Author: Howard Exner
Date: 15:53:46 12/29/00
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On December 29, 2000 at 12:00:41, Uri Blass wrote: >This position is similiar to the position that crafty had no problem to solve > >[D]R7/8/6k1/4n3/5p2/5P2/5r1p/7K b - - 0 1 > >The test is to avoid Nxf3 that is leading to a draw. >Another test is to see the draw after Nxf3. Again I tested Tiger13, Century3 and Crafty17.14. In the original where Kf5 was the best move Crafty's time was 1:16, Rebel's was 8:42 and Tiger's was unsolved after 10 minutes. For this revised position Rebel is 2:55, Crafty 6:20, and Tiger unsolved after 10 minutes. Athlon 900. None post a draw score. Crafty's score cange from Nxf3 to Rxf3 is a miniscule .01 00:02:59.4 -7.26 15 77073974 Nxf3 Ra6+ Kg5 Rg6+ Kf5 Rf6+ Ke5 Rf5+ Kd6 Rf6+ Kc5 Rf5+ Kb6 Rf6+ Kb5 Rf5+ Ka6 Rf6+ Kb7 Rf7+ Kc6 Rf6+ Kd5 Rxf4 00:06:20.5 -7.27 15 208372603 Rxf3 Kxh2 Ng4+ Kg2 Rg3+ Kh1 Rd3 Rg8+ Kh5 Rh8+ Kg5 Rg8+ Kh4 Re8 Kg3 Re1 Nf2+ Kg1 Nh3+ Kf1 f3 Rebel's is a greater change of about 1.00. Can get the exact numbers if you want. Might a clue to handling this position be reducing the eval when detecting that the defending side can check perform rook checks directly beside the enemy king ( ie checking Rf6 when the king is on f5) over a series of checks? Playing the odds as I'm sure there are exceptions when the king can move to a spot where the perpetual checks cease, but usually these draws hold up.
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