Author: Vincent Diepeveen
Date: 09:03:35 01/22/04
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On January 21, 2004 at 17:10:20, Drexel,Michael 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# > >That is a basic endgame. I would win that in my sleep. > >Michael Sure, i drew KRPP KR with the KR side 2 times in 2002 in a 120 0 game in my club. One time opponent had pawns on e2,f3 the other time there were pawns on f and g. So connected passers. Not f + h, they all know that too well to be a draw. One opponent has a rating of 2220 (Robert Beekman) the other is FM (Pieter Nieuwenhuis). Neither of them was in time trouble... KRPP KR is a very useful EGTB. Of course guys like Haworth & co are too bad chessplayers to select interesting positions from such EGTBs, can't blame them. The conclusion is trivial however that chessprograms do a better job there with connected passers than humans, because the way to draw it is like a 10 ply combination which even in blitz happens. However the problems computers have is with for example f + h pawns. I'm sure most programs say it's +3.0 or so but in reality it's a simple draw. The interesting positions are not the 6 men themselves, but exchanging *into* them. That's why win/draw/loss egtbs are very useful for those who do not have 2 terabyte of storage space for the 6 men but only a few gigabyte.
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