What engine can see the best move Bf8+!

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pichy
Posts: 2564
Joined: Thu Mar 09, 2006 2:04 am

Re: What engine can see the best move Bf8+!

Post by pichy » Sun Apr 22, 2012 11:33 pm

Houdini wrote:[D]6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - - 0 1
Jorge, interesting position. It's actually not about "horizon effect" or "superiority in long term calculation", this is a zugzwang problem which may cause a problem to engines because of null moves.
Here's Houdini's take, using 3 threads on a Core i5-750:

Code: Select all

6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - -

Engine: Houdini DEV 3T (2048 MB)
by Robert Houdart

4/14   0:00   0.00     1.Be5 Kh7 2.Rg7+ Kh6 3.Rg8 Kh7 (1.369) 
...
11/24  0:00   -0.14    1.Rf8 Qe1 2.Bxf4+ Kg6 3.Re8 Qc3 
                       4.Bd6 Qc4 5.Re4 Qa2 6.Kf2 Kf5 7.Re5+ Kg6 (98.576) 3520 
...
22/43  0:02   0.00     1.Rf8 Qe1 2.Bxf4+ Kg6 3.Re8 Qc3 
                       4.Bd6 Qc4 5.e4 Qe2+ 6.Kg3 Qe1+ 7.Kg2 Qe3 
                       8.Re6+ Kf7 9.Re7+ Kf6 10.Re5 Qe2+ 
                       11.Kg3 Qe1+ 12.Kg2 Qd2+ 13.Kg3 Kg6 
                       14.Re6+ (14.155.617) 6553 
...
32/59  0:39   0.00     1.Rf8 Qe1 2.Bxf4+ Kg6 3.Re8 Qc3 
                       4.Bd6 Qc4 5.e4 Qe2+ 6.Kg3 Qe1+ 7.Kg2 Qe3 
                       8.Re6+ Kf7 9.Re7+ Kf6 10.Re5 Qe2+ 
                       11.Kg3 Qe1+ 12.Kf4 Qc1+ 13.Kg3 Qg1+ 
                       14.Kf4 (275.723.867) 6897 

32/60  0:52   +0.04++  1.Bf8+ (364.867.951) 6992 

32/60  0:54   +0.14++  1.Bf8+ (380.915.045) 7013 

32/64  0:56   +0.37++  1.Bf8+ (399.304.568) 7033 

32/66  0:59   +1.17++  1.Bf8+ (422.345.062) 7056 

32/66  1:04   +4.25++  1.Bf8+ (455.314.294) 7102 

32/79  1:49   +12.34++ 1.Bf8+ (858.348.298) 7844 

32/81  1:50   +12.31   1.Bf8+ Kh7 2.Rg7+ Kh8 3.Be7 Qe1 
                       4.Bf6 Qxe2+ 5.Kh1 Qc4 6.Ba1 h4 7.Bf6 Qe6 
                       8.Bd4 Qc4 9.Ba1 h3 10.Bf6 Qe6 11.Bd4 Qh6 
                       12.Rg6+ Kh7 13.Rxh6+ Kxh6 14.Kh2 (871.642.788) 7852 

33/81  1:53   +12.31   1.Bf8+ Kh7 2.Rg7+ Kh8 3.Be7 Qe1 
                       4.Bf6 Qxe2+ 5.Kh1 Qc4 6.Ba1 h4 7.Bf6 Qe6 
                       8.Bd4 Qc4 9.Ba1 h3 10.Bf6 Qe6 11.Bd4 Qh6 
                       12.Rg6+ Kh7 13.Rxh6+ Kxh6 14.Kh2 (895.335.546) 7862 
How many human players would find a win in this position in less than a minute?

Critter can also see it immediately:

FEN: 6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - - 0 1

Critter_1.4_32bit:
2/4 00:00 196 0 -0.53 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8
3/6 00:00 448 11.200 -0.55 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7
4/7 00:00 708 17.268 -0.88 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Rg7g6 Qh4e1
5/10 00:00 2.378 43.236 -1.22 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Rg7g6 Qh4e1 Bf8g7+ Kh8h7
6/10 00:00 4.570 73.709 -1.70 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Rg7e7 Kh8g8 Re7e8 Kg8f7
6/10 00:00 6.381 96.681 -1.22 Kg2f1 Qh4f6 Rg8a8 Qf6f5 Ra8g8 Qf5h3+ Kf1e1
7/10 00:00 8.266 121.558 -1.24 Kg2f1 Qh4f6 Rg8a8 Qf6f5 Ra8g8 Kh6h7 Rg8g1
7/12 00:00 11.819 166.464 -0.59 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1g1 Kh6g6 Bd6xf4 Qh3e6 e2e4
8/12 00:00 13.192 183.222 -0.60 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1g1 Kh6g6 Bd6xf4 Qh3e6 Kg1f2 h5h4
9/16- 00:00 19.779 253.576 -0.68 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1g1 Kh6g6 Bd6xf4 Qh3e6 Kg1f2 h5h4
9/16- 00:00 23.621 291.617 -0.77 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1g1 Kh6g6 Bd6xf4 Qh3e6 Kg1f2 h5h4
9/16 00:00 26.227 315.987 -0.57 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Qh3h2+ Kf2f1 Qh2h1+ Kf1f2 Kh6g6 Bd6xf4 Qh1h4+ Kf2g2 Qh4e7 Rf8g8+ Kg6h7
10/17 00:00 32.910 223.877 -0.60 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Qh3h2+ Kf2f1 Qh2h1+ Kf1f2 Kh6g6 Bd6xf4 Qh1h4+ Kf2f1 Qh4e7 Bf4d6
11/18 00:00 46.373 284.496 -0.58 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Qh3h2+ Kf2f1 Qh2h1+ Kf1f2 Kh6g6 Bd6xf4 Qh1h4+ Kf2f1 Qh4e7 Bf4d6 Qe7e6
12/20 00:00 84.768 446.147 -0.57 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Kh6g6 Bd6xf4 Qh3h4+ Kf2f1 Qh4e7 Rf8g8+ Kg6f7 Bf4d6 Qe7e6 Rg8a8 h5h4
13/23 00:00 167.293 708.868 -0.50 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Kh6g6 Bd6xf4 Qh3h4+ Kf2f1 Qh4e7 Rf8g8+ Kg6f7 Bf4d6 Qe7e6 Rg8h8 Qe6d5 Kf1g2 Kf7g6 e2e4 Qd5d2+ Kg2g3
14/25 00:00 354.276 1.103.663 -0.48 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Kh6g6 Rf8xf4 Qh3h2+ Kf2f1 Qh2h1+ Kf1f2 Qh1a1 Bd6e7 Qa1g7 Rf4e4 Qg7f7 Be7d6 Qf7a2 Bd6e5 Qa2d2 Be5d4
15/25 00:00 452.955 1.237.581 -0.49 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Kh6g6 Rf8xf4 Qh3h2+ Kf2f1 Qh2h1+ Kf1f2 Qh1a1 Bd6e7 Qa1g7 Rf4e4 Qg7f7 Be7d6 Qf7a2 Bd6e5 Qa2d5 Be5d6 Qd5a2
16/28 00:00 694.431 1.506.357 -0.48 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Kh6g6 Rf8xf4 Qh3h2+ Kf2f1 Qh2h1+ Kf1f2 Qh1a1 Bd6e7 Qa1g7 Rf4e4 Qg7f7 Re4e5 Qf7c4 Re5e4 Qc4d5 Re4f4 Kg6h6
17/37 00:00 932.207 1.685.726 -0.48 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Kh6g6 Rf8xf4 Qh3h2+ Kf2f1 Qh2h1+ Kf1f2 Qh1a1 Bd6e7 Qa1g7 Rf4e4 Qg7f7 Re4e5 Qf7c4 Re5e4 Qc4d5 Re4f4 Kg6h6
18/39 00:01 2.637.371 2.145.948 -0.45 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Kh6g6 Rf8xf4 Qh3e6 Rf4e4 Qe6f5 Re4a4 Qf5d5 Ra4f4 Qd5e6
19/39 00:01 3.515.835 2.218.192 -0.45 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Kh6g6 Rf8xf4 Qh3e6 Rf4a4 Qe6d5 Ra4f4 Qd5a2 Bd6e5 Kg6g5 Rf4d4 Qa2c2 Be5d6 Kg5f5 Rd4e4 Qc2a2 Re4f4+ Kf5g5 Rf4e4 Kg5g6 Re4d4 Qa2b2 Rd4h4 Qb2g7 Rh4e4 Qg7g8 Bd6e7 Qg8f7 Be7d6 Qf7g8
20/39 00:02 4.670.583 2.331.793 -0.45 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Kh6g6 Rf8xf4 Qh3e6 Rf4a4 Qe6d5 Ra4f4 Qd5a2 Bd6e5 Kg6g5 Rf4d4 Qa2c2 Be5d6 Kg5f5 Rd4f4+ Kf5g6 Rf4d4 Qc2c3 Rd4e4 Qc3b3 Bd6e5 Qb3g8 Be5d6 Qg8a2 Re4d4 Qa2b2 Rd4h4 Qb2g7 Rh4e4 Qg7g8 Bd6e7 Qg8f7 Be7d6 Qf7g8
21/39 00:02 6.733.769 2.419.607 -0.45 Rg8f8 Qh4g3+ Kg2f1 Qg3h3+ Kf1f2 Kh6g6 Rf8xf4 Qh3e6 Rf4a4 Qe6d5 Ra4f4 Kg6g5 Rf4a4 Kg5f6 Ra4e4 Kf6f7 Re4h4 Kf7g7 Rh4a4 Kg7f7 Ra4e4 Kf7f6 Re4a4 Kf6g7 Ra4e4 Kg7h6 Re4h4 Kh6g7
21/39+ 00:06 16.823.717 2.861.176 -0.37 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Rg7e7 Kh8g8 Re7e8 Kg8f7
21/39+ 00:06 18.251.496 2.851.350 -0.15 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Rg7e7 Kh8g8 Re7e8 Kg8f7
21/40 00:07 19.894.884 2.871.248 0.00 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4f6 Qc4e6
22/40 00:07 21.569.130 2.875.500 0.00 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4f6 Qc4e6
23/43+ 00:10 29.058.725 2.897.180 +0.08 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4f6 Qc4e6
23/51+ 00:10 30.865.161 2.868.509 +0.17 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4f6 Qc4e6
23/67+ 00:17 49.296.466 2.898.428 +4.22 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4f6 Qc4e6
23/67 00:18 54.547.631 2.931.722 +4.81 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6h5 Kh1h2 Kh5g6 Bf6xh4 Kg6h6 Kh2h3 Kh6h5 Bh4e7 Kh5g6 Kh3g4 Kg6f7 Be7g5 Kf7e6 Bg5h4 Ke6d5 Kg4xf4 Kd5d4 Bh4f2+ Kd4d5 Kf4g5 Kd5e6 f3f4 Ke6e7 f4f5 Ke7f7 Bf2e1
24/67 00:19 55.325.350 2.929.126 +4.81 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4e7 Kh5h6 Kh1g2 Kh6g6 Kg2h2 Kg6h7 Be7d6 Kh7g6 Bd6xf4 Kg6g7 Bf4d6 Kg7f7 Kh2g3 Kf7g6 Kg3f4 Kg6f6 Kf4e4 Kf6e6 Ke4f4 Ke6d5 Kf4e3 Kd5e6 Ke3e4 Ke6f6 f3f4 Kf6e6 Bd6e5 Ke6e7 f4f5 Ke7f7 Be5d6 Kf7f6 Bd6e5+ Kf6f7
25/67 00:21 62.640.441 2.985.152 +5.06 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4e7 Kh5g6 Kh1h2 Kg6f7 Be7d6 Kf7f6 Kh2h3 Kf6g5 Bd6e5 Kg5f5 Be5c7 Kf5g5 Bc7d6 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6f7 Kg4xf4 Kf7f6 Bd6e5+ Kf6f7 Kf4f5 Kf7e7 Be5d6+ Ke7f7 f3f4 Kf7g7 Kf5e5 Kg7f7 f4f5
26/67 00:22 67.454.191 3.024.444 +5.06 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4e7 Kh5g6 Kh1h2 Kg6f7 Be7d6 Kf7f6 Kh2h3 Kf6g5 Bd6e5 Kg5f5 Be5c7 Kf5g5 Bc7d6 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6f7 Kg4xf4 Kf7f6 Kf4e4 Kf6f7 Ke4f5 Kf7g7 f3f4 Kg7f7 Kf5e5 Kf7g6 f4f5+ Kg6f7 f5f6
27/67 00:26 80.669.762 3.107.583 +5.08 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4f2 Kh5h6 Kh1g2 Kh6h5 Bf2d4 Kh5g5 Kg2h3 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6d5 Bd4f2 Kd5e5 Kg4g5 Ke5e6 Kg5xf4 Ke6f6 Bf2e1 Kf6e6 Kf4e4 Ke6f6 f3f4 Kf6e6 Be1f2 Ke6f7 f4f5 Kf7e7 Bf2d4 Ke7f7 Bd4c3 Kf7f8 Bc3e1
28/67 00:28 91.299.108 3.168.677 +5.08 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4f2 Kh5h6 Kh1g2 Kh6h5 Bf2d4 Kh5g5 Kg2h3 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6d5 Bd4f2 Kd5c4 Kg4xf4 Kc4d5 Kf4g5 Kd5e6 f3f4 Ke6e7 f4f5 Ke7f7 Bf2g3 Kf7g7 Bg3e5+ Kg7f7 f5f6 Kf7f8 Be5d6+ Kf8f7 Kg5f5
29/67 00:32 105.719.689 3.218.745 +5.08 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4f2 Kh5h6 Kh1g2 Kh6h5 Bf2d4 Kh5g5 Kg2h3 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6d5 Bd4f2 Kd5e5 Kg4g5 Ke5e6 Kg5xf4 Ke6f6 Kf4g4 Kf6e6 f3f4 Ke6f6 f4f5 Kf6f7 Bf2h4 Kf7g7 Kg4g5 Kg7f7 Bh4g3 Kf7g7 Bg3e5+ Kg7f7 f5f6 Kf7f8 Be5d6+ Kf8f7 Kg5f5
30/67 00:38 125.779.545 3.301.040 +5.08 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4f2 Kh5h6 Kh1g2 Kh6h5 Bf2d4 Kh5g5 Kg2h3 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6d5 Bd4f2 Kd5e5 Kg4g5 Ke5e6 Kg5xf4 Ke6f6 Kf4g4 Kf6e6 f3f4 Ke6f6 f4f5 Kf6f7 Bf2h4 Kf7g7 Kg4g5 Kg7f7 Bh4g3 Kf7g7 Bg3e5+ Kg7f7 f5f6 Kf7f8 Be5d6+ Kf8f7 Kg5f5
31/67+ 00:47 158.354.350 3.321.050 +5.40 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4f2 Kh5h6 Kh1g2 Kh6h5 Bf2d4 Kh5g5 Kg2h3 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6d5 Bd4f2 Kd5e5 Kg4g5 Ke5e6 Kg5xf4 Ke6f6 Bf2h4+ Kf6e6 Kf4e4 Ke6d7 Ke4e5 Kd7c7 Bh4e1 Kc7c8 f3f4
31/72+ 00:58 188.569.424 3.252.991 +5.72 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4f2 Kh5h6 Kh1g2 Kh6h5 Bf2d4 Kh5g5 Kg2h3 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6d5 Bd4f2 Kd5e5 Kg4g5 Ke5e6 Kg5xf4 Ke6e7 Kf4g4 Ke7f7 f3f4 Kf7f6 f4f5 Kf6f7 Kg4f4 Kf7f6 Bf2h4+ Kf6g7 f5f6+ Kg7f7 Kf4g4 Kf7e6 Kg4f4 Ke6f7
31/72+ 01:14 237.672.562 3.214.528 +6.19 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4f2 Kh5h6 Kh1g2 Kh6h5 Bf2d4 Kh5g5 Kg2h3 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6d5 Bd4f2 Kd5e5 Kg4g5 Ke5e6 Kg5xf4 Ke6e7 Kf4g4 Ke7e6 Kg4g5 Ke6f7 Kg5f5 Kf7e7 Bf2h4+ Ke7e8 f3f4 Ke8f7 Bh4f2 Kf7e8 Kf5f6 Ke8f8 Kf6g5 Kf8g7 Kg5f5 Kg7f7 Kf5e5 Kf7g6 Bf2h4 Kg6h6 Ke5d6 Kh6g6 Kd6xc6 Kg6f5
31/74+ 01:49 354.495.804 3.235.454 +6.90 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4f2 Kh5h6 Kh1g2 Kh6h5 Bf2d4 Kh5g5 Kg2h3 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6d5 Bd4f2 Kd5e5 Kg4g5 Ke5d5 Kg5xf4 Kd5e6 Kf4g5 Ke6f7 f3f4 Kf7g8 f4f5 Kg8f7 f5f6 Kf7f8 Kg5f5 Kf8f7 Bf2h4 Kf7e8 Kf5e5 Ke8f7 Bh4f2 Kf7f8 Ke5d6 Kf8e8 Bf2g3 Ke8f7 Bg3e5 Kf7f8 Kd6xc6 Kf8f7 Kc6d5
31/76+ 02:40 529.293.392 3.296.278 +7.96 Bd6f8+ Kh6h7 Rg8g7+ Kh7h8 Bf8e7 Qh4e1 Be7f6 Qe1xe2+ Kg2h1 Qe2e6 Bf6d4 Qe6c4 Bd4a1 h5h4 Ba1f6 Qc4e6 Bf6d4 Qe6h6 Rg7g6+ Kh8h7 Rg6xh6+ Kh7xh6 Bd4f6 Kh6g6 Bf6xh4 Kg6h5 Bh4f2 Kh5h6 Kh1g2 Kh6h5 Bf2d4 Kh5g5 Kg2h3 Kg5f5 Kh3h4 Kf5e6 Kh4g4 Ke6d5 Bd4f2 Kd5e5 Kg4g5 Ke5d5 Kg5xf4 Kd5e6 Bf2e1 Ke6e7 Kf4f5 Ke7e8 Kf5e5 Ke8f8 f3f4 Kf8g7 Be1f2 Kg7h7 Ke5e6 Kh7g7 Ke6e5

pichy
Posts: 2564
Joined: Thu Mar 09, 2006 2:04 am

Re: Komodo Finally solve this position

Post by pichy » Mon Apr 23, 2012 9:06 pm

pichy wrote:Why Komodo and Hannibal don’t find the best move in this position Bf8+!. This is a great position to show the horizon effect which most engine don’t see as winning immediately for White. This is where top GMs are superior to top engines in long term calculation and able to detect a position that will lead the human to win at the end by forcing Black into a Horizon effect in which Black will not be able to get out off.

[D]6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - - 0 1
FEN: 6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - - 0 1

[Event "?"]
[Site "?"]
[Date "2012.04.23"]
[Round "?"]
[White " Komodo64 SSE Version 4"]
[Black "Komodo64 SSE Version 4"]
[Result "*"]
[BlackElo "3040"]
[Time "16:13:16"]
[WhiteElo "3040"]
[TimeControl "0+10"]
[SetUp "1"]
[FEN "5BR1/8/2p4k/2P4p/5p1q/5P2/4P1K1/8 b - - 1 1"]
[Termination "normal"]
[PlyCount "31"]
[WhiteType "program"]
[BlackType "program"]

1. ...+ Kh7 2. Rg7+ Kh8 3. Be7 Qe1 4. Bf6 Qxe2+ 5. Kh1 Qc4 6. Ba1 h4 7. Bf6
h3 8. Ba1 h2 9. Bf6 Qe6 10. Bd4 Qh6 11. Rg6+ Kh7 12. Rxh6+ Kxh6 13. Be5 Kg6
14. Bb8 Kg5 15. Kxh2 Kf5 16. Kh3 Kg5 {Black resigns} *

Only after I entered Bf8+ manually, Komodo see the the winning lines :lol:

pichy
Posts: 2564
Joined: Thu Mar 09, 2006 2:04 am

Re: Komodo Finally solve this position

Post by pichy » Thu Apr 26, 2012 11:04 am

pichy wrote:
pichy wrote:Why Komodo and Hannibal don’t find the best move in this position Bf8+!. This is a great position which most engine don’t see as winning immediately for White since they don't support null pruning heuristic. This is where top GMs are superior to top engines in long term calculations.

[D]6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - - 0 1
FEN: 6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - - 0 1

[Event "?"]
[Site "?"]
[Date "2012.04.23"]
[Round "?"]
[White " Komodo64 SSE Version 4"]
[Black "Komodo64 SSE Version 4"]
[Result "*"]
[BlackElo "3040"]
[Time "16:13:16"]
[WhiteElo "3040"]
[TimeControl "0+10"]
[SetUp "1"]
[FEN "5BR1/8/2p4k/2P4p/5p1q/5P2/4P1K1/8 b - - 1 1"]
[Termination "normal"]
[PlyCount "31"]
[WhiteType "program"]
[BlackType "program"]

1. ...+ Kh7 2. Rg7+ Kh8 3. Be7 Qe1 4. Bf6 Qxe2+ 5. Kh1 Qc4 6. Ba1 h4 7. Bf6
h3 8. Ba1 h2 9. Bf6 Qe6 10. Bd4 Qh6 11. Rg6+ Kh7 12. Rxh6+ Kxh6 13. Be5 Kg6
14. Bb8 Kg5 15. Kxh2 Kf5 16. Kh3 Kg5 {Black resigns} *

Only after I entered Bf8+ manually, Komodo see the the winning lines :

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