Author: Dann Corbit
Date: 00:38:39 11/21/00
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On November 21, 2000 at 03:36:38, Jeremiah Penery wrote: >On November 21, 2000 at 03:21:54, Dann Corbit wrote: > >>I have a machine with lots of memory and lots of tablebase files. Running >>ExChess 4.01 on that machine with 100 megs hash and all 5 + some 6 piece >>tablebase files gave this: >> >>[D]1k6/5RP1/1P6/1K6/6r1/8/8/8 w - - bm Ka5 Kc5; id "WAC.041"; > >It appears that b7 is a mate in 18. > >19-> 1:34 Mat18 1. b7 Rg5+ 2. Kc6 Rg6+ 3. Kd5 Rg5+ > 4. Ke6 Rg6+ 5. Kf5 Rg1 6. Rf8+ Kxb7 > <HT> > >It first found mate in 23, then 21, 20, and 18. So it could go down again, but >I doubt it. > >However, Ka5 seems to be a mate in 15, and Kc5 a mate in 17. > >15-> 1:14 Mat15 1. Ka5 Rg1 2. Rf8+ Kb7 3. g8=Q Ra1+ > 4. Kb4 Rb1+ 5. Qb3 Rxb3+ <HT> > >15-> 1:06 Mat17 1. Kc5 Rg5+ 2. Kb4 Rg4+ 3. Ka5 Rg1 > 4. Rf8+ Kb7 5. g8=Q <HT> In any case, b7 must be added. Any move that provably leads to checkmate is just as good or better than any other choice. The EPD test suite must be amended. If your program chooses b7, that is a correct choice.
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