Author: blass uri
Date: 12:23:11 10/02/98
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On October 02, 1998 at 13:12:02, Robert Hyatt wrote: > >In this position. crafty says Be4+ Mat34, with a 2 second search. How did >it do that? like this: > > 8 2.03 Mat34 1. Be4+ Ka7 2. Bxb8+ Ka6 3. Bb7+ Qxb7 > 4. Rxb7 Kxb7 > 8-> 3.27 Mat34 1. Be4+ Ka7 2. Bxb8+ Ka6 3. Bb7+ Qxb7 > 4. Rxb7 Kxb7 > >What it did was to search deeply enough to see that it could trade bishop >and rook for the opponent's rook and queen, leaving it in a KBN vs K position. >And after searching the 8 plies into the future (as it did above) it then found >the endgame database position and said "aha, Mate in N from this point." > >This is why my current version (15.21) won't play Rxb2, because it can see >deeply enough into the future to see the white king eating the black pawns >and that gives "mate in N". If it could see this then without tablebases the evaluation was instead of -0.xx big advantage for white because it could not see the mate but could see the position of KPP against K Or in some variations it sees one black and one >white pawn being traded, and that also leads to mate in N. I do not think that there are logical lines to go to KP against KP in the example that I gave Uri
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