Nice exchange sacrifice

[michiguel]

In this position at the ChessWar tournament, Gaviota played against Bruja Rxf3!?. I think it is a very good move despite that a win is nowhere near the horizon. It is more of a speculative/positional sac. Is it correct judged by the opinion of your favorite tactical monsters?

[d]r4rk1/3q2pp/pbp1p1n1/1p1pP3/8/1BP2N2/PP1Q1PPP/R3R1K1 b - -

Interestingly, Gaviota sacrificed another exchange at f3 later in the game (but that was with decisive advantage already).

The game:
[Event "ChessWar XV C 40m/20'"]
[Site "DEVILLE1-5D9C28"]
[Date "2010.04.04"]
[Round "9.22"]
[White "Bruja 1.9_x64_ja"]
[Black "Gaviota 0.74.41_x64"]
[Result "0-1"]
[ECO "C81"]
[WhiteElo "2321"]
[BlackElo "2242"]
[Annotator "10. -0.01 11... -0.06"]
[PlyCount "125"]
[EventDate "2010.??.??"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5
Be6 9. Qe2 Be7 10. Rd1 {-0.01/12 20} 10... O-O 11. Be3 {+0.13/12 30} 11... Qd7
{-0.06/11 1:17} 12. Nbd2 {+0.13/12 40} 12... Nc5 {-0.08/11 38} 13. Bxc5 {
+0.17/14 40} 13... Bxc5 {+0.16/11 38} 14. Ne4 {+0.19/14 40} 14... Bb6 {
+0.11/10 38} 15. Neg5 {+0.16/13 40} 15... Ne7 {+0.40/11 38} 16. Re1 {
+0.17/12 58} 16... Ng6 {+0.50/10 38} 17. Qd2 {+0.12/12 39} 17... c6 {
+0.58/11 38} 18. Nxe6 {+0.05/12 39} 18... fxe6 {+0.75/10 38} 19. c3 {
+0.00/13 32} 19... Rxf3 {+0.91/11 38} 20. gxf3 {+0.01/14 39} 20... Qf7 {
+0.95/12 38} 21. Bd1 {+0.00/14 39} 21... Rf8 {+0.94/12 2:19} 22. Qg5 {
+0.00/14 36} 22... Nf4 {+0.94/12 59} 23. Qg4 {-0.30/15 39} 23... Qa7 {
+1.42/12 1:25} 24. Rf1 {-0.93/14 31} 24... Rf5 {+1.84/12 1:03} 25. h4 {
-1.26/15 40} 25... Qc7 {+1.54/11 26} 26. Re1 {-1.37/14 40} 26... Nd3 {
+1.58/11 26} 27. Re2 {-1.50/14 40} 27... Qf7 {+1.69/10 26} 28. Rd2 {-0.98/13 33
} 28... Nxe5 {+2.06/11 26} 29. Qg3 {-1.15/13 40} 29... Bc7 {+2.22/11 26} 30.
Qg2 {-1.54/13 40} 30... Ng6 {+2.39/11 26} 31. Rd4 {-1.71/14 1:59} 31... Nf4 {
+2.44/12 1:31} 32. Qg4 {-2.80/14 32} 32... h5 {+3.81/12 1:09} 33. Qg3 {
-4.20/17 44} 33... Ne2+ {+4.33/12 13} 34. Bxe2 {-4.36/17 24} 34... Bxg3 {
+4.51/13 35} 35. fxg3 {-4.20/16 31} 35... Rxf3 {+4.72/12 9} 36. Bxf3 {
-4.37/16 24} 36... Qxf3 {+4.76/12 9} 37. Rd2 {-4.42/16 32} 37... Qxg3+ {
+4.71/12 14} 38. Rg2 {-4.51/16 32} 38... Qxh4 {+4.75/12 11} 39. Rf1 {
-4.51/14 32} 39... g5 {+4.90/11 6} 40. Re2 {-4.63/13 16} 40... Qg3+ {+4.84/10 8
} 41. Kh1 {-4.77/14 30} 41... Qh3+ {+4.96/12 2:12} 42. Kg1 {-4.80/15 30} 42...
Kg7 {+5.04/12 53} 43. Rfe1 {-4.83/14 30} 43... Kf6 {+5.25/12 51} 44. Re3 {
-4.88/15 30} 44... Qg4+ {+5.47/12 1:02} 45. Kh2 {-4.88/15 30} 45... h4 {
+5.58/12 45} 46. Rf1+ {-4.83/14 25} 46... Ke7 {+5.76/12 43} 47. Rf2 {
-5.06/14 31} 47... Qh5 {+5.97/12 41} 48. Rfe2 {-6.10/15 1:24} 48... Qf7 {
+5.96/11 39} 49. Kg2 {-6.13/14 23} 49... g4 {+6.05/11 37} 50. Rf2 {-6.19/14 23}
50... Qg6 {+6.25/11 35} 51. Re1 {-6.21/13 23} 51... g3 {+6.87/12 1:05} 52. Rfe2
{-7.20/15 47} 52... Qg4 {+11.84/12 1:10} 53. Rxe6+ {-8.39/14 46} 53... Qxe6 {
+12.56/12 26} 54. Rxe6+ {-13.63/17 45} 54... Kxe6 {+15.15/15 25} 55. b3 {
-14.93/17 44} 55... c5 {+18.42/14 41} 56. a3 {-17.42/17 43} 56... d4 {
+19.89/13 22} 57. cxd4 {-18.89/15 21} 57... c4 {+26.54/14 48} 58. bxc4 {
-20.51/16 42} 58... h3+ {+32.30/13 1:34} 59. Kxh3 {-15.84/18 41} 59... bxc4 {
+327.40/15 13} 60. Kxg3 {-16.09/16 35} 60... c3 {+327.44/16 13} 61. Kf3 {
-326.95/15 39} 61... c2 {+327.48/16 12} 62. a4 {-327.39/63 1.2} 62... c1=Q {
+327.50/12 12} 63. Kg4 {-327.41/63 0.1 White resigns} 0-1

[zullil]

In this position at the ChessWar tournament, Gaviota played against Bruja Rxf3!?. I think it is a very good move despite that a win is nowhere near the horizon. It is more of a speculative/positional sac. Is it correct judged by the opinion of your favorite tactical monsters?

[d]r4rk1/3q2pp/pbp1p1n1/1p1pP3/8/1BP2N2/PP1Q1PPP/R3R1K1 b - -

Stockfish-1.6.3 (8 threads) switched to Nf4:

Code: Select all

Searching: r4rk1/3q2pp/pbp1p1n1/1p1pP3/8/1BP2N2/PP1Q1PPP/R3R1K1 b - -
infinite: 1 ponder: 0 time: 0 increment: 0 moves to go: 0
 2     +0.36   00:01      168 Nf4 Nd4 
 2     +0.61   00:01      229 Rf5 Rad1 
 3     +0.32   00:01      683 Rf5 Bc2 Rf4 
 4     -0.08   00:01     1555 Rf5 Bc2 Rh5 Ng5 
 4     +0.40   00:01     2413 Qf7 Nd4 c5 Nc6 
 5     +0.65   00:01     5928 Qf7 Bc2 Nh4 Nd4 c5 
 6     +0.61   00:01     9931 Qf7 Bc2 Nh4 Nd4 c5 Nc6 
 6     +0.69   00:01    20159 Nf4 Rf1 c5 Bc2 Nh3+ Kh1 Nf4 
 7  >  +1.01   00:01    33037 Nf4 Rf1 Qf7 Nd4 Qg6 f3 c5 
 8     +1.17   00:01    45983 Nf4 Rf1 Qf7 Nd4 Qg6 g3 Nh3+ Kh1 Bxd4 cxd4 Qe4+ f3 
                              Rxf3 
 9     +0.89   00:01   131966 Nf4 Bd1 Qe8 Qc2 Qf7 Ng5 Qf5 Qxf5 Rxf5 h4 
10     +0.73   00:01   568637 Nf4 Bd1 Qe8 Qc2 Rf5 Nd4 Rg5 Bf3 c5 h4 Rg6 h5 Rg5 
10     +1.58   00:01   710370 Rxf3 gxf3 Rf8 Bd1 Nh4 Kh1 Qf7 f4 Qg6 f3 Rxf4 
11     +1.45   00:01    1209k Rxf3 gxf3 Rf8 Bd1 Qe7 a4 Nf4 Kh1 Qh4 axb5 axb5 
                              Rf1 Nh3 Ra6 Nxf2+ Rxf2 Bxf2 Rxc6 
12     +1.01   00:01    1611k Rxf3 gxf3 Rf8 Bd1 Qe7 a4 Nf4 Kh1 Qh4 axb5 Nh3 Rf1 
                              axb5 Ra6 Nxf2+ Rxf2 Bxf2 Rxc6 Be1 Qd4 
13     +0.85   00:01    2331k Rxf3 gxf3 Rf8 Bd1 Qf7 Qg5 Nf4 Qg3 Nd3 Re2 Qxf3 
                              Qxf3 Rxf3 a4 Rf4 Bc2 Bxf2+ Kg2 Rg4+ Kf3 
14     +0.85   00:02    5607k Rxf3 gxf3 Rf8 Bd1 Qf7 Qg5 Nf4 Qg3 Nd3 Re2 Qh5 Rd2 
                              Nf4 Kh1 Qxe5 Bc2 g6 Qh4 b4 cxb4 Qxb2 
15  >  +1.05   00:02    8786k Rxf3 gxf3 Rf8 Bd1 Qf7 Qg5 Nf4 Qg3 Nd3 Re2 Qh5 Rd2 
                              Nf4 Kh1 Qxe5 Bc2 g6 Qh4 b4 cxb4 Qxb2 
16     +0.89   00:03   10677k Rxf3 gxf3 Rf8 Bd1 Qf7 Qg5 Nf4 Qg3 Nd3 Re2 Qh5 Rd2 
                              Nf4 Kh1 Qxe5 Bc2 g6 a4 b4 cxb4 Qxb2 Rb1 Qe5 
16     +0.97   00:03   14838k Nf4 Bd1 Qe8 Qc2 Qh5 Kh1 Qh6 Rf1 c5 a4 bxa4 g3 Ng6 
                              Rxa4 Qh3 Re1 c4 
17     +1.54   00:05   30514k Nf4 Bd1 Qe8 Qc2 Qh5 Nd4 Qg5 Bf3 c5 Nxe6 Nxe6 Bxd5 
                              Rae8 c4 Bc7 Qe2 Ba5 Red1 
18     +1.58   00:08   49322k Nf4 Bd1 Qe8 Qc2 Qh5 Nd4 Qg5 Bf3 c5 Nxe6 Nxe6 Bxd5 
                              Rae8 Qc1 Qxc1 Raxc1 c4 Re2 Rf5 g3 Rf7 b3 cxb3 
                              axb3 
19     +1.25   00:13   83713k Nf4 Bd1 Qe8 Kh1 Qg6 Rg1 Qd3 Bc2 Qxd2 Nxd2 d4 cxd4 
                              Bxd4 Rgb1 Bxe5 Nf3 Bf6 g3 Nd5 Kg2 c5 
20     +1.29   00:22  152049k Nf4 Bd1 Qe8 Kh1 Qg6 Rg1 Qd3 Bc2 Qxd2 Nxd2 d4 Rgf1 
                              Rad8 cxd4 Bxd4 Rab1 Bxe5 Nf3 Bf6 Rfe1 c5 Re4 Be7 
                              g3 Nd5 Kg2 Rd6 Rbe1 Nb4 Bb3 
21     +1.09   01:05  492496k Nf4 Rf1 Qf7 Bd1 Qg6 g3 Nh3+ Kg2 Nf4+ Kg1 Nd3 a4 
                              Rab8 b4 c5 axb5 cxb4 cxb4 axb5 Ra3 Nf4 Kh1 Nh3 
                              Ra6 Rb7 
22     +1.17   02:05  939823k Nf4 Rf1 Qf7 Bd1 Qg6 g3 Nd3 a4 Rab8 b4 c5 axb5 
                              axb5 Be2 Nf4 bxc5 Bxc5 Nh4 Qh6 Kh1 Nxe2 Qxe2 Qg5 
23     +1.09   03:40    1657M Nf4 Rf1 Qf7 Bd1 Qg6 g3 Nd3 a4 Rab8 axb5 axb5 Be2 
                              Nxf2 Rxf2 Qh5 Nd4 Rxf2 Kxf2 Qxh2+ Ke1 Qxg3+ Kd1 
                              Qg1+ Qe1 Bxd4 cxd4 Qxd4+ Kc2 Qxe5 Bg4 Qxe1 Rxe1 
24     +1.25   07:49    3522M Nf4 Rf1 Qf7 Bd1 Qg6 g3 Nd3 a4 Rab8 axb5 axb5 Be2 
                              Nxf2 Rxf2 Qh5 Nd4 Rxf2 Kxf2 Qxh2+ Ke1 Qxg3+ Kd1 
                              Qg1+ Qe1 Bxd4 cxd4 Qxd4+ Qd2 Qxe5 Ra6 c5 Qc3 d4 
                              Qh3 Qf5 Qxf5 exf5 Bd3 g6 Ra7 
25     +1.25   11:50    5333M Nf4 Rf1 Qf7 Bd1 Qg6 g3 Nd3 a4 Rab8 axb5 axb5 Be2 
                              Nxf2 Rxf2 Qh5 Nd4 Rxf2 Kxf2 Qxh2+ Ke1 Qxg3+ Kd1 
                              Qg1+ Qe1 Bxd4 cxd4 Qxd4+ Qd2 Qxe5 Ra6 c5 Qc3 d4 
                              Qh3 c4 Rxe6 Qc7 Ra6 Rf8 Qe6+ Qf7 Kd2 Re8 Qxf7+ 
                              Kxf7 Bf3 
26     +1.21   20:04    9070M Nf4 Rf1 Qf7 Bd1 Qg6 g3 Nd3 a4 Rab8 axb5 axb5 Be2 
                              Nxf2 Rxf2 Qh5 Nd4 Rxf2 Kxf2 Qxh2+ Ke1 Qxg3+ Kd1 
                              Qg1+ Qe1 Bxd4 cxd4 Qxd4+ Qd2 Qxe5 Ra6 c5 Qc3 Qxc3 
                              bxc3 Kf7 Kc2 e5 Rd6 d4 Rd5 c4 cxd4 exd4 Rxd4 Ke6 
                              Bg4+ Ke5 Rd7 g5 Rxh7 b4 Rc7 
Nodes: 9275087724
Nodes/second: 7532136
Best move: Nf4
Ponder move: Rf1

[metax]

[d]r4rk1/3q2pp/pbp1p1n1/1p1pP3/8/1BP2N2/PP1Q1PPP/R3R1K1 b - - 0 1

Analysis by ChessMind 0.72:

1...Sf4 2.Ld1 Dd8 3.Dc2 c5 4.Te3
=/+ (-0.27) Tiefe: 6/18 00:00:00
1...Sf4 2.Dd1 Dc7 3.Lc2 Tf7 4.a4 Taf8
=/+ (-0.27) Tiefe: 7/20 00:00:01 52kN
1...Sf4 2.Dd1 Da7 3.Tf1 Dc7 4.a4 b4 5.cxb4
=/+ (-0.29) Tiefe: 8/23 00:00:01 156kN
1...Sf4 2.Ld1 Dd8 3.Dc2 c5 4.Tc1 c4 5.Le2 a5
=/+ (-0.29) Tiefe: 9/24 00:00:04 630kN
1...Sf4 2.Ld1 Dd8 3.Dc2 b4 4.cxb4 a5 5.bxa5 Lxa5 6.Te3
= (-0.21) Tiefe: 10/26 00:00:06 1138kN
1...Txf3 2.gxf3 Tf8 3.Ld1 Tf5 4.a4 Sxe5 5.axb5 axb5 6.Ta8+ Ld8
=/+ (-0.38) Tiefe: 10/27 00:00:08 1514kN
1...Txf3 2.gxf3 Tf8 3.Ld1 Tf5 4.a4 b4 5.cxb4 Sxe5 6.f4 Sf7
=/+ (-0.55) Tiefe: 11/27 00:00:08 1574kN
1...Txf3 2.gxf3 Tf8 3.Ld1 Sf4 4.Lc2 Sh3+ 5.Kg2 Df7 6.Lxh7+ Kxh7 7.Dd3+ Dg6+ 8.Dxg6+ Kxg6 9.Kxh3
=/+ (-0.37) Tiefe: 12/27 00:00:12 2341kN

Just a short analysis (the German T is R, S is N, L is B and D is Q).

[zamar]

Stockfish, devel-branch, core i7, 1 thread:

It considers the exchange sacrifise many times, but always turns back to Nf4.

7 +0.65 00:00 23338 Nf4 Rf1 Qc7 a4 Nh3+ Kh1 Rxf3 gxf3 Qxe5 axb5 cxb5
8 +0.61 00:00 40458 Nf4 Rf1 Qc7 a4 Qf7 Bc2 Nxg2 Ng5 Qf4 Qxf4 Nxf4
axb5 axb5 Bxh7+ Kh8
8 > +0.73 00:00 44250 Rxf3 gxf3 Nh4 Bd1 Qf7
8 > +0.81 00:00 44696 Rxf3 gxf3 Nh4 Bd1 Qf7
8 > +0.97 00:00 45451 Rxf3 gxf3 Nh4 Bd1 Qf7
8 > +1.29 00:00 46589 Rxf3 gxf3 Nh4 Bd1 Qf7
8 +1.49 00:00 48262 Rxf3 gxf3 Nh4 Bd1 Qf7 Qd3 Qf4 Qf1 Rf8
9 +1.01 00:00 84697 Rxf3 gxf3 Qf7 Bd1 Rf8 Kh1 Nh4 f4 Qg6 Rg1 Qe4+ f3
Nxf3 Bxf3 Qxf3+ Qg2 Qxg2+ Rxg2 Rxf4
10 +1.01 00:00 106553 Rxf3 gxf3 Qf7 Bd1 Rf8 Kh1 Nh4 f4 Qg6 Rg1 Qe4+ f3
Nxf3 Bxf3 Qxf3+ Qg2 Qxg2+ Rxg2 Rxf4
11 +1.05 00:00 222893 Rxf3 gxf3 Qf7 Bd1 Nf4 Kh1 Nh3 Rf1 Qh5 a4 Qxe5 Qe2
Qd6 axb5 cxb5
12 > +1.13 00:00 243952 Rxf3 gxf3 Qf7 Bd1 Rf8 Kh1 Nh4 f4 Qg6 Rg1 Qe4+ f3
Nxf3 Bxf3 Qxf3+ Qg2 Qxg2+ Rxg2 Rxf4 Rd1 Kf7
12 +1.01 00:00 264680 Rxf3 gxf3 Qf7 Bd1 Rf8 Kh1 Nh4 f4 Qg6 Rg1 Qe4+ f3
Nxf3 Bxf3 Qxf3+ Qg2 Qxg2+ Rxg2 Rxf4 Rd1 Kf7
13 < +0.93 00:00 380999 Rxf3 gxf3 Rf8 Bd1 Qf7 Kh1 Nh4 Rg1 Nxf3 Bxf3 Qxf3+
Rg2 Qe4 Re1
13 > +1.09 00:00 559524 Nf4 Rf1 Qf7 Bc2 Qh5 Nd4 Qxe5 Nxc6 Qh5 Nd4 Qg5
13 > +1.17 00:00 590999 Nf4 Rf1 Qf7 Bc2 Qh5 Nd4 Qxe5 Nxc6 Qh5 Nd4 Qg5
13 > +1.33 00:00 644032 Nf4 Rf1 Qf7 Bc2 Qh5 Nd4 Qxe5 Nxc6 Qh5 Nd4 Qg5
13 +0.97 00:00 812857 Nf4 Bd1 Qe8 Nd4 c5 Ne2 Ng6 f4 c4+ Kh1 Qf7 g3 Bf2
Rf1 Bb6
14 < +0.89 00:01 1308k Nf4 Bd1 Qf7 Qc2 Ng6 Qd2 Qf4 Qxf4 Nxf4 Be2
14 +0.93 00:01 1356k Rxf3 gxf3 Qf7 Bd1 Rf8 Kh1 Nf4 a4 Qf5 Rg1 Nd3 Rg2
Nxe5 axb5 axb5 Bc2
15 > +1.01 00:01 1700k Rxf3 gxf3 Rf8 Bd1 Qd8 Kh1 Qh4 a4 Nf4 Rf1 Nh3 axb5
axb5
15 > +1.09 00:01 1825k Rxf3 gxf3 Rf8 Bd1 Qd8 Kh1 Qh4 a4 Nf4 Rf1 Nh3 axb5
axb5
15 > +1.25 00:02 1988k Rxf3 gxf3 Rf8 Bd1 Qd8 Kh1 Qh4 a4 Nf4 Rf1 Nh3 axb5
axb5
15 +1.21 00:02 2119k Rxf3 gxf3 Rf8 Bd1 Qd8 Kh1 Qh4 a4 Nf4 axb5 Nh3 Rf1
axb5 Ra6 Nxf2+ Rxf2 Bxf2 Rxc6 Bg3 Qe2 Qh6 Kg1 Bf4
Bc2 Be3+ Kh1
16 +1.09 00:03 3085k Rxf3 gxf3 Rf8 Bd1 Qd8 a4 Qh4 axb5 Nf4 Kh1 Nh3 Rf1
axb5 Ra6 Nxf2+ Rxf2 Bxf2 Rxc6 Bg3 Qg2 Bxe5 Rxe6
Qe1+ Qg1
17 < +0.81 00:03 4135k Rxf3 gxf3 Qf7 Bd1 Rf8 Kh1 Nh4 Rg1 Nxf3 Bxf3 Qxf3+
Rg2 Bxf2 Rf1
17 +0.97 00:10 10926k Nf4 Bd1 a5 Kh1 b4 Bc2 Qe8 Nd4 Qh5 Rab1 c5 Nc6 c4
f3 Bc5 Nd4 bxc3 bxc3 Bxd4 Qxd4
18 > +1.17 00:14 15677k Nf4 Bd1 Qf7 Qc2 Qh5 Nd4 Qh6 a4 bxa4 Rxa4 c5 Ne2
Ng6 Ng3 c4 Bf3 Nf4
18 > +1.37 00:16 18011k Nf4 Bd1 Qf7 Qc2 Qh5 Nd4 Qg5 Bf3 c5 Nxe6 Nxe6 Bxd5
Rae8 Bc6 Nf4

18 +1.29 00:19 21019k Nf4 Bd1 Qf7 Rf1 Qg6 g3 Nd3 Be2 Nxf2 Rxf2 Qh5 Rf1
Rxf3 Qd1 Raf8 Bxf3 Qxf3 Qxf3 Rxf3 Kg2 Rxf2+ Rxf2
Bxf2 Kxf2 Kf7 Ke3 Ke7
19 +1.37 00:23 25785k Nf4 Bd1 Qf7 Rf1 Qg6 g3 Nd3 Be2 Nxf2 Rxf2 Qh5 Rf1
Rxf3 Qd1 Raf8 Bxf3 Qxf3 Qxf3 Rxf3 Kg2 Rxf2+ Rxf2
Bxf2 Kxf2 Kf7 Ke3 c5 Kf4 Ke7 g4
20 +1.37 00:25 27929k Nf4 Bd1 Qf7 Rf1 Qg6 g3 Nd3 Be2 Nxf2 Rxf2 Qh5 Rf1
Rxf3 Qd1 Raf8 Bxf3 Qxf3 Qxf3 Rxf3 Kg2 Rxf2+ Rxf2
Bxf2 Kxf2 c5 Ke3 Kf7 a3 Ke7 b4 c4 Kd4 Kd7 h4
21 < +1.29 00:29 32712k Nf4 Bd1 Qe8 Rf1 Qg6 g3 Nd3 b3 Qe4 Qe2 Qf5 Nd4
21 +1.29 00:33 37125k Nf4 Bd1 Qf7 Rf1 Qg6 g3 Nd3 b3 Qe4 Qe2 a5 Qxe4
dxe4 Ng5 Rxf2 Rxf2 Rf8 Nxe4 Nxf2 Nxf2 Rxf2 Kh1
Kf7 Bg4 a4 bxa4 bxa4
22 < +1.21 00:43 49647k Nf4 Bd1 Qf7 Rf1 Qg6 g3 Nd3 a4 Qe4 Nd4 Bxd4 cxd4
bxa4 Rxa4
22 < +1.13 00:56 64059k Nf4 Bd1 Qf7 Rf1
22 < +0.97 01:14 84882k Nf4 Bd1 Qf7 Rf1 Qg6 g3 Rf7 a4 Raf8 axb5 axb5 Ra6
Ba7 Rxc6 Nh3+ Kg2 Qg4 Nd4
22 +1.09 02:56 202021k Nf4 Bd1 Qf7 Rf1 Qg6 g3 Nd3 a4 h6 a5 Bc5 b4 Ba7
Be2 Qe4 Bxd3 Qxf3 Qe2 c5 Rac1 Qf7 Qc2 cxb4 Bh7+
Kh8 cxb4 Qf3
23 +1.09 03:24 234127k Nf4 Bd1 Qf7 Rf1 Qg6 g3 Nd3 a4 h6 axb5 cxb5 Qe2
Qe4 Kg2 Qxe2 Bxe2 Nxb2 Rfb1 Nc4 Bxc4 dxc4 Ra2 g5
Rd1 Bc5 Nd4 Bxd4 Rxd4 Kg7 Rd7+ Kg6
24 > +1.21 03:58 273889k Nf4 Bd1 Qf7 Rf1 Qg6
24 < +0.97 04:28 308782k Nf4 Bd1 Qe8 Rf1 Qg6 g3
24 > +1.33 06:47 472566k Nf4 Bd1 Qf7 Rf1 Qg6 g3 Nd3
24 +0.97 08:28 588327k Nf4 Bd1 Qe8 Rf1 Ra7 Qc2 Qh5 Kh1 Qh6 a4 c5 axb5
axb5 Rxa7 Bxa7 g3 Nh3 Ne1 Ng5 f4 Ne4 Qg2 c4 Bc2
Qg6 Nf3 Be3 Bxe4 dxe4
25 < +0.85 10:51 751036k Nf4 Bd1 Qf7 Rf1
25 > +1.09 11:41 810623k Rxf3
25 > +1.21 12:58 902612k Rxf3 gxf3 Rf8 Bd1 Qa7 a4 Nf4 Kh1 Bxf2 Rf1
25 +0.97 22:56 1596M Nf4 Bd1 Qe8 Rf1 Qg6 g3 Nd3 a4 a5 Nd4 Nxe5 axb5
cxb5 Nxb5 Qd3 Qxd3 Nxd3 Nd4 Rf6 Bb3 Rd8 f4 Rb8
Bc2 Nxb2 Rfb1 Nc4 Kh1 Re8 Ba4 Re7 Kg2 e5 fxe5
Ne3+ Kg1 Rxe5
26 > +1.05 25:12 1753M Nf4 Bd1 Qe8 Rf1 Qg6
26 > +1.13 25:27 1770M Nf4 Bd1 Qe8 Qc2 Qh5
26 < +0.89 26:43 1857M Nf4 Bd1 Qf7 Rf1 Qg6 g3
26 +1.05 30:42 2108M Nf4 Bd1 Qe8 Rf1 Qg6 g3 Nd3 a4 Rab8 axb5 axb5 b4
c5 Be2 Nf4 bxc5 Bxc5 Ra5 Bb6 Ra6 b4 cxb4 Nxe2+
Qxe2 Qg4 Ra3 Qxb4 Rfa1 Qc5 Rd3 Qb5 h3 Qc4 Qd2
27 < +0.97 33:40 2317M Nf4 Bd1 Qf7 Rf1 Qg6
27 > +1.13 37:13 2565M Nf4 Bd1 Qf7 Ng5
27 > +1.21 38:03 2623M Nf4 Rf1 Qf7 Nd4 Qg6 g3 c5 Bc2 Qg5

[Marc MP]

In this position at the ChessWar tournament, Gaviota played against Bruja Rxf3!?. I think it is a very good move despite that a win is nowhere near the horizon. It is more of a speculative/positional sac. Is it correct judged by the opinion of your favorite tactical monsters?

[d]r4rk1/3q2pp/pbp1p1n1/1p1pP3/8/1BP2N2/PP1Q1PPP/R3R1K1 b - -

...

Interestingly, the usually conservative Komodo does the sacrifice:

Code: Select all

New game, 120'/40+60'/20+30'
r4rk1/3q2pp/pbp1p1n1/1p1pP3/8/1BP2N2/PP1Q1PPP/R3R1K1 b - - 0 1

Analysis by Komodo32 1.0 JA:

1...Nf4 
  µ  (-0.94)   Depth: 1   00:00:00
1...Nf4 2.Nd4 
  ³  (-0.62)   Depth: 2   00:00:00
1...Qc7 2.a4 Nf4 3.axb5 cxb5 
  ³  (-0.55)   Depth: 3   00:00:00
1...Nf4 2.Nd4 c5 3.Nf3 
  µ  (-0.82)   Depth: 4   00:00:00
1...Nf4 2.Nd4 c5 3.Ne2 Nxe2+ 4.Qxe2 
  ³  (-0.51)   Depth: 5   00:00:00
1...Nf4 2.Nd4 c5 3.Ne2 Nxe2+ 4.Qxe2 
  ³  (-0.51)   Depth: 5   00:00:00
1...Nf4 2.Nd4 c5 3.Ne2 Nxe2+ 4.Rxe2 c4 5.Bc2 
  µ  (-0.84)   Depth: 6   00:00:00  14kN
1...Nf4 2.Nd4 c5 3.Ne2 Nxe2+ 4.Rxe2 c4 5.Bc2 
  µ  (-0.84)   Depth: 6   00:00:00  22kN
1...Nf4 2.Nd4 c5 3.Ne2 Nxe2+ 4.Rxe2 c4 5.Bc2 Rac8 6.Qg5 
  ³  (-0.65)   Depth: 7   00:00:00  26kN
1...Nf4 2.Nd4 c5 3.Ne2 Nxe2+ 4.Rxe2 c4 5.Bc2 Rac8 6.Qg5 
  ³  (-0.65)   Depth: 7   00:00:00  41kN
1...Nf4 2.Kh1 Qf7 3.Bc2 Qh5 4.Nd4 c5 5.g3 cxd4 6.gxf4 dxc3 7.bxc3 
  µ  (-0.73)   Depth: 8   00:00:00  85kN
1...Nf4 2.Kh1 Qf7 3.Bc2 Qh5 4.Nd4 c5 5.g3 cxd4 6.gxf4 dxc3 7.bxc3 
  µ  (-0.73)   Depth: 8   00:00:00  100kN
1...Nf4 2.Kh1 Qf7 3.Bc2 Qh5 4.Bd1 Qh6 5.Bc2 Rab8 6.h4 Qh5 
  ³  (-0.52)   Depth: 9   00:00:00  144kN
1...Nf4 2.Kh1 Qf7 3.Bc2 Qh5 4.Bd1 Qh6 5.Bc2 Rab8 6.h4 Qh5 
  ³  (-0.52)   Depth: 9   00:00:01  277kN
1...Nf4 2.Kh1 Qf7 3.Bc2 Qh5 4.Nd4 c5 5.Ne2 Qxe5 6.Nxf4 Qxf4 7.Qd3 Qf5 8.Qxf5 exf5 
  µ  (-0.91)   Depth: 10   00:00:01  398kN

1...Nf4 2.Kh1 Qf7 3.Bc2 Qh5 4.Nd4 c5 5.Ne2 Qxe5 6.Nxf4 Qxf4 7.Qd3 Qf5 8.Qxf5 exf5 
  µ  (-0.91)   Depth: 10   00:00:01  412kN

1...Nf4 2.Kh1 Qf7 3.Bc2 Qh5 4.Nd4 c5 5.Ne2 Qxe5 6.Rad1 Rae8 7.g3 Nxe2 8.Rxe2 Qf6 9.Qd3 Qf3+ 10.Qxf3 Rxf3 
  µ  (-0.91)   Depth: 11   00:00:01  520kN

1...Nf4 2.Kh1 Qf7 3.Bc2 Qh5 4.Nd4 c5 5.Ne2 Qxe5 6.Rad1 Rae8 7.g3 Nxe2 8.Rxe2 Qf6 9.Qd3 Qf3+ 10.Qxf3 Rxf3 
  µ  (-0.91)   Depth: 11   00:00:01  551kN

1...Nf4 2.Bd1 Qf7 3.Qc2 Qh5 4.Nd4 Qg5 5.Bf3 Rac8 6.a4 c5 7.a5 Bd8 8.Nb3 
  µ  (-0.83)   Depth: 12   00:00:04  1574kN

1...Nf4 2.Bd1 Qf7 3.Qc2 Qh5 4.Nd4 Qg5 5.Bf3 Rac8 6.a4 c5 7.a5 Bd8 8.Nb3 
  µ  (-0.83)   Depth: 12   00:00:04  1790kN

1...Nf4 2.Bd1 Qf7 3.Qc2 Qh5 4.Nd4 Qg5 5.Bf3 Rac8 6.a4 c5 7.a5 Bc7 8.Nc6 c4 9.h4 Qxh4 10.g3 Nh3+ 11.Kf1 
  µ  (-0.90)   Depth: 13   00:00:05  2390kN

1...Nf4 2.Bd1 Qf7 3.Qc2 Qh5 4.Nd4 Qg5 5.Bf3 Rac8 6.a4 c5 7.a5 Bc7 8.Nc6 c4 9.h4 Qxh4 10.g3 Nh3+ 11.Kf1 
  µ  (-0.90)   Depth: 13   00:00:06  2555kN

1...Nf4 2.Bd1 Qf7 3.Rf1 Qh5 4.g3 Qg6 5.Bc2 Qg4 6.Bd1 c5 7.Kh1 Nh3 8.Qe3 Qf5 9.Be2 d4 
  ³  (-0.55)   Depth: 14   00:00:14  6430kN
1...Nf4 2.Bd1 Qf7 3.Rf1 Qh5 4.g3 Qg6 5.Bc2 Qg4 6.Bd1 c5 7.Kh1 Nh3 8.Qe3 Qf5 9.Be2 d4 
  ³  (-0.55)   Depth: 14   00:00:25  11268kN

1...Nf4 2.Bd1 Qf7 3.Rf1 Qh5 4.g3 Qg6 5.Bc2 Qg4 6.Bd1 c5 7.Kh1 Nh3 8.Ng1 Qe4+ 9.f3 Qf5 10.Bc2 Qg5 11.Bxh7+ Kxh7 12.Qd3+ Kg8 13.Nxh3 Qxe5 
  ³  (-0.38)   Depth: 15   00:00:54  24578kN

1...Qf7 2.Nd4 Nf4 3.Bc2 Qh5 4.Qe3 c5 5.Ne2 Nxe2+ 6.Qxe2 Qxe2 7.Rxe2 c4 8.a4 Bc5 9.b4 cxb3 10.Bxb3 g6 11.axb5 axb5 12.Rea2 
  ³  (-0.56)   Depth: 15   00:01:17  34971kN

1...Qf7 2.Nd4 Nf4 3.Bc2 Qh5 4.Qe3 c5 5.Ne2 Nxe2+ 6.Qxe2 Qxe2 7.Rxe2 c4 8.a4 Bc5 9.b4 cxb3 10.Bxb3 g6 11.axb5 axb5 12.Rea2 
  ³  (-0.56)   Depth: 15   00:01:20  36314kN

1...Qf7 2.Nd4 Nf4 3.Bc2 Qh5 4.Qe3 Bxd4 5.cxd4 Qg4 6.Qf3 Qxf3 7.gxf3 a5 8.Rac1 g6 9.Kh1 Kg7 10.Bb1 Rac8 11.a3 b4 12.Rg1 b3 
  ³  (-0.59)   Depth: 16   00:01:32  42228kN

1...Qf7 2.Nd4 Nf4 3.Bc2 Qh5 4.Qe3 Bxd4 5.cxd4 Qg4 6.Qf3 Qxf3 7.gxf3 a5 8.Rac1 g6 9.Kh1 Kg7 10.Bb1 Rac8 11.a3 b4 12.Rg1 b3 
  ³  (-0.59)   Depth: 16   00:01:38  45601kN

1...Qf7 2.Bd1 Qf4 3.Qxf4 Nxf4 4.a4 c5 5.Rf1 c4 6.axb5 axb5 7.Rxa8 Rxa8 8.g3 Nd3 9.Ng5 Nxe5 10.Kg2 h6 11.Nxe6 Re8 12.Nf4 d4 
  ³  (-0.54)   Depth: 17   00:02:00  56470kN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.Bc2 Qh5 8.Bd1 Qh4 9.axb5 cxb5 10.Kg2 a5 11.Be2 Nf4+ 12.Kh1 Qg5 13.Rg1 
  µ  (-0.84)   Depth: 17   00:02:35  73257kN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.Bc2 Qh5 8.Bd1 Qh4 9.axb5 cxb5 10.Kg2 a5 11.Be2 Nf4+ 12.Kh1 Qg5 13.Rg1 
  µ  (-0.84)   Depth: 17   00:02:36  73447kN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.axb5 cxb5 8.Qe2 Qd6 9.Re1 Nf4 10.Qe5 Qxe5 11.Rxe5 Bxf2 12.Be2 Ra7 13.b4 Kf7 
  µ  (-0.81)   Depth: 18   00:02:42  76468kN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.axb5 cxb5 8.Qe2 Qd6 9.Re1 Nf4 10.Qe5 Qxe5 11.Rxe5 Bxf2 12.Be2 Ra7 13.b4 Kf7 
  µ  (-0.81)   Depth: 18   00:03:14  92891kN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.axb5 cxb5 8.Qe2 Qd6 9.Re1 Nf4 10.Qd2 g6 11.Bc2 Nh3 12.Kg2 Bc7 13.Rh1 Nf4+ 14.Kg1 Bb6 15.h4 e5 
  µ  (-0.92)   Depth: 19   00:03:28  99735kN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.axb5 cxb5 8.Qe2 Qd6 9.Re1 Nf4 10.Qd2 g6 11.Bc2 Nh3 12.Kg2 Bc7 13.Rh1 Nf4+ 14.Kg1 Bb6 15.h4 e5 
  µ  (-0.92)   Depth: 19   00:03:46  109mN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.axb5 cxb5 8.Qe2 Qd6 9.Re1 Nf4 10.Qd2 g6 11.Bc2 Bc7 12.Rg1 Rf8 13.Rg3 a5 14.b3 Nh5 15.Rg2 Rxf3 16.Qd4 
  ³  (-0.64)   Depth: 20   00:04:12  122mN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.axb5 cxb5 8.Qe2 Qd6 9.Re1 Nf4 10.Qd2 g6 11.Bc2 Bc7 12.Rg1 Rf8 13.Rg3 a5 14.b3 Nh5 15.Rg2 Rxf3 16.Qd4 
  ³  (-0.64)   Depth: 20   00:08:59  264mN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.axb5 cxb5 8.Qe2 Qd6 9.Re1 Nf4 10.Qd2 g6 11.Bc2 Bc7 12.Rg1 Rf8 13.Rg3 a5 14.Re1 a4 15.Bd3 Qc5 16.Bc2 Nh5 17.Rxe6 
  µ  (-0.86)   Depth: 21   00:12:07  347mN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.axb5 cxb5 8.Qe2 Qd6 9.Re1 Nf4 10.Qd2 g6 11.Bc2 Bc7 12.Rg1 Rf8 13.Rg3 a5 14.Re1 a4 15.Bd3 Qc5 16.Bc2 Nh5 17.Rxe6 
  µ  (-0.86)   Depth: 21   00:12:57  373mN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.axb5 cxb5 8.Qe2 Qd6 9.Re1 Nf4 10.Qd2 g6 11.Bc2 Bc7 12.Rg1 Rf8 13.Rg3 a5 14.Re1 a4 15.Bd3 Qc5 16.Bc2 Bb6 17.Qe3 
  µ  (-0.86)   Depth: 22   00:13:50  400mN

1...Rxf3 2.gxf3 Qf7 3.Bd1 Nf4 4.Kh1 Nh3 5.Rf1 Qh5 6.a4 Qxe5 7.axb5 cxb5 8.Qe2 Qd6 9.Re1 Nf4 10.Qd2 g6 11.Bc2 Bc7 12.Rg1 Rf8 13.Rg3 a5 14.Re1 a4 15.Bd3 Qc5 16.Bc2 Bb6 17.Qe3 
  µ  (-0.86)   Depth: 22   00:15:39  457mN

1...Rxf3 2.gxf3 Rf8 3.Bd1 Rf5 4.Kh1 Qf7 5.a4 Rxf3 6.Rf1 Nxe5 7.Qe2 Rxf2 8.Rxf2 Qxf2 9.Qxf2 Bxf2 10.axb5 axb5 11.Be2 g6 12.Rf1 Bh4 13.Kg2 Kg7 14.Kh3 Bf6 15.Kg3 Nc4 16.Bxc4 bxc4 17.h4 
  µ  (-0.89)   Depth: 23   00:25:43  712mN

1...Rxf3 2.gxf3 Rf8 3.Bd1 Rf5 4.Kh1 Qf7 5.a4 Rxf3 6.Rf1 Nxe5 7.Qe2 Rxf2 8.Rxf2 Qxf2 9.Qxf2 Bxf2 10.axb5 axb5 11.Be2 g6 12.Rf1 Bh4 13.Kg2 Kg7 14.Kh3 Bf6 15.Kg3 Nc4 16.Bxc4 bxc4 17.h4 
  µ  (-0.89)   Depth: 23   00:28:42  791mN

1...Rxf3 2.gxf3 Rf8 3.Kh1 Rxf3 4.Bc2 Rxf2 5.Re2 Rf3 6.Bxg6 hxg6 7.Rg2 Qf7 8.Qd1 Re3 9.Qc2 Kh7 10.Qf2 Qf5 11.a4 Qxe5 12.Qh4+ Kg8 13.a5 Bc7 14.Qg4 Re1+ 15.Rxe1 Qxe1+ 16.Rg1 Qe5 17.Rg2 
  µ  (-1.04)   Depth: 24   01:07:29  1718mN

1...Rxf3 2.gxf3 Rf8 3.Kh1 Rxf3 4.Bc2 Rxf2 5.Re2 Rf3 6.Bxg6 hxg6 7.Rg2 Qf7 8.Qd1 Re3 9.Qc2 Kh7 10.Qf2 Qf5 11.a4 Qxe5 12.Qh4+ Kg8 13.a5 Bc7 14.Qg4 Re1+ 15.Rxe1 Qxe1+ 16.Rg1 Qe5 17.Rg2 
  µ  (-1.04)   Depth: 24   01:11:55  1840mN

1...Rxf3 2.gxf3 Rf8 3.Kh1 Rxf3 4.Bc2 Rxf2 5.Re2 Rf3 6.Bxg6 hxg6 7.Rg2 Qf7 8.Qd1 Re3 9.Qc2 Kh7 10.Qf2 Qf5 11.a4 Qxe5 12.Qh4+ Kg8 13.a5 Bc7 14.Qg4 Re1+ 15.Rxe1 Qxe1+ 16.Rg1 Qe5 17.Rg2 
  µ  (-1.00)   Depth: 25   01:24:35  2147mN

[yanquis1972]

rybka when asked to compare the moves thinks the '?' is wholly unwarranted --

[-1.01] d=22 1...Rxf3 2.gxf3 Rf8 3.Bd1 Rf5 4.Kh1 Qf7 5.Rg1 Nxe5 6.Rg2 Nxf3 7.Bxf3 Rxf3 8.Qe2 g6 9.a4 bxa4 10.Rxa4 Bxf2 11.Ra1 Bc5 12.Qxa6 Qf6 13.b4 Be3 (2:06:21) 1618383kN
[-0.70] d=22 1...Nf4 2.Bd1 Qf7 3.Rf1 Qg6 4.g3 Nd3 5.a4 a5 6.axb5 cxb5 7.Qe2 Rxf3 8.Qxf3 Rf8 9.Qe2 Nxf2 10.Kg2 Qf5 11.Qh5 Qe4 12.Bf3 Qc2 13.Rae1 g6 14.Qh4 Ng4 15.Kh1 Ne3 16.Rxe3 Bxe3 (2:27:58) 1852808kN

[yanquis1972]

lesser depth/time, but naum:

[-0.91] d=25 1...Rxf3 2.gxf3 Rf8 3.Bd1 (0:11:26) 10113718kN
[-0.65] d=25 1...Nf4 2.Bd1 Qf7 3.Rf1 (0:12:59) 11590233kN

[yanquis1972]

and finally ZM II:

[-0.81] d=23 1...Rxf3 2.gxf3 Rf8 3.Bd1 Rf5 4.Kh1 Qf7 5.Rg1 Nxe5 6.Rg2 Nxf3 7.Bxf3 Rxf3 8.Qe2 g6 9.a4 bxa4 10.Qxa6 Bxf2 11.Qxc6 Ba7 12.Qc8 (0:32:53) 13930378kN
[-0.70] d=23 1...Nf4 2.Bd1 Qe8 3.Rf1 Qg6 4.g3 Nd3 5.a4 h6 6.axb5 cxb5 7.Ra3 Qe4 8.Nd4 Nxe5 9.Re1 Qd3 10.Qxd3 Nxd3 11.Rxe6 Bc5 12.Raxa6 (0:37:30) 15851881kN

so it seems stockfish is something of an outlier

[rightrook]

Hi...This is a neat test move...!

I set up this position in Chess Master 9000 and had some good results.

Morphy, Marshall, and Polgar all find it instantly (and keep it)...
Spassky takes 1 sec.
Tal takes 2 sec.
and Fisher takes about 22 seconds and keeps it...

However, many of the engines only play Nf4....etc

regards

Robert

[zullil]

In this position at the ChessWar tournament, Gaviota played against Bruja Rxf3!?. I think it is a very good move despite that a win is nowhere near the horizon. It is more of a speculative/positional sac. Is it correct judged by the opinion of your favorite tactical monsters?

[d]r4rk1/3q2pp/pbp1p1n1/1p1pP3/8/1BP2N2/PP1Q1PPP/R3R1K1 b - -

Crafty also prefers Nf4:

Code: Select all

Crafty v23.2 (8 cpus)

White(1): setboard r4rk1/3q2pp/pbp1p1n1/1p1pP3/8/1BP2N2/PP1Q1PPP/R3R1K1 b - -
Black(1): st 1800
search time set to 1800.00.
Black(1): display stats
display statistics at end of each search.
Black(1): display

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

Black(1): go
              time limit 30:00 (+0.00) (30:00)
              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     0.05     -1   1. ... Nf4!                    
                8     0.06  -0.33   1. ... Nf4 2. Bd1 Qf7 3. Qc2 Qe7 4.  
                                    Nd4 c5 5. Nc6
                8->   0.06  -0.33   1. ... Nf4 2. Bd1 Qf7 3. Qc2 Qe7 4.  
                                    Nd4 c5 5. Nc6
                9     0.08  -0.36   1. ... Nf4 2. Bd1 Qe8 3. Nd4 c5 4.   
                                    Nc2 Qg6 5. Bf3 c4
                9->   0.08  -0.36   1. ... Nf4 2. Bd1 Qe8 3. Nd4 c5 4.   
                                    Nc2 Qg6 5. Bf3 c4
               10     0.13  -0.25   1. ... Nf4 2. Kh1 Qf7 3. Bc2 Nxg2 4. 
                                    Ng5 Qh5 5. Re2 Qg4 6. Nxh7 <HT>
               10->   0.13  -0.25   1. ... Nf4 2. Kh1 Qf7 3. Bc2 Nxg2 4.  
                                    Ng5 Qh5 5. Re2 Qg4 6. Nxh7 <HT>
               11     0.17  -0.21   1. ... Nf4 2. Kh1 Qa7 3. Rf1 Qf7 4.   
                                    Bc2 Nxg2 5. Bxh7+ Kh8 6. Ng5 Qf4 7.
                                    Qxf4 Nxf4
               11->   0.18  -0.21   1. ... Nf4 2. Kh1 Qa7 3. Rf1 Qf7 4.   
                                    Bc2 Nxg2 5. Bxh7+ Kh8 6. Ng5 Qf4 7.
                                    Qxf4 Nxf4
               12     0.28     -1   1. ... Nf4!                           
               12     0.32  -0.62   1. ... Nf4 2. Kh1 Qf7 3. Bc2 Qh5 4.   
                                    Nd4 c5 5. Nb3 Qg4 6. f3 Qh4 7. Rad1
               12->   0.33  -0.62   1. ... Nf4 2. Kh1 Qf7 3. Bc2 Qh5 4.   
                                    Nd4 c5 5. Nb3 Qg4 6. f3 Qh4 7. Rad1
               13     0.44  -0.64   1. ... Nf4 2. Kh1 Qf7 3. Bd1 Qg6 4.   
                                    Nh4 Qg5 5. g3 Nh3 6. Qxg5 Nxg5 7. f3
                                    a5
               13->   0.45  -0.64   1. ... Nf4 2. Kh1 Qf7 3. Bd1 Qg6 4.   
                                    Nh4 Qg5 5. g3 Nh3 6. Qxg5 Nxg5 7. f3
                                    a5
               14     0.64  -0.68   1. ... Nf4 2. Kh1 Qf7 3. Bd1 Qg6 4.   
                                    Nh4 Qd3 5. Re2 a5 6. a4 b4 7. cxb4
                                    axb4 8. Qxd3 Nxd3
               14->   0.66  -0.68   1. ... Nf4 2. Kh1 Qf7 3. Bd1 Qg6 4.   
                                    Nh4 Qd3 5. Re2 a5 6. a4 b4 7. cxb4
                                    axb4 8. Qxd3 Nxd3
               15     1.02  -0.93   1. ... Nf4 2. Bd1 Qf7 3. Qc2 Qh5 4.   
                                    Kh1 Nxg2 5. Kxg2 Qg4+ 6. Kf1 Rxf3 7.
                                    Bxf3 Qxf3 8. a4 Qh1+ 9. Ke2 Qxh2
               15->   1.06  -0.93   1. ... Nf4 2. Bd1 Qf7 3. Qc2 Qh5 4.   
                                    Kh1 Nxg2 5. Kxg2 Qg4+ 6. Kf1 Rxf3 7.
                                    Bxf3 Qxf3 8. a4 Qh1+ 9. Ke2 Qxh2
               16     1.48  -0.63   1. ... Nf4 2. Bd1 Qf7 3. Qc2 Qh5 4.   
                                    Kh1 Nxg2 5. Kxg2 Qg4+ 6. Kh1 Rxf3 7.
                                    Bxf3 Qxf3+ 8. Kg1 Rf8 9. Re2 g6 10.
                                    Rd1
               16->   1.82  -0.63   1. ... Nf4 2. Bd1 Qf7 3. Qc2 Qh5 4.   
                                    Kh1 Nxg2 5. Kxg2 Qg4+ 6. Kh1 Rxf3 7.
                                    Bxf3 Qxf3+ 8. Kg1 Rf8 9. Re2 g6 10.
                                    Rd1 (s=2)
               17     4.41  -0.70   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Rf7 5. a4 a5 6. Nd4 Nh3+ 7. Kg2
                                    Ng5 8. Bc2 Ne4 9. Bxe4 Qxe4+ 10. Kh3
                                    Qxe5 11. axb5
               17->   4.76  -0.70   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Rf7 5. a4 a5 6. Nd4 Nh3+ 7. Kg2
                                    Ng5 8. Bc2 Ne4 9. Bxe4 Qxe4+ 10. Kh3
                                    Qxe5 11. axb5
               18     7.09  -0.79   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Rac8 5. a4 a5 6. Nd4 Nh3+ 7. Kg2
                                    Ng5 8. Qc2 Ne4 9. Kh1 Bxd4 10. cxd4
                                    c5
               18->   8.53  -0.79   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Rac8 5. a4 a5 6. Nd4 Nh3+ 7. Kg2
                                    Ng5 8. Qc2 Ne4 9. Kh1 Bxd4 10. cxd4
                                    c5
               19    12.67  -0.82   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nc5 6. Nd4 Ne4 7. Qe3
                                    c5 8. Nf3 Qf5 9. a4 d4 10. Qd3 c4
               19->  13.90  -0.82   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nc5 6. Nd4 Ne4 7. Qe3
                                    c5 8. Nf3 Qf5 9. a4 d4 10. Qd3 c4
               20    23.76  -1.18   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Nd4
                                    Rxf2 8. Kxf2 Qxh2+ 9. Ke1 Qxg3+ 10.
                                    Kd1 Qg1+ 11. Qe1 Bxd4 12. cxd4 Qxd4+
                                    13. Kc2 Qxe5
               20->  24.84  -1.18   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Nd4
                                    Rxf2 8. Kxf2 Qxh2+ 9. Ke1 Qxg3+ 10.
                                    Kd1 Qg1+ 11. Qe1 Bxd4 12. cxd4 Qxd4+
                                    13. Kc2 Qxe5
               21    37.92  -1.18   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Nd4
                                    Rxf2 8. Kxf2 Qxh2+ 9. Ke1 Qxg3+ 10.
                                    Kd1 Qg1+ 11. Qe1 Bxd4 12. cxd4 Qxd4+
                                    13. Kc2 Qxe5
               21->  40.11  -1.18   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Nd4
                                    Rxf2 8. Kxf2 Qxh2+ 9. Ke1 Qxg3+ 10.
                                    Kd1 Qg1+ 11. Qe1 Bxd4 12. cxd4 Qxd4+
                                    13. Kc2 Qxe5
               22     1:08  -1.06   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Nd4
                                    Rxf2 8. Kxf2 Qxh2+ 9. Ke1 Qxg3+ 10.
                                    Kd1 Qg1+ 11. Qe1 Bxd4 12. cxd4 Qxd4+
                                    13. Kc2 Qxe5 14. Rd1
               22->   1:20  -1.06   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Nd4
                                    Rxf2 8. Kxf2 Qxh2+ 9. Ke1 Qxg3+ 10.
                                    Kd1 Qg1+ 11. Qe1 Bxd4 12. cxd4 Qxd4+
                                    13. Kc2 Qxe5 14. Rd1
               23     2:00  -1.06   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Nd4
                                    Rxf2 8. Kxf2 Qxh2+ 9. Ke1 Qxg3+ 10.
                                    Kd1 Qg1+ 11. Qe1 Bxd4 12. cxd4 Qxd4+
                                    13. Kc2 Qxe5 14. Bd3 Qd6
               23->   2:22  -1.06   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Nd4
                                    Rxf2 8. Kxf2 Qxh2+ 9. Ke1 Qxg3+ 10.
                                    Kd1 Qg1+ 11. Qe1 Bxd4 12. cxd4 Qxd4+
                                    13. Kc2 Qxe5 14. Bd3 Qd6
               24     5:41  -1.18   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Nd4
                                    Rxf2 8. Kxf2 Qxh2+ 9. Ke1 Qxg3+ 10.
                                    Kd1 Qg1+ 11. Qe1 Bxd4 12. cxd4 Qxd4+
                                    13. Kc2 Qxe5 14. Bd3 Qh2+ 15. Kc3 e5
               24->   6:16  -1.18   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Nd4
                                    Rxf2 8. Kxf2 Qxh2+ 9. Ke1 Qxg3+ 10.
                                    Kd1 Qg1+ 11. Qe1 Bxd4 12. cxd4 Qxd4+
                                    13. Kc2 Qxe5 14. Bd3 Qh2+ 15. Kc3 e5
               25    11:09  -1.07   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Rf1
                                    Rxf3 8. Qd1 Raf8 9. Bxf3 Qxf3 10. Qxf3
                                    Rxf3 11. Kg2 Rxf2+ 12. Rxf2 Bxf2 13.
                                    Kxf2 Kf7 14. Kf3
               25->  15:20  -1.07   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. Be2 Nxf2 6. Rxf2 Qh5 7. Rf1
                                    Rxf3 8. Qd1 Raf8 9. Bxf3 Qxf3 10. Qxf3
                                    Rxf3 11. Kg2 Rxf2+ 12. Rxf2 Bxf2 13.
                                    Kxf2 Kf7 14. Kf3 (s=2)
               26    27:36  -0.97   1. ... Nf4 2. Bd1 Qf7 3. Rf1 Qg6 4.   
                                    g3 Nd3 5. a4 a5 6. axb5 cxb5 7. Qe2
                                    Qe4 8. Ng5 Bxf2+ 9. Rxf2 Rxf2 10. Qxf2
                                    Nxf2 11. Nxe4 Nxd1 <HT>
              time=30:00  mat=0  n=45501523238  fh=92%  nps=25.3M         
              extensions=1596.2M qchecks=1296.3M reduced=989.5M pruned=1606.0M
              predicted=0  evals=825.1M  50move=0  EGTBprobes=0  hits=0
              SMP->  splits=2766749  aborts=355755  data=71/1024  elap=30:00
terminating SMP processes.
Black(1): Nf4
              time used:  30:00