Author: Robert Hyatt
Date: 19:51:55 05/01/04
Go up one level in this thread
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...
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