Nice exchange sacrifice

[Eelco de Groot]

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

Engine: Rainbow Serpent 1.6.3s(dc) Build 285 (Athlon 2009 MHz, 256 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit

1.00 0:00 +0.80 19...Qf7 (113) 0

2.00 0:00 +0.72 19...Qf7 20.Nd4 Kh8 (240) 0

3.00 0:00 +0.84 19...Qf7 20.Kh1 Nf4 (6.292) 17

4.00 0:00 +0.84 19...Qf7 20.Kh1 Qf4 21.Rad1 Qxd2
22.Rxd2 (46.211) 102

5.00 0:00 +1.09 19...Qf7 20.Rf1 Qf5 21.Bc2 Qh5
22.Ng5 Nxe5 23.Nxe6 (106.797) 184

5.00 0:00 +1.48 19...Rxf3 20.gxf3 Nh4 21.Qd3 Qf7
22.Bd1 Nf5 23.Kh1 Bxf2 24.Rf1 Qg6
25.Rxf2 Ng3+ (274.231) 308

6.00 0:00 +1.17 19...Rxf3 20.gxf3 Nh4 21.Qd3 Rf8
22.Bc2 g6 23.Re2 Rxf3 24.Qd2 Qf7
25.Kh1 Bxf2 (292.155) 316

6.00 0:01 +1.18 19...Qf7 20.Rf1 Nf4 21.Bc2 Qh5
22.Qxd5 cxd5 (620.793) 389

7.01 0:04 +1.57 19...Qf7 20.Kh1 Nf4 21.Rg1 Qh5
22.Nd4 c5 23.Nf3 Bc7 24.Qe3 (1.975.196) 478

7.02 0:06 +1.73 19...Rxf3 20.gxf3 Qf7 21.Bd1 Nf4
22.Kh1 Nh3 23.Rf1 Bc7 24.f4 Nxf4
25.Bg4 Bxe5 26.a4 Qg6 27.f3 (3.147.758) 501

8.01 0:06 +1.57 19...Rxf3 20.gxf3 Qf7 21.Bd1 Nf4
22.Kh1 Nh3 23.Rf1 Qf5 24.a4 Qxe5
25.axb5 cxb5 26.Qe2 Qf6 (3.394.148) 502

9.01 0:17 +1.41 19...Rxf3 20.gxf3 Qf7 21.Bd1 Nf4
22.Kh1 Nh3 23.Rf1 Qf5 24.a4 Qxe5
25.axb5 cxb5 26.Qe2 Qd6 27.Bc2 Bc7 (8.933.800) 503

10.01 0:21 +1.57 19...Rxf3 20.gxf3 Qf7 21.Bd1 Nf4
22.Kh1 Nh3 23.Rf1 Qf5 24.a4 Qxe5
25.axb5 cxb5 26.Qe2 Qd6 27.f4 Nxf4
28.Qd2 Kh8 (10.861.054) 506

11.01 0:34 +1.69 19...Rxf3 20.gxf3 Qf7 21.Bd1 Nf4
22.Kh1 Nh3 23.Rf1 Qf5 24.a4 Qxe5
25.axb5 cxb5 26.Qe2 Qd6 27.f4 Nxf4
28.Qf3 e5 29.Bb3 Qe6 (18.216.552) 523

12.01 1:33 +1.29-- 19...Rxf3 20.gxf3 Rf8 21.Kh1 Rxf3
22.Bc2 Nf4 23.Qd1 Rxf2 24.Rf1 g6
25.Rxf2 Bxf2 26.Qd2 (46.347.789) 496

12.04 2:11 +1.54 19...Nf4 20.Kh1 Qf7 21.Bc2 Nxg2
22.Rg1 Qxf3 23.Rxg2 g6 24.Qh6 Ra7
25.Rag1 Bxf2 26.Rf1 Qe3 27.Qxe3 Bxe3
28.Re1 d4 29.cxd4 Bxd4 (65.723.302) 499

13.01 2:52 +1.69 19...Nf4 20.Bd1 Qf7 21.Kh1 Qg6
22.Rg1 Nd3 23.Rf1 Qe4 24.a4 Rad8
25.Qc2 Rf5 26.a5 Bc5 (86.537.251) 501

14.01 5:16 +1.60 19...Nf4 20.Bd1 Qf7 21.Kh1 Qg6
22.Rg1 Nd3 23.Rf1 Qe4 24.a4 Nxe5
25.Ng5 Qd3 26.Qe1 Qf5 27.f4 Rae8
28.Qe2 (160.101.907) 505

15.01 7:18 +1.54 19...Nf4 20.Kh1 Qf7 21.Bd1 Qg6
22.Rg1 Nd3 23.Rf1 Qe4 24.a4 Ra7
25.Ng5 Qxe5 26.Qxd3 Qxg5 27.Bc2 Qh6
28.axb5 axb5 29.Rxa7 Bxa7 (221.368.820) 505

16.01 11:23 +1.59 19...Nf4 20.Bd1 Qf7 21.Kh1 Qg6
22.Rg1 Nd3 23.Rf1 Qe4 24.a4 Rab8
25.axb5 axb5 26.Ng5 Qxe5 27.Qxd3 Qxg5
28.Qh3 Qg6 29.Bg4 e5 30.Rae1 e4
31.f3 (347.225.729) 508

17.01 31:44 +1.38-- 19...Nf4 20.Bd1 Qf7 21.Kh1 Qg6
22.Rg1 Nd3 23.Rf1 Qe4 24.a4 Rab8
25.axb5 (993.206.598) 521

17.02 39:07 +1.40 19...Rxf3 20.gxf3 Rf8 21.Kh1 Rxf3
22.Bc2 Qf7 23.Bxg6 Qxg6 24.Re2 Qf5
25.Qc2 Qf4 26.Qc1 Qg4 27.Qg1 Qh5
28.Qg2 Rxc3 29.Rg1 g6 (1.224.004.328) 521

18.01 50:40 +1.65 19...Rxf3 20.gxf3 Rf8 21.Kh1 Rxf3
22.Bc2 Qf7 23.Bxg6 Qxg6 24.Re2 Qf5
25.Qc2 Qf7 26.a4 Bxf2 27.axb5 cxb5
28.Qd1 Qf4 29.Rxa6 Rh3 30.Rxf2 Qxf2
31.Qg1 Qxg1+ 32.Kxg1 Kf7 (1.569.011.004) 516

19.01 91:17 +1.57 19...Rxf3 20.gxf3 Rf8 21.Kh1 Rxf3
22.Bc2 Qf7 23.Bxg6 Qxg6 24.Re2 Qf5
25.Qc2 Qf7 26.a4 Bxf2 27.axb5 cxb5
28.Qd1 Qf4 29.Rxa6 Rh3 30.Rxf2 Qxf2
31.Qg1 Qxg1+ 32.Kxg1 Kf7 (2.877.801.560) 525

best move: Rf8xf3 time: 108:17.672 min n/s: 528.416 nodes: 3.433.470.323

[yanquis1972]

i put the default setting on it & accidently left it going for 5+ hours, here is the result --


Time Depth Score Positions Moves
24:53 3/17 -0.64 974745904 1...Rxf3 2.gxf3 ‰f7 3.†d1 ‡f4 4.‹h1
‡h3 5.ˆf1 ‰f5 6.a4 ‰xe5 7.axb5
cxb5 8.‰e2 ‰d6 9.ˆe1 ‡f4 10.‰d2
35:58 3/17 -0.71 1407296354 1...Nf4 2.†d1 ‰e8 3.‰c2 ‰h5 4.‡d4
‰h6 5.‡f3 c5 6.g3 ‡h3+ 7.‹g2 c4
8.ˆf1 ‡g5 9.h4 ‡xf3 10.†xf3 ˆac8
1:12:53 4/18 -0.74 -1404092952 1...Nf4 2.†d1 ‰e8 3.‰c2 ‰h5 4.‡d4
‰g5 5.f3 c5 6.‡xe6 ‡xe6 7.†xd5
ˆae8 8.a4 ‹h8 9.axb5 ‡f4 10.†c6
axb5
3:44:26 5/19 -0.66 424265462 1...Nf4 2.†d1 ‰e8 3.ˆf1 ‰g6 4.g3
‡d3 5.a4 a5 6.‰e2 b4 7.‡d4 c5 8.‡xe6
‰xe6 9.‰xd3 c4 10.‰d2 ‰xe5 11.†g4
4:58:40 5/19 -0.78 -770236423 1...Rxf3 2.gxf3 ˆf8 3.‹h1 ˆxf3
4.†c2 ‰f7 5.†xg6 ‰xg6 6.ˆe2 ‰f5
7.a4 †xf2 8.‰c2 ‰f8 9.axb5 axb5
10.‰d2 †b6 11.ˆg2

[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 - -

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

Evaluation between the two moves is close. I also get +1.21 at depth 26 (single thread) with Stockfish 1.6.3 JA when I force Rxf3:

00:00:00.8 -0,48 1 2 Rxf3
00:00:00.8 -0,48 2 39 Rxf3 gxf3
00:00:00.8 -0,32 3 239 Rxf3 gxf3 Rf8
00:00:00.8 -0,08 4 571 Rxf3 gxf3 Rf8 Qd3
00:00:00.8 0,16 5 1180 Rxf3 gxf3 Rf8 Bd1 Nh4
00:00:00.8 0,56 6 2716 Rxf3 gxf3 Rf8 Bd1 Nf4 Rf1 Nh3+ Kh1
00:00:00.9 0,72 7 26723 Rxf3 gxf3 Rf8 Bd1 Nf4 Kh1 Qf7 Rg1 Qh5 Qe1
00:00:00.9 0,72 8 33936 Rxf3 gxf3 Rf8 Bd1 Nf4 Kh1 Qf7 Rg1 Qh5 Qe1
00:00:00.9 0,92 9 60325 Rxf3 gxf3 Rf8 Bd1 Nf4 Kh1 Qa7 Rf1 Qc7
00:00:01.0 0,84 10 93203 Rxf3 gxf3 Rf8 Bd1 Nf4 a4 Qd8 Kh1 Qg5 Rg1 Qxe5 axb5 axb5

00:00:01.2 0,88 11 158422 Rxf3 gxf3 Rf8 Bd1 Rf5 b3 Qf7 a4 Nh4 Kh1 Rxf3 axb5 Rxf2

00:00:01.5 1,05 12 342412 Rxf3 gxf3 Rf8 Bd1 Qf7 Kh1 Nh4 Rg1 Nxf3 Bxf3 Qxf3+ Rg2 Bxf2 Qg5

00:00:02.4 1,29 13 709756 Rxf3 gxf3 Rf8 Kh1 Rxf3 Bc2 Nf4 Qd1 Rxf2 Rf1 Rxf1+ Qxf1 g5 a4 d4 a5 Qd5+ Kg1

00:00:05.7 0,84 14 2362916 Rxf3 gxf3 Rf8 Kh1 Rxf3 Bc2 Nf4 Qd1 Rxf2 Rf1 Rxf1+ Qxf1 g5 a4 Qd8 Qf3 h5 axb5 axb5 b4 Kf7

00:00:10.2 0,88 15 4590052 Rxf3 gxf3 Rf8 Kh1 Rxf3 Bc2 Nf4 Qd1 Rxf2 Rf1 Rxf1+ Qxf1 g5 a4 a5 axb5 cxb5 h4 Qf7 Qf3 Qg7 Qg4 h6 Rf1 Be3 hxg5 hxg5

00:00:12.5 0,88 16 5767345 Rxf3 gxf3 Rf8 Kh1 Rxf3 Bc2 Nf4 Qd1 Rxf2 Rf1 Rxf1+ Qxf1 g5 a4 a5 axb5 cxb5 h4 Qf7 Qf3 Qg7 Qg4 h6 Rf1 Be3 hxg5 hxg5

00:00:21.8 1,05 17 10545777 Rxf3 gxf3 Rf8 Kh1 Rxf3 Bc2 Nf4 Qd1 Rxf2 Rf1 Rxf1+ Qxf1 g5 a4 a5 axb5 cxb5 h4 Qf7 Qf3 Qg7 Qg4 h6 Rf1 Kh8 Qg3 Qxe5 hxg5 hxg5 Qh2+ Kg8 Qh7+

00:00:35.2 1,05 18 17550336 Rxf3 gxf3 Rf8 Kh1 Rxf3 Bc2 Nf4 Qd1 Rxf2 Rf1 Rxf1+ Qxf1 g5 a4 a5 axb5 cxb5 h4 Qf7 Qf3 Qg7 Qg4 h6 Rf1 Kh8 Qg3 Qxe5 hxg5 hxg5 Qh2+ Kg8 Qh7+

00:00:49.5 1,05 19 25022530 Rxf3 gxf3 Rf8 Kh1 Rxf3 Bc2 Nf4 Qd1 Rxf2 Rf1 Rxf1+ Qxf1 g5 a4 a5 Qf3 Qc7 Qf1 b4 Qa6 Ba7 cxb4 axb4 a5 h6 Rf1 Kf7

00:01:16.0 1,25 20 38704792 Rxf3 gxf3 Rf8 Kh1 Rxf3 Bc2 Qf7 Bxg6 Qxg6 Re2 Qf5 Qc2 Qf4 Rg1 Bxf2 Rf1 Bb6 Rxf3 Qxf3+ Rg2 Qf4

00:03:55.9 1,05 21 118616956 Rxf3 gxf3 Rf8 Bd1 Qd8 Kh1 Qh4 Rg1 Nxe5 Rg2 a5 Qe2 Bc7 Qe3 g6 Be2 b4 Qa7 Rf7 Kg1 bxc3 bxc3

00:09:53.4 0,96 22 293057572 Rxf3 gxf3 Rf8 Bd1 Rf5 Kh1 Qf7 a4 Rxf3 Rf1 Nxe5 Qg5 Rxf2 Be2 Rxf1+ Rxf1 Qc7 axb5 cxb5 Qf4 Ng6 Qxc7 Bxc7 Bg4 Nf4 Rxf4 Bxf4 Bxe6+ Kf8 Bxd5

00:18:51.7 0,96 23 539224938 Rxf3 gxf3 Rf8 Bd1 Rf5 Kh1 Qf7 Rg1 Nxe5 Rg2 Nxf3 Bxf3 Rxf3 Qe2 Qf5 Rag1 g6 Re1 Kf7 Rg5 Qf6 Re5 Rxf2 Rxe6 Rxe2 Rxf6+ Kxf6 Rxe2 Kf5

00:26:57.4 1,17 24 738444371 Rxf3 gxf3 Rf8 Bd1 Rf5 Kh1 Qf7 Rg1 Nxe5 Rg2 Nxf3 Bxf3 Rxf3 Qe2 g6 Qe5 Bxf2 Qb8+ Kg7 Qe5+ Qf6 Qc7+ Kh6 Qxc6 Be3 Qxa6 Rf1+

00:53:23.0 1,25 25 1502906356 Rxf3 gxf3 Rf8 Bd1 Rf5 Kh1 Qf7 Rg1 Nxe5 Rg2 Nxf3 Bxf3 Rxf3 Qe2 g6 Re1 Rf6 Kg1 Rf4 a3 a5 b4 Rf3 Qxe6 Qxe6 Rxe6 Rxc3 Rg5 axb4 axb4 Rc2 Rge5

02:40:47.6 1,21 26 197135025 Rxf3 gxf3 Rf8 Bd1 Rf5 Kh1 Qf7 Rg1 Nxe5 Rg2 Nxf3 Bxf3 Rxf3 Qe2 g6 a4 bxa4 Qxa6 Bxf2 Qxc6 Be3 Qc8+ Kg7 Qa6 e5 Qe2 e4 Rd1 Qf5 Re1 Qf6 Qb5

[Eelco de Groot]

Evaluation between the two moves is close. I also get +1.21 at depth 26 (single thread) with Stockfish 1.6.3 JA when I force Rxf3:

I think that it is most likely that Rxf3 is still a draw. I thought it might be won looking at this endposition that was reached by Rainbow Serpent before:

[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"]
[WhiteElo "2321"]
[BlackElo "2242"]
[ECO "C81"]
[Result "0-1"]

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}
O-O 11. Be3 {+0.13/12 30} Qd7 {-0.06/11 1:17} 12. Nbd2
{+0.13/12 40} Nc5 {-0.08/11 38} 13. Bxc5 {+0.17/14 40} Bxc5
{+0.16/11 38} 14. Ne4 {+0.19/14 40} Bb6 {+0.11/10 38}
15. Neg5 {+0.16/13 40} Ne7 {+0.40/11 38} 16. Re1 {+0.17/12
58} Ng6 {+0.50/10 38} 17. Qd2 {+0.12/12 39} c6 {+0.58/11
38} 18. Nxe6 {+0.05/12 39} fxe6 {+0.75/10 38} 19. c3
{+0.00/13 32} Rxf3 {+0.91/11 38} 20. gxf3 {+0.01/14 39} Qf7
{+0.95/12 38} (20... Rf8 {Variation from Rainbow Serpent:}
21. Kh1 Rxf3 22. Bc2 Qf7 23. Bxg6 Qxg6 24. Re2 Qf5 25. Qc2 Qf7
26. a4 Bxf2 27. axb5 cxb5 28. Qd1 Qf4 29. Rxa6 Rh3 30. Rxf2 Qxf2
31. Qg1 Qxg1+ 32. Kxg1 Kf7 {[d]8/5kpp/R3p3/1p1pP3/8/2P4r/1P5P/6K1 w - -})
21. Bd1 {+0.00/14 39} Rf8 {+0.94/12 2:19}
22. Qg5 {+0.00/14 36} Nf4 {+0.94/12 59} 23. Qg4 {-0.30/15
39} Qa7 {+1.42/12 1:25} 24. Rf1 {-0.93/14 31} Rf5 {+1.84/12
1:03} 25. h4 {-1.26/15 40} Qc7 {+1.54/11 26} 26. Re1
{-1.37/14 40} Nd3 {+1.58/11 26} 27. Re2 {-1.50/14 40} Qf7
{+1.69/10 26} 28. Rd2 {-0.98/13 33 } Nxe5 {+2.06/11 26}
29. Qg3 {-1.15/13 40} Bc7 {+2.22/11 26} 30. Qg2 {-1.54/13
40} Ng6 {+2.39/11 26} 31. Rd4 {-1.71/14 1:59} Nf4 {+2.44/12
1:31} 32. Qg4 {-2.80/14 32} h5 {+3.81/12 1:09} 33. Qg3
{-4.20/17 44} Ne2+ {+4.33/12 13} 34. Bxe2 {-4.36/17 24}
Bxg3 {+4.51/13 35} 35. fxg3 {-4.20/16 31} Rxf3 {+4.72/12 9}
36. Bxf3 {-4.37/16 24} Qxf3 {+4.76/12 9} 37. Rd2 {-4.42/16
32} Qxg3+ {+4.71/12 14} 38. Rg2 {-4.51/16 32} Qxh4
{+4.75/12 11} 39. Rf1 {-4.51/14 32} g5 {+4.90/11 6} 40. Re2
{-4.63/13 16} Qg3+ {+4.84/10 8 } 41. Kh1 {-4.77/14 30} Qh3+
{+4.96/12 2:12} 42. Kg1 {-4.80/15 30} Kg7 {+5.04/12 53}
43. Rfe1 {-4.83/14 30} Kf6 {+5.25/12 51} 44. Re3 {-4.88/15
30} Qg4+ {+5.47/12 1:02} 45. Kh2 {-4.88/15 30} h4 {+5.58/12
45} 46. Rf1+ {-4.83/14 25} Ke7 {+5.76/12 43} 47. Rf2
{-5.06/14 31} Qh5 {+5.97/12 41} 48. Rfe2 {-6.10/15 1:24}
Qf7 {+5.96/11 39} 49. Kg2 {-6.13/14 23} g4 {+6.05/11 37}
50. Rf2 {-6.19/14 23} Qg6 {+6.25/11 35} 51. Re1 {-6.21/13
23} g3 {+6.87/12 1:05} 52. Rfe2 {-7.20/15 47} Qg4
{+11.84/12 1:10} 53. Rxe6+ {-8.39/14 46} Qxe6 {+12.56/12
26} 54. Rxe6+ {-13.63/17 45} Kxe6 {+15.15/15 25} 55. b3
{-14.93/17 44} c5 {+18.42/14 41} 56. a3 {-17.42/17 43} d4
{+19.89/13 22} 57. cxd4 {-18.89/15 21} c4 {+26.54/14 48}
58. bxc4 {-20.51/16 42} h3+ {+32.30/13 1:34} 59. Kxh3
{-15.84/18 41} bxc4 {+327.40/15 13} 60. Kxg3 {-16.09/16 35}
c3 {+327.44/16 13} 61. Kf3 {-326.95/15 39} c2 {+327.48/16
12} 62. a4 {-327.39/63 1.2} c1=Q {+327.50/12 12} 63. Kg4
{-327.41/63 0.1 White resigns} 0-1

This is won but it takes quite some time to see that Black gets one or more passed pawns in the center that are unstoppable.


[d]8/5kpp/R3p3/1p1pP3/8/2P4r/1P5P/6K1 w - -

Engine: Rainbow Serpent 1.6.3s(dc) Build 285 (Athlon 2009 MHz, 256 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit

1.00 0:00 -1.21 33.Ra7+ (41)

2.00 0:00 -1.53 33.Ra7+ Kg6 34.Ra6 Kf5 (2.676)

3.00 0:00 -1.61 33.Ra7+ Kg6 34.Ra6 Kf5 35.Kg2 Rh5 (6.844) 427

3.00 0:00 -1.57 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg3 Kg6 37.Rb6 (23.564) 760

4.00 0:00 -1.77 33.Rb6 Rh5 34.Rxb5 Rxh2 35.Rb7+ (27.021) 574

5.00 0:00 -1.57 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg3 Kg6 37.Rb6 (322.578) 645

6.00 0:00 -1.57 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg3 Kg6 37.Rb6 Kf6 38.b3 (333.868) 647

7.00 0:00 -1.61 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg3 Kg6 37.Rb6 Kf6 38.b4 (346.148) 651

8.00 0:00 -1.53 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg3 Kf6 37.Rb6 Rg5+ 38.Kf2 Kf5
39.b3 Rh5 (457.651) 650

9.00 0:01 -1.69 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Kf6 37.Rb6 Rg5+ 38.Kf3 Rh5
39.Kg3 Ke5 40.Rb7 g6 41.b4 Ke4 42.b5 e5 (883.282) 642

10.01 0:01 -1.69 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Kf6 37.Rb6 Rg5+ 38.Kf3 Rh5
39.Kg3 Ke5 40.Rb7 g6 41.b4 Ke4 42.b5 e5 (1.029.554) 652

11.01 0:01 -1.53 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Kf6 37.Rb6 h6 38.Kg3 g6
39.Ra6 (1.221.701) 662

12.01 0:03 -1.56 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Kf6 37.Ra5 h6 38.b4 Ke5
39.Ra7 g6 40.b5 (2.141.589) 662

13.01 0:05 -1.53 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Kf6 37.Ra5 Rf4 38.Ra6 Kf5
39.Ra7 Rg4+ 40.Kf3 e5 41.b3 Rh4
42.Kg3 g5 43.Rf7+ Ke4 (3.983.101) 670

14.01 0:09 -1.65 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Kf6 37.b4 h6 38.Rc5 Ke5
39.Rc7 g6 40.Rh7 h5 41.Rg7 Rf6 42.b5 (6.369.881) 665

15.01 0:13 -1.69 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Rf4 37.Rc5 Ra4 38.b4 Ra2+
39.Kg3 Rb2 40.Rc7+ Kf6 41.Rc6 Rb1
42.Kf3 d4 43.cxd4 Rxb4 44.Ke4 Rb2
45.h3 (9.041.294) 675

16.01 0:30 -1.76 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Rf4 37.Rc5 Ra4 38.b4 Ra2+
39.Kg3 Rc2 40.h4 Ke7 41.b5 Kd6
42.Rc6+ Kd7 43.h5 Rb2 44.Rb6 Rb3
45.Rb7+ Kd6 46.Rxg7 (21.012.395) 681

17.01 0:52 -1.75 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Rf4 37.Rc5 Rc4 38.Ra5 Kf6
39.Kf2 Rf4+ 40.Kg3 Rf1 41.Ra6 Rb1
42.b4 Ke5 43.Kf3 Rc1 44.Rc6 Rh1
45.Kg3 Rb1 46.Kf3 (35.782.977) 684

18.01 1:16 -1.75 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Rf4 37.h3 Kf6 38.Rb8 g5
39.Rh8 Kg6 40.Rc8 Rf7 41.b4 Kf5
42.Kf3 Ke5+ 43.Ke3 h6 44.Rc6 Rb7
45.Kd3 (51.859.617) 679

19.01 2:57 -1.74 33.Rb6 Re3 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Rf4 37.h3 Re4 38.Kf3 Re1
39.b4 Rf1+ 40.Kg4 Kf6 41.Rc5 Ke5
42.Rc7 Rg1+ 43.Kf3 Kd6 44.Ra7 Rc1
45.Ra6+ Ke5 46.Rc6 (114.943.180) 647

20.01 6:28 -1.75 33.Rb6 Re3 34.Rxb5 Rxe5 35.Kf2 Rf5+
36.Kg2 Kf6 37.b4 Rg5+ 38.Kf2 Ke5
39.Rb7 Rg4 40.Ke3 Kf6 41.b5 Rh4
42.b6 Rxh2 43.Kd4 g5 44.Rb8 Rd2+
45.Kc5 Rb2 46.Rh8 (254.837.705) 656

21.01 13:35 -1.78 33.Rb6 Rh5 34.Rxb5 Rxe5 35.Kf2 Re4
36.Ra5 Kf6 37.Ra8 g5 38.Rc8 Rc4
39.Rh8 Rh4 40.Kg3 e5 41.Rc8 Rc4
42.Rh8 Rc7 43.Rd8 Ke6 (532.161.772) 652

22.01 26:00 -1.98-- 33.Rb6 g5 34.Rd6 Rd3 35.Rd7+ Kg6
36.Rd6 Kf5 (1.014.192.234) 650

23.01 118:15 -2.46 33.Rb6 g5 34.Rxb5 Kg6 35.Rb7 Kf5
36.Kg2 g4 37.Rc7 Kxe5 38.b4 Kd6
39.Rc8 h5 40.b5 Rd3 41.b6 Rd2+
42.Kg3 Rb2 43.Rb8 Kc6 44.Rc8+ Kb7
45.Rh8 Rb3 46.Rxh5 (3.314.072.737) 467

best move: Ra6-b6 time: 409:05.922 min n/s: 389.431 nodes: 9.558.960.225

However the new analysis of the exchange sacrifice seems to lead to slightly less favourable positions for Black where White keeps two Rooks on the board and the exchange, and my guess is this slowly fades out to a draw:

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

Engine: Rainbow Serpent 1.6.3s(dc) Build 286 (Athlon 2009 MHz, 256 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit

1.00 0:00 +0.80 19...Qf7 (113) 0

2.00 0:00 +0.80 19...Qf7 20.Nd4 Kh8 (240) 1

3.00 0:00 +0.80 19...Qf7 20.Kh1 Nf4 (3.349) 14

4.00 0:00 +0.88 19...Qf7 20.Kh1 Qf5 21.Rad1 Nf4 (22.212) 83

4.05 0:02 +0.89 19...Rxf3 20.gxf3 Qf7 21.Bd1 Qf5
22.Bc2 Qxf3 23.Bxg6 hxg6 (955.357) 463

5.01 0:02 +1.01 19...Rxf3 20.gxf3 Qf7 21.Bd1 Nh4
22.Qg5 Nxf3+ 23.Bxf3 Qxf3 24.Qg2 (959.242) 461

5.02 0:04 +1.97 19...Qf7 20.Nd4 Nh4 21.Bc2 c5 22.Nb3 c4
23.Nd4 Qf4 24.Qxf4 Rxf4 25.Rad1 Rg4 (2.479.758) 507

6.01 0:05 +1.37 19...Qf7 20.Kh1 Nf4 21.Bc2 Qh5 22.h4 Nh3 (2.629.309) 503

6.02 0:05 +1.37 19...Rxf3 20.gxf3 Qf7 21.Bd1 Nf4
22.Kh1 Nh3 23.Rf1 Qh5 24.f4 Qh4
25.f3 Nxf4 (2.743.405) 507

7.01 0:05 +1.29 19...Rxf3 20.gxf3 Qf7 21.Bd1 Nf4
22.Kh1 Nh3 23.Rf1 Qg6 24.f4 (2.922.047) 508

7.02 0:15 +1.29 19...Qf7 20.Kh1 Nf4 21.Bc2 Qh5
22.Rg1 Qh6 23.Rgf1 c5 24.Rg1 (7.523.312) 491

8.01 0:15 +1.29 19...Qf7 20.Kh1 Nf4 21.Bc2 Qh5
22.Rg1 Qh6 23.Raf1 c5 24.h4 (7.578.541) 491

8.02 0:16 +2.06++ 19...Rxf3 20.gxf3 Qf7 21.Bd1 Rf8
22.Qg5 Nf4 23.Qg3 Nd3 24.Rf1 b4
25.cxb4 (8.092.383) 494

9.01 0:16 +1.57 19...Rxf3 20.gxf3 Qf7 21.Bd1 Nf4
22.Kh1 Rf8 23.Rf1 Qh5 24.Rg1 Nh3
25.f4 Qh4 (8.319.815) 495

10.01 0:23 +1.61 19...Rxf3 20.gxf3 Qf7 21.Bd1 Nf4
22.Kh1 Rf8 23.Rg1 Nh3 24.Rg2 Qh5
25.Rc1 Qxe5 26.Qe2 Qxe2 27.Bxe2 Nxf2+
28.Rxf2 Bxf2 29.Rf1 Bb6 30.Kg2 Kf7 (11.918.012) 501

11.01 0:40 +1.17 19...Rxf3 20.gxf3 Qf7 21.Bd1 Rf8
22.Kh1 Nf4 23.a4 Nh3 24.Rf1 Qf5
25.axb5 axb5 26.Ra6 Bc7 27.f4 Nxf4 (21.386.520) 527

11.05 0:54 +1.37 19...Nf4 20.Kh1 Nh3 21.Rf1 Rxf3
22.gxf3 Rf8 23.f4 Rxf4 24.f3 Qf7
25.Qg2 Qh5 26.Qg3 Rf8 27.a4 Nf4
28.axb5 Ne2 (28.579.023) 523

12.01 1:06 +1.61 19...Nf4 20.Kh1 Nh3 21.Rf1 Rxf3
22.gxf3 Rf8 23.Bd1 Qc7 24.a4 Qxe5
25.axb5 axb5 26.Ra6 Qc7 27.f4 Nxf4
28.Bc2 (35.032.944) 523

12.02 2:00 +1.62 19...Rxf3 20.gxf3 Rf8 21.Kh1 Nf4
22.Re3 Qf7 23.Rg1 Nh3 24.Rg3 Nxf2+
25.Qxf2 Qf4 26.Qg1 Bxe3 27.Rxg7+ Kh8 (63.760.448) 528

13.01 2:19 +1.61 19...Rxf3 20.gxf3 Rf8 21.Kh1 Qd8
22.Bc2 Nf4 23.Rg1 Nh3 24.Raf1 Nxg1
25.Rxg1 Qh4 26.Rg3 g6 27.Bd3 a5
28.b3 a4 (74.568.625) 532

14.01 3:30 +1.88++ 19...Rxf3 20.gxf3 Rf8 21.Kh1 Rxf3
22.Bc2 Qf7 23.Bxg6 Qxg6 24.Re2 Qf5
25.Qc2 Qf4 26.Rg1 Bxf2 27.Rg2 Bb6 (111.923.468) 531

15.01 4:11 +1.69 19...Rxf3 20.gxf3 Rf8 21.Kh1 Rxf3
22.Bc2 Qf7 23.Bxg6 Qxg6 24.Re2 Qf5
25.Qc2 Qf4 26.Qc1 Qh4 27.Qg1 Qc4
28.Rae1 Qxa2 29.Ra1 Qc4 30.Rd2 (133.664.137) 530

16.01 7:12 +1.37 19...Rxf3 20.gxf3 Rf8 21.Kh1 Rxf3
22.Bc2 Qf7 23.Bxg6 Qxg6 24.Re2 Qf5
25.Qc2 Qf4 26.Qc1 Qh4 27.Qg1 g6
28.Qg2 Qh5 29.Rg1 Rxc3 30.Qg4 Qxg4
31.Rxg4 Rc1+ 32.Kg2 c5 (234.227.998) 541

17.01 41:06 +1.61 19...Rxf3 20.gxf3 Rf8 21.Kh1 Rxf3
22.Bc2 Qf7 23.Bxg6 Qxg6 24.Re2 Qf5
25.Qc2 Qf4 26.Qc1 Qh4 27.Qg1 g6
28.Qg2 Qh5 29.Rg1 Rf4 30.Qg3 Ra4
31.Rd2 Rxa2 32.Re1 Qf5 (1.277.678.762) 518

18.01 78:30 +1.54 19...Rxf3 20.gxf3 Rf8 21.Kh1 Rxf3
22.Bc2 Qf7 23.Bxg6 Qxg6 24.Re2 Qf5
25.Qc2 Qf7 26.Rf1 Be3 27.Qd3 Bh6
28.Qd4 Bf4 29.Qb6 h6 30.Rg1 Bxh2
31.Rg2 Rh3 32.Qxc6 Kh7 (2.458.358.195) 521

19.01 108:11 +1.49 19...Rxf3 20.gxf3 Rf8 21.Kh1 Rxf3
22.Bc2 Qf7 23.Bxg6 Qxg6 24.Re2 Qf5
25.Qc2 Qf7 26.Rf1 g6 27.a3 Qf4
28.Qc1 Qh4 29.Qc2 Qh5 30.Qd2 Bc7
31.Rfe1 Qh3 (3.395.305.585) 523

20.01 218:21 +1.45 19...Rxf3 20.gxf3 Rf8 21.Kh1 Rxf3
22.Bc2 Qf7 23.Bxg6 Qxg6 24.Re2 Qf5
25.Qc2 Qf7 26.Rf1 g6 27.Qd2 Qf5
28.Qc2 Qf4 29.Qd2 Qh4 30.Qe1 Qh3
31.Rg1 Qh5 32.Qd2 Qh4
{[d]6k1/7p/pbp1p1p1/1p1pP3/7q/2P2r2/PP1QRP1P/6RK w - - 0 1 This looks more drawish} (6.903.342.597) 526

best move: Rf8xf3 time: 708:22.266 min n/s: 511.842 nodes: 21.754.440.416