Test Position: Nikolic Fischer revisited 19...Bg4!!

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acase
Posts: 688
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Full name: Andrew R Case

Re: Test Position: Nikolic Fischer revisited 19...Bg4!!

Post by acase » Thu Aug 15, 2019 12:04 am

Vinvin wrote:
Wed Aug 14, 2019 8:59 pm
Is there some conclusion for this position now ?

Eval from Stockfish_190726 (3 best moves) after Bg4!? with a bit of learning.

[d]r3r1k1/pp1q1p2/2p2npb/PPPp2np/3PpNb1/2N1P1PP/1R1B1PBK/3Q1R2 w - - 1 20

Code: Select all

Stockfish_19072603_x64_modern:
...
 34/48	01:35	 834 126 572	8 764 135	-1,81	20.Qc1 Nf3+ 21.Bxf3 exf3 22.hxg4 Bxf4 23.exf4 Nxg4+ 24.Kg1 Ne5 25.f5 Nd3 26.Qb1 Qxf5 27.Kh2 Nxb2 28.Qxb2 h4 29.Qc1 Qg4 30.Bg5 hxg3+ 31.fxg3 f6 32.Bxf6 Kf7 33.Qf4 Qxf4 34.gxf4 Re3 35.Nxd5 cxd5 36.Be5 Rb3 37.Kg3 Rxb5 38.Kxf3 Rxa5 39.Rh1 Ke6 40.Rh7 Rb5 41.Rg7 Rb3+ 42.Kg4
 34/51	01:35	 834 126 572	8 764 135	-1,33	20.hxg4 hxg4 21.Rh1 Nf3+ 22.Bxf3 gxf3 23.Nh3 Kg7 24.Qf1 Rh8 25.Kg1 g5 26.Ra2 g4 27.a6 gxh3 28.Qxh3 Qxh3 29.Rxh3 Bxe3 30.Rh4 Bxd2 31.Rxd2 Rhb8 32.axb7 Rxb7 33.bxc6 Rc7 34.Ra2 a5 35.Kf1 Rxc6 36.Ke1 Kg6 37.Na4 Re6 38.Nb6 Rae8 39.Rxa5 e3 40.Ra7 exf2+ 41.Kxf2
 35/54	01:35	 834 126 572	8 764 135	-0,85	20.Qb1 Nf3+ 21.Bxf3 Bxf3 22.Ng2 a6 23.bxc6 bxc6 24.Rb7 Qe6 25.Ne1 Ng4+ 26.hxg4 hxg4 27.Rh1 Kg7 28.Kg1 Bxh1 29.Kxh1 Bg5 30.Kg1 Rh8 31.Nd1 Qf5 32.Bc3 Rh3 33.Rb8 Rxb8 34.Qxb8 Bf6 35.Kf1 Qh5 36.Ke2 Rh1 37.Qb7 Qh3 38.Kd2 Qf1 39.Kc1 Qc4




Hello Vincent,


All 3 moves suggested by Stockfish still lose for white. If you want to go over the moves with me I am willing to do it.

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Master Om
Posts: 306
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Re: Test Position: Nikolic Fischer revisited 19...Bg4!!

Post by Master Om » Thu Aug 15, 2019 12:59 am

acase wrote:
Sun Nov 23, 2014 1:56 am
This position was posted a little more than 6 years ago (when Depp Rybka 3 reigned supreme) and there was a difference of opinion as to whether the move actually won or not. The late late Robin Smith who was a correspondence GM was of the opinion that the move probably won, which I am in complete agreement with after researching the position for quite a long time.


of course I tried several different replies for white including 20.Qc1, 20.Qa1, 20.Qb1, 20.Qc2, 20.Qb3,20.Qa4, 20.Nxg6, 20.Nfe2, 20.Nce2, 20.Qe1, and 20.f3. I have come to the conclusion that all replies by white lose no matter what. The gentleman at the end of the 6 year old thread named "Mischa" had it all correct as to what Fischer's winning plan was, also it must be pointed out that Fischer himself says the 19.bg4!! wins.

No program solved it then, and none of the programs I have tried to date have ever solved this position (including all of the new ones e.g. Komodo8, Latest Stockfish, Critter, Houdini 4, and Gull 8).

Here is the original thread:
http://talkchess.com/forum/viewtopic.ph ... ic+fischer


And here is the position in question:

[d]r3r1k1/pp1q1p2/2p2npb/PPPp1bnp/3PpN2/2N1P1PP/1R1B1PBK/3Q1R2 b - - 0 19
Analysis by Cfish on my settings

Always Expect the Unexpected

mwyoung
Posts: 1638
Joined: Wed May 12, 2010 8:00 pm

Re: Test Position: Nikolic Fischer revisited 19...Bg4!!

Post by mwyoung » Thu Aug 15, 2019 1:34 am

New game Line
r3r1k1/pp1q1p2/2p2npb/PPPp1bnp/3PpN2/2N1P1PP/1R1B1PBK/3Q1R2 b - - 0 1

Analysis by Lc0 v0.22.0:

1...Bg4 2.Qb1 Nf3+ 3.Bxf3 Bxf3 4.a6 Ng4+ 5.Kg1 Ne5 6.Kh2 Bxf4 7.exf4 Nc4 8.bxc6 Qxc6 9.Ra2 bxa6 10.f5 Rab8 11.Qa1 Nxd2 12.Rxd2 gxf5 13.Ra2 Re6 14.Qc1 Rb4 15.Qg5+ Rg6 16.Qd8+ Kg7 17.Nxd5 Rxd4 18.Rd2 Rxd2
Black is better: -/+ (-0.86) Depth: 20/53 00:01:06 1047kN
(, 14.08.2019)
Professing themselves to be wise, they became fools,
Take on me. foes 0

zullil
Posts: 5609
Joined: Mon Jan 08, 2007 11:31 pm
Location: PA USA
Full name: Louis Zulli

Re: Test Position: Nikolic Fischer revisited 19...Bg4!!

Post by zullil » Thu Aug 15, 2019 11:54 am

acase wrote:
Thu Aug 15, 2019 12:04 am
Vinvin wrote:
Wed Aug 14, 2019 8:59 pm
Is there some conclusion for this position now ?

Eval from Stockfish_190726 (3 best moves) after Bg4!? with a bit of learning.

[d]r3r1k1/pp1q1p2/2p2npb/PPPp2np/3PpNb1/2N1P1PP/1R1B1PBK/3Q1R2 w - - 1 20

Code: Select all

Stockfish_19072603_x64_modern:
...
 34/48	01:35	 834 126 572	8 764 135	-1,81	20.Qc1 Nf3+ 21.Bxf3 exf3 22.hxg4 Bxf4 23.exf4 Nxg4+ 24.Kg1 Ne5 25.f5 Nd3 26.Qb1 Qxf5 27.Kh2 Nxb2 28.Qxb2 h4 29.Qc1 Qg4 30.Bg5 hxg3+ 31.fxg3 f6 32.Bxf6 Kf7 33.Qf4 Qxf4 34.gxf4 Re3 35.Nxd5 cxd5 36.Be5 Rb3 37.Kg3 Rxb5 38.Kxf3 Rxa5 39.Rh1 Ke6 40.Rh7 Rb5 41.Rg7 Rb3+ 42.Kg4
 34/51	01:35	 834 126 572	8 764 135	-1,33	20.hxg4 hxg4 21.Rh1 Nf3+ 22.Bxf3 gxf3 23.Nh3 Kg7 24.Qf1 Rh8 25.Kg1 g5 26.Ra2 g4 27.a6 gxh3 28.Qxh3 Qxh3 29.Rxh3 Bxe3 30.Rh4 Bxd2 31.Rxd2 Rhb8 32.axb7 Rxb7 33.bxc6 Rc7 34.Ra2 a5 35.Kf1 Rxc6 36.Ke1 Kg6 37.Na4 Re6 38.Nb6 Rae8 39.Rxa5 e3 40.Ra7 exf2+ 41.Kxf2
 35/54	01:35	 834 126 572	8 764 135	-0,85	20.Qb1 Nf3+ 21.Bxf3 Bxf3 22.Ng2 a6 23.bxc6 bxc6 24.Rb7 Qe6 25.Ne1 Ng4+ 26.hxg4 hxg4 27.Rh1 Kg7 28.Kg1 Bxh1 29.Kxh1 Bg5 30.Kg1 Rh8 31.Nd1 Qf5 32.Bc3 Rh3 33.Rb8 Rxb8 34.Qxb8 Bf6 35.Kf1 Qh5 36.Ke2 Rh1 37.Qb7 Qh3 38.Kd2 Qf1 39.Kc1 Qc4

Hello Vincent,

All 3 moves suggested by Stockfish still lose for white. If you want to go over the moves with me I am willing to do it.
Lc0 with network 320x24.J13-swa-410000 and 64M nodes does not yet see 22...h4 in its first/best line.

0815 07:36:26.175131 139666645731072 ../../src/mcts/search.cc:384] Stopped search: Reached visits limit: 64000045>=64000000

0815 07:36:26.177371 139666645731072 ../../src/chess/uciloop.cc:218] << info depth 36 seldepth 90 time 2623591 nodes 64000045 score cp -104 hashfull 142 nps 24394 tbhits 2912 multipv 1 pv d1b1 g5f3 g2f3 g4f3 f4g2 a7a6 b5a6 b7a6 b2b7 d7e6 g2h4 g8g7 h4f3 e4f3 b1d1 f6g4 h2g1 e6f5 b7b3 g4f6 g1h2 h6g5 d1b1 f5e6 b1d1 e6f5 d1b1 f6g4 h2g1 f5f6 b1d1 g4h6 g1h2 e8e6 f1h1 f6f5 d1b1 f5f6 b3b6 h6f5 h1f1 a8e8 b1d1 f5h6 b6a6 h6g4 h3g4 h5g4 f1h1 e8h8 h2g1 h8h1

0815 07:36:26.177416 139666645731072 ../../src/chess/uciloop.cc:218] << info depth 36 seldepth 90 time 2623591 nodes 64000045 score cp -128 hashfull 142 nps 24394 tbhits 2912 multipv 2 pv h3g4 h5g4 f1h1 g5f3 g2f3 g4f3 b5c6 b7c6 f4d3 e4d3 d1f3 g8g7 h2g2 e8h8 b2b1 h6g5 b1g1 a8b8 h1h8 b8h8 g1h1 h8h1 g2h1 d7b7 f3d1 f6e4 c3e4 d5e4 d1g4 b7b2 g4g5 b2d2 g5e5 g7h7 h1g2 d2a5 e5e7 a5a2 e7h4 h7g7 h4e4

Vinvin
Posts: 4369
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Full name: Vincent Lejeune

Re: Test Position: Nikolic Fischer revisited 19...Bg4!!

Post by Vinvin » Thu Aug 15, 2019 12:44 pm

acase wrote:
Thu Aug 15, 2019 12:04 am
Vinvin wrote:
Wed Aug 14, 2019 8:59 pm
Is there some conclusion for this position now ?

Eval from Stockfish_190726 (3 best moves) after Bg4!? with a bit of learning.

[d]r3r1k1/pp1q1p2/2p2npb/PPPp2np/3PpNb1/2N1P1PP/1R1B1PBK/3Q1R2 w - - 1 20

Code: Select all

Stockfish_19072603_x64_modern:
...
 34/48	01:35	 834 126 572	8 764 135	-1,81	20.Qc1 Nf3+ 21.Bxf3 exf3 22.hxg4 Bxf4 23.exf4 Nxg4+ 24.Kg1 Ne5 25.f5 Nd3 26.Qb1 Qxf5 27.Kh2 Nxb2 28.Qxb2 h4 29.Qc1 Qg4 30.Bg5 hxg3+ 31.fxg3 f6 32.Bxf6 Kf7 33.Qf4 Qxf4 34.gxf4 Re3 35.Nxd5 cxd5 36.Be5 Rb3 37.Kg3 Rxb5 38.Kxf3 Rxa5 39.Rh1 Ke6 40.Rh7 Rb5 41.Rg7 Rb3+ 42.Kg4
 34/51	01:35	 834 126 572	8 764 135	-1,33	20.hxg4 hxg4 21.Rh1 Nf3+ 22.Bxf3 gxf3 23.Nh3 Kg7 24.Qf1 Rh8 25.Kg1 g5 26.Ra2 g4 27.a6 gxh3 28.Qxh3 Qxh3 29.Rxh3 Bxe3 30.Rh4 Bxd2 31.Rxd2 Rhb8 32.axb7 Rxb7 33.bxc6 Rc7 34.Ra2 a5 35.Kf1 Rxc6 36.Ke1 Kg6 37.Na4 Re6 38.Nb6 Rae8 39.Rxa5 e3 40.Ra7 exf2+ 41.Kxf2
 35/54	01:35	 834 126 572	8 764 135	-0,85	20.Qb1 Nf3+ 21.Bxf3 Bxf3 22.Ng2 a6 23.bxc6 bxc6 24.Rb7 Qe6 25.Ne1 Ng4+ 26.hxg4 hxg4 27.Rh1 Kg7 28.Kg1 Bxh1 29.Kxh1 Bg5 30.Kg1 Rh8 31.Nd1 Qf5 32.Bc3 Rh3 33.Rb8 Rxb8 34.Qxb8 Bf6 35.Kf1 Qh5 36.Ke2 Rh1 37.Qb7 Qh3 38.Kd2 Qf1 39.Kc1 Qc4

Hello Vincent,

All 3 moves suggested by Stockfish still lose for white. If you want to go over the moves with me I am willing to do it.
Hello,
Yes, please give me some best lines already analyzed.
Is there a better move than these 3 (20.Qc1 ; 20.hxg4 ; 20.Qb1 ) ?
I'll make a Study on Lichess with the best lines : https://lichess.org/study/PeXgBH5M

zullil
Posts: 5609
Joined: Mon Jan 08, 2007 11:31 pm
Location: PA USA
Full name: Louis Zulli

Re: Test Position: Nikolic Fischer revisited 19...Bg4!!

Post by zullil » Thu Aug 15, 2019 1:22 pm

acase wrote:
Thu Aug 15, 2019 12:04 am
Vinvin wrote:
Wed Aug 14, 2019 8:59 pm
Is there some conclusion for this position now ?

Eval from Stockfish_190726 (3 best moves) after Bg4!? with a bit of learning.

[d]r3r1k1/pp1q1p2/2p2npb/PPPp2np/3PpNb1/2N1P1PP/1R1B1PBK/3Q1R2 w - - 1 20

Code: Select all

Stockfish_19072603_x64_modern:
...
 34/48	01:35	 834 126 572	8 764 135	-1,81	20.Qc1 Nf3+ 21.Bxf3 exf3 22.hxg4 Bxf4 23.exf4 Nxg4+ 24.Kg1 Ne5 25.f5 Nd3 26.Qb1 Qxf5 27.Kh2 Nxb2 28.Qxb2 h4 29.Qc1 Qg4 30.Bg5 hxg3+ 31.fxg3 f6 32.Bxf6 Kf7 33.Qf4 Qxf4 34.gxf4 Re3 35.Nxd5 cxd5 36.Be5 Rb3 37.Kg3 Rxb5 38.Kxf3 Rxa5 39.Rh1 Ke6 40.Rh7 Rb5 41.Rg7 Rb3+ 42.Kg4
 34/51	01:35	 834 126 572	8 764 135	-1,33	20.hxg4 hxg4 21.Rh1 Nf3+ 22.Bxf3 gxf3 23.Nh3 Kg7 24.Qf1 Rh8 25.Kg1 g5 26.Ra2 g4 27.a6 gxh3 28.Qxh3 Qxh3 29.Rxh3 Bxe3 30.Rh4 Bxd2 31.Rxd2 Rhb8 32.axb7 Rxb7 33.bxc6 Rc7 34.Ra2 a5 35.Kf1 Rxc6 36.Ke1 Kg6 37.Na4 Re6 38.Nb6 Rae8 39.Rxa5 e3 40.Ra7 exf2+ 41.Kxf2
 35/54	01:35	 834 126 572	8 764 135	-0,85	20.Qb1 Nf3+ 21.Bxf3 Bxf3 22.Ng2 a6 23.bxc6 bxc6 24.Rb7 Qe6 25.Ne1 Ng4+ 26.hxg4 hxg4 27.Rh1 Kg7 28.Kg1 Bxh1 29.Kxh1 Bg5 30.Kg1 Rh8 31.Nd1 Qf5 32.Bc3 Rh3 33.Rb8 Rxb8 34.Qxb8 Bf6 35.Kf1 Qh5 36.Ke2 Rh1 37.Qb7 Qh3 38.Kd2 Qf1 39.Kc1 Qc4




Hello Vincent,


All 3 moves suggested by Stockfish still lose for white. If you want to go over the moves with me I am willing to do it.
20. Qb1 Nf3+ 21. Bxf3 Bxf3 22. a6 Ng4+ 23. Kg1

zullil
Posts: 5609
Joined: Mon Jan 08, 2007 11:31 pm
Location: PA USA
Full name: Louis Zulli

Re: Test Position: Nikolic Fischer revisited 19...Bg4!!

Post by zullil » Thu Aug 15, 2019 2:18 pm

zullil wrote:
Thu Aug 15, 2019 1:22 pm
acase wrote:
Thu Aug 15, 2019 12:04 am
Vinvin wrote:
Wed Aug 14, 2019 8:59 pm
Is there some conclusion for this position now ?

Eval from Stockfish_190726 (3 best moves) after Bg4!? with a bit of learning.

[d]r3r1k1/pp1q1p2/2p2npb/PPPp2np/3PpNb1/2N1P1PP/1R1B1PBK/3Q1R2 w - - 1 20

Code: Select all

Stockfish_19072603_x64_modern:
...
 34/48	01:35	 834 126 572	8 764 135	-1,81	20.Qc1 Nf3+ 21.Bxf3 exf3 22.hxg4 Bxf4 23.exf4 Nxg4+ 24.Kg1 Ne5 25.f5 Nd3 26.Qb1 Qxf5 27.Kh2 Nxb2 28.Qxb2 h4 29.Qc1 Qg4 30.Bg5 hxg3+ 31.fxg3 f6 32.Bxf6 Kf7 33.Qf4 Qxf4 34.gxf4 Re3 35.Nxd5 cxd5 36.Be5 Rb3 37.Kg3 Rxb5 38.Kxf3 Rxa5 39.Rh1 Ke6 40.Rh7 Rb5 41.Rg7 Rb3+ 42.Kg4
 34/51	01:35	 834 126 572	8 764 135	-1,33	20.hxg4 hxg4 21.Rh1 Nf3+ 22.Bxf3 gxf3 23.Nh3 Kg7 24.Qf1 Rh8 25.Kg1 g5 26.Ra2 g4 27.a6 gxh3 28.Qxh3 Qxh3 29.Rxh3 Bxe3 30.Rh4 Bxd2 31.Rxd2 Rhb8 32.axb7 Rxb7 33.bxc6 Rc7 34.Ra2 a5 35.Kf1 Rxc6 36.Ke1 Kg6 37.Na4 Re6 38.Nb6 Rae8 39.Rxa5 e3 40.Ra7 exf2+ 41.Kxf2
 35/54	01:35	 834 126 572	8 764 135	-0,85	20.Qb1 Nf3+ 21.Bxf3 Bxf3 22.Ng2 a6 23.bxc6 bxc6 24.Rb7 Qe6 25.Ne1 Ng4+ 26.hxg4 hxg4 27.Rh1 Kg7 28.Kg1 Bxh1 29.Kxh1 Bg5 30.Kg1 Rh8 31.Nd1 Qf5 32.Bc3 Rh3 33.Rb8 Rxb8 34.Qxb8 Bf6 35.Kf1 Qh5 36.Ke2 Rh1 37.Qb7 Qh3 38.Kd2 Qf1 39.Kc1 Qc4




Hello Vincent,


All 3 moves suggested by Stockfish still lose for white. If you want to go over the moves with me I am willing to do it.
20. Qb1 Nf3+ 21. Bxf3 Bxf3 22. a6 Ng4+ 23. Kg1
20. Qb1 Nf3+ 21. Bxf3 Bxf3 22. a6 Ng4+ 23. Kg1 Bxf4 24. exf4 Nh6 25. Kh2 bxa6 26. bxc6 Qxc6

Might want to investigate this line for White, and/or improve upon Black's responses.

acase
Posts: 688
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Re: Test Position: Nikolic Fischer revisited 19...Bg4!!

Post by acase » Thu Aug 15, 2019 2:49 pm

Vinvin wrote:
Thu Aug 15, 2019 12:44 pm
acase wrote:
Thu Aug 15, 2019 12:04 am
Vinvin wrote:
Wed Aug 14, 2019 8:59 pm
Is there some conclusion for this position now ?

Eval from Stockfish_190726 (3 best moves) after Bg4!? with a bit of learning.

[d]r3r1k1/pp1q1p2/2p2npb/PPPp2np/3PpNb1/2N1P1PP/1R1B1PBK/3Q1R2 w - - 1 20

Code: Select all

Stockfish_19072603_x64_modern:
...
 34/48	01:35	 834 126 572	8 764 135	-1,81	20.Qc1 Nf3+ 21.Bxf3 exf3 22.hxg4 Bxf4 23.exf4 Nxg4+ 24.Kg1 Ne5 25.f5 Nd3 26.Qb1 Qxf5 27.Kh2 Nxb2 28.Qxb2 h4 29.Qc1 Qg4 30.Bg5 hxg3+ 31.fxg3 f6 32.Bxf6 Kf7 33.Qf4 Qxf4 34.gxf4 Re3 35.Nxd5 cxd5 36.Be5 Rb3 37.Kg3 Rxb5 38.Kxf3 Rxa5 39.Rh1 Ke6 40.Rh7 Rb5 41.Rg7 Rb3+ 42.Kg4
 34/51	01:35	 834 126 572	8 764 135	-1,33	20.hxg4 hxg4 21.Rh1 Nf3+ 22.Bxf3 gxf3 23.Nh3 Kg7 24.Qf1 Rh8 25.Kg1 g5 26.Ra2 g4 27.a6 gxh3 28.Qxh3 Qxh3 29.Rxh3 Bxe3 30.Rh4 Bxd2 31.Rxd2 Rhb8 32.axb7 Rxb7 33.bxc6 Rc7 34.Ra2 a5 35.Kf1 Rxc6 36.Ke1 Kg6 37.Na4 Re6 38.Nb6 Rae8 39.Rxa5 e3 40.Ra7 exf2+ 41.Kxf2
 35/54	01:35	 834 126 572	8 764 135	-0,85	20.Qb1 Nf3+ 21.Bxf3 Bxf3 22.Ng2 a6 23.bxc6 bxc6 24.Rb7 Qe6 25.Ne1 Ng4+ 26.hxg4 hxg4 27.Rh1 Kg7 28.Kg1 Bxh1 29.Kxh1 Bg5 30.Kg1 Rh8 31.Nd1 Qf5 32.Bc3 Rh3 33.Rb8 Rxb8 34.Qxb8 Bf6 35.Kf1 Qh5 36.Ke2 Rh1 37.Qb7 Qh3 38.Kd2 Qf1 39.Kc1 Qc4

Hello Vincent,

All 3 moves suggested by Stockfish still lose for white. If you want to go over the moves with me I am willing to do it.
Hello,
Yes, please give me some best lines already analyzed.
Is there a better move than these 3 (20.Qc1 ; 20.hxg4 ; 20.Qb1 ) ?
I'll make a Study on Lichess with the best lines : https://lichess.org/study/PeXgBH5M

Ok, lets start with the best move out of the 3 which is 20.Qb1, here is what I have so far:



zullil
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Re: Test Position: Nikolic Fischer revisited 19...Bg4!!

Post by zullil » Thu Aug 15, 2019 3:00 pm

acase wrote:
Thu Aug 15, 2019 2:49 pm

Ok, lets start with the best move out of the 3 which is 20.Qb1, here is what I have so far:
And your line seems to agree with what I recently posted:

20. Qb1 Nf3+ 21. Bxf3 Bxf3 22. a6 Ng4+ 23. Kg1 Bxf4 24. exf4 Nh6 25. Kh2 bxa6 26. bxc6 Qxc6

And we have



Which seems like it should be a (not so fast) win for Black.

zullil
Posts: 5609
Joined: Mon Jan 08, 2007 11:31 pm
Location: PA USA
Full name: Louis Zulli

Re: Test Position: Nikolic Fischer revisited 19...Bg4!!

Post by zullil » Thu Aug 15, 2019 5:21 pm

zullil wrote:
Thu Aug 15, 2019 3:00 pm
acase wrote:
Thu Aug 15, 2019 2:49 pm

Ok, lets start with the best move out of the 3 which is 20.Qb1, here is what I have so far:
And your line seems to agree with what I recently posted:

20. Qb1 Nf3+ 21. Bxf3 Bxf3 22. a6 Ng4+ 23. Kg1 Bxf4 24. exf4 Nh6 25. Kh2 bxa6 26. bxc6 Qxc6

And we have



Cfish-dev currently shows:

-2.58 27. Be3 Kg7 28. f5 Nxf5 29. Qa2 Red8 30. Bf4 f6 31. h4 Nxd4 32. Rfb1 Rd7 33. Rd2 Nb5 34. Qb2 Rc8 35. Nxb5 axb5 36. Qxb5 Qxb5 37. Rxb5 d4 38. Be3 d3 39. Ra2 Kf7 40. Kg1 Rcc7 41. Rbb2 Be2 42. Ra4 Rb7 43. Rxb7 Rxb7 44. Kh2 Bf3 45. g4 Bxg4 46. Kg3 Rd7 47. Bd2 Ke6 48. Ra6+ Kd5 49. Rxf6 Kxc5 50. Rxg6 Rf7 51. Kg2 Kc4 52. Rc6+ Kd5 53. Ra6 Rb7 54. Be3 Kc4 55. Rc6+ Kb3 56. Rc5 Bf3+ 57. Kg3 Rg7+ 58. Kf4 Rg4+ 59. Ke5 (depth 53, 2:05:45)

Which seems like it should be a (not so fast) win for Black.

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