Author: Klaus Friedel
Date: 02:16:49 05/02/04
Go up one level in this thread
On May 02, 2004 at 05:09:15, Klaus Friedel wrote: >On May 01, 2004 at 22:51:55, Robert Hyatt wrote: > >>On May 01, 2004 at 01:41:52, Klaus Friedel wrote: >> >>>On April 30, 2004 at 23:04:24, Andrew Wagner wrote: >>> >>>>Here's the position: >>>> >>>>[d] 8/7p/5k2/5p2/p1p2P2/Pr1pPK2/1P1R3P/8 b - - >>>> >>>>The move to find here is Rxb2. My question is...what ply does your program find >>>>the solution on? To tactically work it out to see that you can force queening >>>>requires something like 13 or 14 ply. This is an interesting knowledge vs. >>>>search position...can you special-case this somehow to find it sooner? The >>>>problem is, as an FM friend of mine pointed out, if the king were just a bit >>>>closer, the sac is losing. E.g. In this position: >>>> >>>>[d] 8/7p/5k2/5p2/p1p2P2/Pr1p1K2/1P1R3P/8 b - - (white pawn missing on e3) >>>>...the sac would be losing because the king is close enough to stop the pawns. >>>>So my first inclination to somehow make the static eval see that the pawns were >>>>worth being down a pawn seems to be bad. Any thoughts? >>> >>>Snitch finds it at ply 9 >>> >>>I hava a special eval term "rook vs 2 connected pawns with king far away" >>>to help in such positions. >>> >>>Snitch0.3.57 WB2 35 MB: >>> 1 00:00 0,20 b3b2 >>> 1 00:00 1,78 b3b2 d2b2 f6g6 >>> 1 00:00 1,87 b3a3 >>> 2 00:00 1,72 b3a3 e3e4 >>> 2 00:00 1,78 b3b2 d2b2 f6g6 >>> 3 00:00 1,96 b3b2 d2b2 c4c3 >>> 4 00:00 1,66 b3b2 d2b2 c4c3 b2b7 f6g6 >>> 5 00:00 1,66 b3b2 d2b2 c4c3 b2b6 f6g7 b6b7 g7g6 >>> 5 00:00 1,78 f6f7 h2h3 b3b2 d2b2 c4c3 >>> 6 00:00 0,53 f6f7 e3e4 f7e6 f3e3 b3b7 e4e5 e6d5 >>> 6 00:00 1,15 b3b2 d2b2 c4c3 b2b6 f6g7 b6b7 g7g6 b7h7 g6h7 >>> 6 00:00 1,49 c4c3 b2c3 b3c3 e3e4 c3a3 f3e3 >>> 7 00:00 1,20 c4c3 b2c3 b3c3 e3e4 c3a3 e4e5 f6e6 f3e3 >>> 7 00:00 1,30 f6g6 >>> 8 00:01 0,51 f6g6 e3e4 b3b7 d2g2 g6f6 f3e3 f5e4 e3e4 b7e7 e4d4 >>> 8 00:01 0,67 b3b5 e3e4 f5e4 f3e4 b5b7 e4d4 b7c7 d4e4 c7e7 e4d5 >>> 8 00:01 0,80 b3b6 e3e4 f5e4 f3e4 b6e6 e4f3 h7h6 d2g2 e6e7 h2h4 f6f5 >>> 8 00:01 0,82 b3b7 e3e4 f5e4 f3e4 b7e7 e4d4 e7e2 >>> 9 00:01 0,95 b3b7 e3e4 f5e4 f3e4 b7e7 e4d4 e7e2 d2d1 e2c2 d1e1 c2e2 >>> 9 00:01 1,02 b3b2 >>> 9 00:02 1,86 b3b2 d2b2 c4c3 b2b6 f6e7 b6b7 e7d8 b7f7 c3c2 f7f5 c2c1q f5d5 >>>d8e7 d5d3 e7e6 >>>10 00:02 1,86 b3b2 d2b2 c4c3 b2b6 f6f7 b6b7 f7e6 b7b6 e6e7 >>>11 00:02 1,86 b3b2 d2b2 c4c3 b2b6 f6f7 b6b7 >>>12 00:04 2,06 b3b2 >>>12 00:08 3,00 b3b2 d2b2 c4c3 b2b6 f6e7 b6b7 e7e6 >>>13 00:14 3,20 b3b2 >>>13 00:19 3,74 b3b2 d2b2 c4c3 b2b6 f6e7 f3f2 c3c2 b6c6 e7d7 f2e1 d7c6 e1d2 >>>c6d5 h2h3 d5e4 h3h4 c2c1q d2c1 e4e3 c1b2 e3f4 >>> >>> >>>Regards, >>>Klaus Friedel >> >> >>See what happens if you move the white pawn on e3 to g3. I once had a bug that >>would _still_ think this sac (Rb2) was winning in that position when it >>definitely is not... > >Evaluation still works as designed. Rb2 is not selected in this case. > >Position with pawn moved to g3 > Sorry wrong position. Hier is the right one. Rb2 avoided almost instantly. [d] 8/7p/5k2/5p2/p1p2P2/Pr1p1KP1/1P1R3P/8 b - - 0 1 Snitch0.3.57 WB2 35 MB: 1 00:00 0,20 b3b2 1 00:00 1,73 b3b2 d2b2 f6g6 1 00:00 1,81 b3a3 2 00:00 1,73 b3b2 d2b2 f6g6 3 00:00 1,91 b3b2 d2b2 c4c3 3 00:00 1,93 b3a3 3 00:00 1,92 b3a3 f3e3 4 00:00 -3,34 b3a3 b2a3 f6e6 f3e3 e6d5 4 00:00 1,60 b3b2 d2b2 c4c3 b2b7 f6g6 5 00:00 -3,54 b3b2 d2b2 c4c3 b2b6 f6e7 f3e3 5 00:00 -3,34 b3a3 b2a3 f6e6 5 00:00 0,59 h7h5 f3e3 b3b8 e3d4 b8c8 5 00:00 0,87 b3b5 f3e3 b5d5 d2f2 d5d8 5 00:00 0,96 b3b6 f3e3 b6e6 e3d4 e6e4 d4c3 e4e2 6 00:00 0,87 b3b6 f3e3 b6d6 d2d1 f6e6 d1e1 d3d2 6 00:00 0,99 b3b7 f3e3 b7d7 h2h3 d7e7 e3d4 e7e2 7 00:00 1,02 b3b7 f3e3 b7d7 d2d1 f6e6 d1c1 e6d5 c1e1 7 00:00 1,19 f6e6 7 00:00 1,18 f6e6 f3e3 8 00:00 1,18 f6e6 f3e3 e6d5 h2h3 b3b6 g3g4 b6h6 g4f5 h6h3 e3f2 d5e4 9 00:00 1,18 f6e6 f3e3 e6d5 h2h3 b3b6 g3g4 10 00:00 1,21 f6e6 f3e3 e6d5 h2h3 b3b6 g3g4 b6h6 g4f5 h6h3 e3f2 d5e4 f2g2 11 00:02 1,36 f6e6 f3e3 e6d5 h2h3 b3b6 d2f2 b6e6 e3f3 h7h5 f2d2 d5d4 f3g2 d4e4 12 00:02 1,36 f6e6 f3e3 e6d5 h2h3 b3b6 d2f2 b6e6 13 00:04 1,37 f6e6 f3e3 e6d5 h2h3 b3b6 d2g2 h7h5 h3h4 b6b7 g2d2 b7e7 14 00:06 1,38 f6e6 f3e3 e6d5 h2h3 b3b6 e3f3 h7h5 f3e3 15 00:16 1,56 f6e6 f3e3 e6d5 h2h3 b3b6 d2g2 b6e6 e3f3 d5d4 g2f2 h7h5 f3g2 Regards, Klaus
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