Author: Robert Hyatt
Date: 10:17:38 01/22/04
Go up one level in this thread
On January 22, 2004 at 11:57:20, José de Jesús García Ruvalcaba wrote: >On January 21, 2004 at 17:02:30, Mike Hood wrote: > >>Here's a small example of "perfect play" using the KRPP-KR tablebase. It's not >>the only path that leads to mate, there are a few possible branches along the >>way, but there are no shorter paths. How many engines playing black without >>6-piece EGTBs could get a win against an engine playing white with 6-piece >>EGTBs? Not many, if any. Take a look >> >>[D] 3R4/6k1/8/6p1/7p/2r5/7K/8 b - - 0 63 >> >>63...Kg6 64. Rh8 Kf5 >>65. Rf8+ Kg4 66. Rd8 Rc2+ 67. Kg1 h3 68. Rd4+ Kg3 69. Rd3+ Kh4 70. Rd8 g4 71. >>Rd4 Kg3 72. Rd3+ Kf4 73. Rd4+ Kf3 74. Rd3+ Ke4 75. Rd8 g3 76. Re8+ Kf4 77. Rf8+ >>Ke5 78. Re8+ Kf6 79. Re1 Kg5 80. Rd1 Rf2 81. Rd5+ Kg4 82. Rd4+ Rf4 83. Rd2 h2+ >>84. Kg2 Rf2+ 85. Rxf2 gxf2 86. Kxf2 h1=Q 87. Ke3 Qd5 88. Ke2 Kf4 89. Kf1 Qa2 >>90. Ke1 Ke3 91. Kd1 Qb1# > >The win for black in this position is way too easy. I expect any top engine to >win it without tablebases against an opponent with tablebases. Of course it may >take quite a few more moves than the optimal win. Unfortunately I can not run >this experiment due to lack of resources. >José. I ran this test. First, this is a mate in 28 moves as given. at 1 sec/move (the crafty with no egtb) Crafty drew by playing the following variation: 1. ... h3 2. Rd6 g4? and now it is a dead draw as the tablebases prove. at 5 secs/move, it took the no-tablebase crafty 42 moves to deliver mate, rather than the optimal 28. Not a real problem as there were pawn pushes to make the 50 move rule a non-issue. at 10 secs/move it took 37 moves to deliver mate, 9 more than optimal. I suspect that it will get closer to optimal as the time per move goes up. SO the only danger in this position is a very fast search that can advance a pawn into a quick draw...
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