rf1 Be8
5.Qd4 Qa3 6.Qf4 (2.168.744.130) 2184

22/42 18:50 +0.43++ 1...Nc3+ 2.bxc3 Qf8 3.cxd5 Qa3
4.Qg5+ hxg5 5.Bg2 exd5 6.Bxd5 Bxg4 (2.477.874.375) 2191

22/49 21:31 +0.61++ 1...Nc3+ 2.bxc3 Qf8 3.Rg1 Qa3 4.Qf2 Ra8
5.Qb2 Qf8 (2.824.137.983) 2185

22/49 27:29 +0.88++ 1...Nc3+ 2.bxc3 Qf8 (3.600.584.805) 2182

22/49 28:21 +1.29 1...Nc3+ 2.bxc3 Qf8 3.Rh2 Ra8 4.Rf2 Be8
5.Qc1 dxc4 6.Rd6 Qg7 7.Qf4 Qh7+
8.Nd3 cxd3 (3.709.247.937) 2179

23/49 28:47 +0.97-- 1...Nc3+ 2.bxc3 Qf8 3.Bd3 Ra8 4.Rf1 Ra1+
5.Kxa1 Bb5 6.Qxf7+ Kh8 7.Qxf8+ (3.763.202.489) 2177

23/49 32:19 +1.36 1...Nc3+ 2.bxc3 Qf8 3.Rd2 Ra8 4.Rf2 Ra7
5.cxd5 Rca8 6.Qxf7+ Qxf7 7.Rxf7 Kxf7
8.Bc4 Ke8 9.Bxb3 Rb8 10.Kc2 Ra3
11.Bc4 Ra5 12.dxe6 (4.242.273.023) 2186

24/65 45:30 +1.44 1...Nc3+ 2.bxc3 dxc4 3.Rxd7 (6.144.553.101) 2250

25/65 45:52 +1.11-- 1...Nc3+ 2.bxc3 b2 3.Qf6 Qh7+ 4.Nc2 Qxc2+
5.Kxc2 Ba4+ 6.Kd2 dxc4 7.Bxc4 Bxd1
8.Rxd1 Rd8+ 9.Bd3 (6.195.025.160) 2250

25/65 45:59 +1.03-- 1...Nc3+ 2.bxc3 b2 3.Qf6 Qh7+ 4.Nc2 Qxc2+
5.Kxc2 (6.210.400.177) 2250

25/65 46:23 +0.90-- 1...Nc3+ 2.bxc3 b2 3.Qf6 Qh7+ 4.Nc2 Qxc2+
5.Kxc2 (6.261.571.827) 2249

25/65 46:41 +0.72-- 1...Nc3+ 2.bxc3 b2 3.Qf6 Qh7+ 4.Nc2 Qxc2+
5.Kxc2 b1Q+ 6.Rxb1 Ra8 7.cxd5 (6.301.050.688) 2249

25/72 75:58 +1.52 1...Nc3+ 2.bxc3 Rc5 3.Qf6 Qxf6
4.exf6 Kf8 5.cxd5 Rxc3 6.Kb2 exd5
7.Kxc3 (10.330.252.681) 2266

26/72 76:32 +1.17-- 1...Nc3+ 2.bxc3 Rc5 3.Qf6 Qxf6
4.exf6 Kf8 5.cxd5 Rxc3 6.Kb2 Rc2+
7.Nxc2 bxc2+ 8.Kxc2 Ba4+ (10.405.108.856) 2265

26/72 76:44 +1.09-- 1...Nc3+ 2.bxc3 Rc5 3.Qf6 Qxf6
4.exf6 Kf8 5.cxd5 Rxc3 6.Kb2 Rc2+
7.Nxc2 bxc2+ 8.Kxc2 Ba4+ 9.Kd2 (10.430.590.080) 2265

26/72 77:04 +0.97-- 1...Nc3+ 2.bxc3 Rc5 3.Qf6 Qxf6
4.exf6 Kf8 5.cxd5 Rxc3 6.Kb2 Rc2+
7.Nxc2 bxc2+ 8.Kxc2 Ba4+ (10.473.079.193) 2264

26/72 77:15 +0.79-- 1...Nc3+ 2.bxc3 Rc5 3.Qf6 Qxf6
4.exf6 (10.496.117.269) 2264

26/72 77:26 +0.52-- 1...Nc3+ 2.bxc3 Rc5 3.Qf6 Qxf6
4.exf6 dxc4 5.Rxd7 e5 6.Bxc4 Rxc4
7.Kb2 (10.520.985.932) 2264

26/72 103:36 +1.59 1...Nc3+ 2.bxc3 Kf8 3.cxd5 Rxc3
4.dxe6 Bxe6 5.Rh2 Rc7 6.Qf6 (14.311.133.278) 2301