Author: Uri Blass
Date: 06:47:43 12/26/02
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On December 26, 2002 at 09:37:18, Vladimir Medvedev wrote: >>How long does your program need to avoid Qxf1? >> >>[D] 1kr5/pp2bNp1/1qb1p3/3n4/P2PN3/1p1B2P1/1B2Q3/R4rK1/w - - ;am Qxf1 >> >>In IsiChess some queen-pinned knowledge was helpfull. >>4 seconds to avoid Qxf1 on AMD XP 2.1+ 256MB Hash. > >GreKo changes it's mind at depth 9, after 33 seconds. >Hardware: Pentium-III, 600 MHz, 64 MB Hash. >It knows nothing about pinning. > > > 1 33 0 255 1. Qxf1 Rf8 White(1): > 2 43 2 1169 1. Qxf1 Rf8 2. Qf2 > 3 24 5 4038 1. Qxf1 Rf8 2. Qf2 Qc7 > 4 42 26 26720 1. Qxf1 Rf8 2. Bb5 Nc7 3. Bd3 > 5 42 81 93746 1. Qxf1 Rf8 2. Bb5 Nc7 3. Bd3 > 6 26 128 148951 1. Qxf1 Rf8 2. Qf2 Qb4 3. Nc5 Bf6 > 7 22 416 496575 1. Qxf1 Rf8 2. Be2 Qb4 3. Bb5 a6 4. Bxc6 bxc6 > 8 16 3298 3580934 1. Rxf1 Bxa4 2. Ned6 Rc6 3. Ne8 Rc2 4. Qe5+ Ka8 5. >Bxc2 bxc2 > 9 -10 7639 8506587 1. Rxf1 Bxa4 2. Neg5 Rc6 3. Ne5 Rc2 4. Bxc2 bxc2 5. >Nc4 Bb5 Based on the analysis it changed it's mind at depth 8 but not all the analysis is printed. I see no score for Qxf1 at depth 8 Note that movei has knowledge about pins(it knows to extend in the qsearch when the queen is pinned) but I think that the knowledge that is needed is different and I see no line when the queen is pinned but only pin of the knight to the queen(movei only knows about pins to the king). Uri
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