Author: Mike Byrne
Date: 21:52:21 02/19/06
Question asked by Ed Schröder on January 09, 1998 - (obviously I just Ed's old post as a segue into introducing what the new "Crafty" can do - I don't think Ed really expects answer 8 years later ;>) . http://chessprogramming.org/cccsearch/ccc.php?art_id=13836 "I am busy to release some new EPD test sets in the Rebel9 subscription area. One the EPD sets is a 200 positions selection from the Austrian Modul magazine with lots of funny old stuff. I then came across the following cool "mate in 18(?)" position: [Event "?"] [Site "3/93-51 Matt in wieviel?"] [Date "1992.01.01"] [Round "?"] [White "Kristian Skoeld: Sc"] [Black ""] [Result "1-0"] [WhiteElo "?"] [BlackElo "?"] [FEN "[d]1r4r1/3q1npk/2b1pbnp/Rp1p4/1N1P3P/2PQ1pP1/1K3B2/5B1R w - - 0 1"] 1. Qxg6+ Kxg6 2. Bd3+ Kh5 3. g4+ Kxg4 4. Rg1+ Kf4 5. Bg3+ Kg4 6. Be1+ Kh3 7. Bf1+ Kh2 8. Bg3+ Kxg1 9. Ra1 Ra8 10. Rc1 Ra1 11. Kxa1 Qa7+ 12. Kb2 Qa1+ 13. Kxa1 Ra8+ 14. Na2 Rxa2+ 15. Kxa2 Bg5 16. hxg5 f2 17. Bh3+ f1=Q 18. Rxf1# 1-0 I have tried Rebel9 for a few minutes but it didn't find the mate. The usual killers (quiet moves) here are: 9.Ra1 10.Rc1 and especially 16.hxg5 f2 Any program?" ===================================================== FEN: 1r4r1/3q1npk/2b1pbnp/Rp1p4/1N1P3P/2PQ1pP1/1K3B2/5B1R w - - 0 1 Crafty-20.3: 1 00:00 275 275 -5.34 1.Nxc6 Qxc6 2.Qxf3 1 00:00 320 320 -5.34 1.Nxc6 Qxc6 2.Qxf3 2 00:00 405 405 -5.34 1.Nxc6 Qxc6 2.Qxf3 2 00:00 1.040 1.040 -4.94 1.h5 2 00:01 1.229 1.229 -3.99 1.h5 Bxd4 2.Qxd4 2 00:01 1.470 1.470 -3.99 1.h5 Bxd4 2.Qxd4 3 00:01 1.662 1.662 -3.59 1.h5 3 00:01 1.883 1.883 -3.53 1.h5 Ra8 2.Qxg6+ 3 00:01 2.777 2.777 -3.53 1.h5 Ra8 2.Qxg6+ 4 00:01 3.084 3.084 -3.13 1.h5 4 00:01 4.927 4.927 -3.04 1.h5 Nfe5 2.hxg6+ 4 00:01 6.925 6.925 -3.03 1.Nxc6 Qxc6 2.h5 Ra8 3.Qxg6+ 4 00:01 7.638 7.638 -3.03 1.Nxc6 Qxc6 2.h5 Ra8 3.Qxg6+ 5 00:01 10.619 10.619 -2.63 1.Nxc6 5 00:01 14.850 14.850 -2.61 1.Nxc6 Qxc6 2.h5 Rbc8 3.Qxg6+ 5 00:01 18.535 1.853.500 -2.43 1.h5 Kh8 2.Nxc6 Qxc6 3.hxg6 Ng5 5 00:01 22.489 2.248.900 -2.43 1.h5 Kh8 2.Nxc6 Qxc6 3.hxg6 Ng5 6 00:01 37.666 3.766.600 -2.33 1.h5 Ng5 2.hxg6+ Kh8 3.Nxc6 Qxc6 4.Ka1 6 00:01 57.592 1.919.733 -2.33 1.h5 Ng5 2.hxg6+ Kh8 3.Nxc6 Qxc6 4.Ka1 7 00:01 132.156 1.468.400 -2.76 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgc8 4.Nxc6 Rxc6 7 00:01 192.307 1.282.046 -2.76 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgc8 4.Nxc6 Rxc6 8 00:01 271.018 1.231.900 -2.39 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgc8 4.Bg4 Qd8 5.Nxc6 Rxc6 8 00:01 373.708 1.334.671 -2.39 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgc8 4.Bg4 Qd8 5.Nxc6 Rxc6 9 00:01 626.925 1.333.882 -2.77 1.h5 Ng5 2.Qxg6+ Kh8 3.Ra7 Qxa7 4.Nxc6 Qb7 5.Nxb8 Rxb8 9 00:01 1.239.286 1.376.984 -2.77 1.h5 Ng5 2.Qxg6+ Kh8 3.Ra7 Qxa7 4.Nxc6 Qb7 5.Nxb8 Rxb8 10 00:02 1.816.870 1.386.923 -2.66 1.h5 Ng5 2.Qxg6+ Kh8 3.Bd3 Ne4 4.Nxc6 Qxc6 5.Bxe4 dxe4 6.Rha1 10 00:02 2.259.213 1.394.575 -2.66 1.h5 Ng5 2.Qxg6+ Kh8 3.Bd3 Ne4 4.Nxc6 Qxc6 5.Bxe4 dxe4 6.Rha1 11 00:03 3.649.386 1.409.029 -2.79 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgf8 4.Bg4 Ne4 5.Qxf3 Bxd4 6.Rxh6+ gxh6 7.Bxd4+ 11 00:07 9.523.315 1.269.775 -2.79 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgf8 4.Bg4 Ne4 5.Qxf3 Bxd4 6.Rxh6+ gxh6 7.Bxd4+ 12 00:09 11.651.526 1.294.614 -2.70 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgf8 4.Bg4 Ne4 5.Rh2 Nxf2 6.Rxf2 Bd8 7.Nxc6 Qxc6 12 00:13 17.697.065 1.361.312 -2.70 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgf8 4.Bg4 Ne4 5.Rh2 Nxf2 6.Rxf2 Bd8 7.Nxc6 Qxc6 13 00:18 25.879.330 1.437.740 -2.95 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Nxh3 4.Rxh3 e5 5.Nxc6 Qxh3 6.Nxb8 Qg2 7.Qc2 Rxb8 13 01:13 107.758.666 1.476.146 -2.95 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Nxh3 4.Rxh3 e5 5.Nxc6 Qxh3 6.Nxb8 Qg2 7.Qc2 Rxb8 14 04:08 373.594.147 1.506.428 -2.83 1.h5 Ng5 2.hxg6+ Kh8 3.Be3 Rgf8 4.Bf4 Rbc8 5.Qe3 Kg8 6.Nxc6 Qxc6 7.Bxb5 Qb6 8.Rha1 14 11:53 1.125.650.669 1.578.752 -2.55 1.Qxg6+ 14 12:48 1.215.276.231 1.582.390 -1.55 1.Qxg6+ 14 14:49 1.414.167.447 1.590.739 +0.27 1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rb1 Ra1 9.Kxa1 Ra8+ 10.Kb2 Ra1 11.Rxa1 Qa7 12.Rxa7 Kxf1 13.Nxc6 Kg2 14 15:03 1.437.308.127 1.591.703 +0.27 1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rb1 Ra1 9.Kxa1 Ra8+ 10.Kb2 Ra1 11.Rxa1 Qa7 12.Rxa7 Kxf1 13.Nxc6 Kg2 15 17:42 1.699.693.043 1.600.464 +0.67 1.Qxg6+ 15 21:17 2.050.893.952 1.606.025 +1.67 1.Qxg6+ 15 23:49 2.302.755,245 1.611 +3.67 1.Qxg6+ 15 35:21 3.527.146,816 1.662 +M15 1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rb1 Ra1 9.Kxa1 Qa7+ 10.Kb2 Qa1+ 11.Kxa1 Ra8+ 12.Kb2 Ra1 13.Kxa1 f2 14.Bh3+ f1Q 15.Rxf1+ 15 35:33 3.547.613,353 1.663 +M15 1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rb1 Ra1 9.Kxa1 Qa7+ 10.Kb2 Qa1+ 11.Kxa1 Ra8+ 12.Kb2 Ra1 13.Kxa1 f2 14.Bh3+ f1Q 15.Rxf1+ Note: This version has been slightly tweaked from Bob's original 20.3 source. More testing needs to be performed - specifically does it play better than standard Crafty 20.3. One can see that the tweaked version above saw Qxg6 about 500M nodes quicker than standard. Standard Crafty 20.3: 1 00:00 275 275 -5.34 1.Nxc6 Qxc6 2.Qxf3 1 00:00 320 320 -5.34 1.Nxc6 Qxc6 2.Qxf3 2 00:00 405 405 -5.34 1.Nxc6 Qxc6 2.Qxf3 2 00:00 992 992 -4.94 1.h5 2 00:00 1.158 1.158 -3.94 1.h5 2 00:00 1.359 1.359 -3.91 1.h5 Bxd4 2.Qxd4 2 00:00 1.590 1.590 -3.91 1.h5 Bxd4 2.Qxd4 3 00:00 1.780 1.780 -3.51 1.h5 3 00:00 2.001 2.001 -3.45 1.h5 Ra8 2.Qxg6+ 3 00:00 2.795 2.795 -3.45 1.h5 Ra8 2.Qxg6+ 4 00:00 3.138 3.138 -3.05 1.h5 4 00:00 5.314 265.700 -2.23 1.h5 Kh8 2.Nxc6 Qxc6 3.Qxg6 4 00:00 6.806 340.300 -2.23 1.h5 Kh8 2.Nxc6 Qxc6 3.Qxg6 5 00:00 9.145 457.250 -2.43 1.h5 Kh8 2.Nxc6 Qxc6 3.hxg6 Ng5 5 00:00 13.819 690.950 -2.43 1.h5 Kh8 2.Nxc6 Qxc6 3.hxg6 Ng5 6 00:00 44.768 895.360 -2.39 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgc8 4.Bg4 Qd8 5.Nxc6 Rxc6 6 00:00 68.611 1.143.516 -2.39 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgc8 4.Bg4 Qd8 5.Nxc6 Rxc6 7 00:00 110.756 1.107.560 -2.39 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgc8 4.Bg4 Qd8 5.Nxc6 Rxc6 7 00:00 147.820 1.343.818 -2.39 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgc8 4.Bg4 Qd8 5.Nxc6 Rxc6 8 00:00 281.949 1.342.614 -2.33 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Ra8 4.Rxa8 Rxa8 5.Bg4 Ne4 6.Qxf3 8 00:00 409.516 1.365.053 -2.33 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Ra8 4.Rxa8 Rxa8 5.Bg4 Ne4 6.Qxf3 9 00:01 1.030.089 1.392.012 -2.69 1.h5 Kh8 2.Qxg6 Ng5 3.Ra7 Qxa7 4.Nxc6 Qb7 9 00:02 2.849.808 1.432.064 -2.69 1.h5 Kh8 2.Qxg6 Ng5 3.Ra7 Qxa7 4.Nxc6 Qb7 10 00:03 4.796.942 1.440.523 -2.70 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgf8 4.Bg4 Ne4 5.Rh2 Nxf2 6.Rxf2 Bd8 7.Nxc6 Qxc6 10 00:05 7.882.236 1.370.823 -2.70 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgf8 4.Bg4 Ne4 5.Rh2 Nxf2 6.Rxf2 Bd8 7.Nxc6 Qxc6 11 00:07 9.901.191 1.414.455 -2.70 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgf8 4.Bg4 Ne4 5.Rh2 Nxf2 6.Rxf2 Bd8 7.Nxc6 Qxc6 11 00:12 18.103.368 1.448.269 -2.70 1.h5 Ng5 2.hxg6+ Kh8 3.Bh3 Rgf8 4.Bg4 Ne4 5.Rh2 Nxf2 6.Rxf2 Bd8 7.Nxc6 Qxc6 12 00:26 38.233.250 1.470.509 -3.00 1.h5 Kh8 2.Qxg6 Ng5 3.Bd3 Rgc8 4.Rha1 Ra8 5.Be3 Rxa5 6.Rxa5 Ne4 7.Bxh6 f2 12 01:48 162.992.484 1.509.189 -3.00 1.h5 Kh8 2.Qxg6 Ng5 3.Bd3 Rgc8 4.Rha1 Ra8 5.Be3 Rxa5 6.Rxa5 Ne4 7.Bxh6 f2 13 02:20 211.470.494 1.510.503 -3.00 1.h5 Kh8 2.Qxg6 Ng5 3.Bd3 Rgc8 4.Rha1 Ra8 5.Be3 13 06:35 600.649.945 1.520.632 -3.00 1.h5 Kh8 2.Qxg6 Ng5 3.Bd3 Rgc8 4.Rha1 Ra8 5.Be3 14 12:14 1.118.633.431 1.524.023 -2.78 1.h5 Ng5 2.hxg6+ Kh8 3.Be3 Rgf8 4.Bf4 Rbc8 5.Rh2 Be7 6.Nxc6 Rxc6 7.Qxb5 Ne4 8.Ra7 Qxa7 9.Qxc6 14 18:09 1.695.422.254 1.556.861 -2.60 1.Qxg6+ 14 19:15 1.801.492.638 1.559.733 -1.60 1.Qxg6+ 14 21:10 1.987.657.603 1.565.084 +0.40 1.Qxg6+ 14 21:22 2.007.473.524 1.565.891 +0.40 1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rd1 Ra1 9.Rxa1 Qa7 10.Rc1 Qa1+ 11.Kxa1 Ra8+ 12.Kb2 Ra1 13.Rxa1 Bd7 14 21:46 2.046.198.353 1.566.767 +0.40 1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rd1 Ra1 9.Rxa1 Qa7 10.Rc1 Qa1+ 11.Kxa1 Ra8+ 12.Kb2 Ra1 13.Rxa1 Bd7 15 24:33 2.319.268,958 1.573 +0.80 1.Qxg6+ 15 27:22 2.592.540,190 1.578 +1.80 1.Qxg6+ 15 29:30 2.803.042,392 1.583 +3.80 1.Qxg6+ ------------------------------------- There are other programs faster in finding mate above, I'm just currently focussed on Crafty for the CCT8 tournament next weekend.
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