David Dahlem wrote:[d]2r3k1/6pp/3pp1P1/1pP5/1P6/P4R2/5K2/8 w - - 0 1
Interesting position, a "White to Win" study by Skuja & Giese. On my slow machine, Stockfish 1.6.3s takes almost 1-1/2 hours to show a winning score.
What's blacks best response to c6?
Stockfish 1.6.3s:
27 01:43 150.209.556 1.447.802 0.00 c5xd6 h7xg6 Rf3e3 Kg8f7 Re3e5 Rc8c3 Re5xb5 Rc3xa3 Rb5b7+ Kf7f6 b4b5 Ra3d3 d6d7 Kf6e7 d7d8N+ Ke7xd8 Rb7xg7 Rd3b3 Rg7xg6 Rb3xb5 Rg6g3 Kd8e7 Rg3d3 Rb5b8 Kf2e2 Ke7f6 Ke2f2 Kf6e7
27+ 05:00 393.253.849 1.308.665 +0.20 c5c6 e6e5 a3a4 Rc8xc6 Rf3f8+ Kg8xf8 g6xh7 Rc6c2+ Kf2g3
28+ 10:09 768.297.958 1.261.765 +1.01 c5c6 h7h6 Rf3c3
29 1:26:34 6.350.970,250 1.222.718 +4.12 c5c6 h7xg6 Rf3c3 d6d5 a3a4 b5xa4 b4b5 a4a3 Rc3xa3 Kg8f7 Ra3a7+ Kf7e8 Ra7xg7 Ke8f8 Rg7xg6 Kf8f7 Rg6h6 d5d4 c6c7 Kf7e7 b5b6 Ke7d7 Rh6xe6 Kd7xe6 b6b7 Rc8xc7 b7b8Q Rc7c3 Qb8f4 Ke6d5 Qf4f5+ Kd5d6 Kf2e2 Rc3e3+ Ke2d2 Re3c3 Qf5e4 Kd6c5 Qe4e5+ Kc5c4 Qe5d6 Rc3d3+ Kd2e2 Rd3c3 Qd6c6+ Kc4b4
New game, Blitz:5' Microsoft
2r3k1/6pp/3pp1P1/1pP5/1P6/P4R2/5K2/8 w - - 0 1
Analysis by Deep Sjeng WC2008 x64:
1.gxh7+ Kxh7 2.cxd6 Rd8 3.Rh3+ Kg6 4.Rg3+ Kf5
± (0.74) Depth: 3/12 00:00:00
1.gxh7+ Kxh7 2.cxd6 Rd8 3.Rd3 e5
² (0.63) Depth: 4/13 00:00:00
1.gxh7+ Kxh7 2.cxd6 Rd8 3.Rd3 Kg6 4.Kg3 e5
² (0.52) Depth: 5/14 00:00:00
1.gxh7+ Kxh7 2.cxd6 Rd8 3.Rd3 Kg6 4.Kg3 e5 5.Kg4
² (0.48) Depth: 6/18 00:00:00 35kN
1.gxh7+ Kxh7 2.cxd6 Rd8 3.Rd3 Kg6 4.Kg3 Kf5 5.d7 e5 6.Rf3+ Ke6
² (0.51) Depth: 7/18 00:00:00 61kN
1.gxh7+ Kxh7 2.cxd6 Rd8 3.Rd3 Kg6 4.Rd1 e5 5.Ke3 Kf6 6.d7 Ke7
² (0.61) Depth: 8/20 00:00:00 126kN
1.gxh7+ Kxh7 2.cxd6 Rd8 3.Rd3 Kg6 4.Ke3 Kf5 5.Rd2 Rd7 6.a4 bxa4 7.Rf2+ Ke5
² (0.52) Depth: 9/23 00:00:00 237kN
1.gxh7+
= (0.22) Depth: 10/23 00:00:00 325kN
1.cxd6 hxg6 2.Rd3 Rd8 3.Ke3 Kf7 4.Ke4 g5 5.Ke5 g4
² (0.31) Depth: 10/23 00:00:00 432kN
1.cxd6 hxg6 2.Rd3 Rd8 3.Ke3 Kf7 4.Ke4 g5 5.Ke5 g4
² (0.31) Depth: 10/23 00:00:00 432kN
1.cxd6 hxg6 2.Rd3 Rd8 3.Ke3 Kf7 4.Ke4 Ke8 5.Ke5 g5 6.Kxe6 g4
² (0.51) Depth: 11/23 00:00:00 566kN
1.cxd6 hxg6 2.Rd3 Kf7 3.Kf3 Kf6 4.Ke4 g5 5.Rf3+ Kg6 6.Ke5 g4 7.Rd3
² (0.60) Depth: 12/23 00:00:00 748kN
1.cxd6 hxg6 2.Rd3 Kf7 3.Kf3 e5 4.d7 Rd8 5.Rd5 Ke6 6.Ke4 Rxd7 7.Rxe5+ Kf6 8.Rxb5
² (0.32) Depth: 13/24 00:00:00 992kN
1.cxd6 hxg6 2.Rd3 Kf7 3.Kf3 Kf6 4.Ke4 Rc4+ 5.Ke3 Rc8 6.Ke4
² (0.33) Depth: 14/25 00:00:00 1537kN
1.cxd6 hxg6 2.Rd3 Kf7 3.Ke3 Kf6 4.a4 bxa4 5.Kd4 e5+ 6.Kd5 Ra8 7.Rf3+ Kg5 8.b5 a3 9.Kxe5
= (0.22) Depth: 15/29 00:00:00 2964kN
1.cxd6 hxg6 2.Rd3 Kf7 3.Ke3 Kf6 4.a4 bxa4 5.Kd4 Ra8 6.Rf3+ Kg5 7.Ke5 a3 8.Rg3+ Kh5 9.Rd3
= (0.15) Depth: 16/32 00:00:01 5381kN
1.cxd6 hxg6 2.Rd3 Kf7 3.Ke3 Kf6 4.Ke4 Rc4+ 5.Kf3 Rc8 6.Ke4
= (0.14) Depth: 17/33 00:00:01 12422kN
1.cxd6 hxg6 2.Kg3 e5 3.Re3 Rd8 4.Rxe5 Rxd6 5.Rxb5 Rd3+ 6.Kf4 Rxa3 7.Rb7 Kh7 8.Rb8 Ra4 9.Ke4 g5 10.Kf5
= (0.10) Depth: 18/42 00:00:06 35724kN
1.cxd6 hxg6 2.Kg3 g5 3.Rd3 Kf7 4.Kf3 Kf6 5.Ke4 Rc4+ 6.Ke3 Rc8 7.Ke4
= (0.00) Depth: 19/42 00:00:09 50984kN
1.cxd6 hxg6 2.Kg3 g5 3.Rd3 Kf7 4.Kf3 Kf6 5.Ke4 Rc4+ 6.Ke3 Rc8 7.Ke4
= (0.00) Depth: 20/46 00:00:13 116965kN
1.cxd6 hxg6 2.Kg3 g5 3.Rd3 Kf7 4.Kf3 Kf6 5.Ke4 Rc4+ 6.Ke3 Rc8 7.Ke4
= (0.00) Depth: 21/46 00:00:14 124063kN
1.cxd6 hxg6 2.Rd3 Kf7 3.Ke3 Rh8 4.Kd4 Rh5 5.Ke4 Rh4+ 6.Ke5 Rh5+ 7.Kf4 Rd5 8.Rxd5 exd5 9.Ke5 g5 10.Kxd5 g4 11.Kc6 g5 12.d7 Ke7 13.Kc7
= (0.00) Depth: 22/50 00:00:41 284418kN
1.c6
² (0.30) Depth: 22/57 00:00:56 453984kN
1.c6 hxg6 2.Rc3 d5 3.a4 bxa4 4.b5 a3 5.Rxa3 Kf7 6.Ra7+ Kf6 7.Ke3 Ke5 8.c7 Kd6 9.b6 Rf8 10.Rb7 Kd7 11.Rb8 Rc8 12.Rxc8 Kxc8 13.Kf4 g5+ 14.Kxg5 d4 15.Kg4 e5
+- (1.50) Depth: 22/61 00:01:37 729904kN
1.c6 hxg6 2.Rc3 d5 3.a4 bxa4 4.b5 a3 5.Rxa3 Kf7 6.Ra7+ Kf6 7.Ke3 Ke5 8.c7 Kd6 9.b6 Rf8 10.Rb7 Kd7 11.Rb8 Rc8 12.Rxc8 Kxc8 13.Kf4 g5+ 14.Kxg5 d4 15.Kg4 e5
± (1.23) Depth: 23/61 00:02:06 879044kN
1.c6 hxg6 2.Rc3 d5 3.a4 bxa4 4.b5 a3 5.Rxa3 Kf7 6.Ra7+ Kf6 7.Ke3 Ke5 8.c7 Kd6 9.b6 Rf8 10.Rb7 Kd7 11.Rb8 Rc8 12.Kf4 g5+ 13.Ke5
± (1.23) Depth: 24/61 00:02:54 1184566kN
(, Microsoft 26.03.2010)