Author: Uri Blass
Date: 08:43:20 11/08/02
Go up one level in this thread
On November 08, 2002 at 10:13:44, Gian-Carlo Pascutto wrote: >On November 08, 2002 at 10:09:13, Uri Blass wrote: > >>On November 08, 2002 at 09:07:39, Gian-Carlo Pascutto wrote: >> >>>On November 08, 2002 at 06:16:39, Uri Blass wrote: >>> >>>>It means that programs with the right extensions >>>>can see the tactical win for Bxg6 in a short time. >>> >>>Using material only evaluation, Deep Sjeng does not see >>>a win within the first 16 ply and wants Qxc6. >>> >>>-- >>>GCP >> >>Yace only material can learn Bxg6 by going backward >> >>Yace only material's score(under Fritz) >>(Yace is using 0.8 for pawn and 3.4 for knight so +0.60 means 5 pawns for a >>knight) > >1. The variation is 18 ply (including extensions). > >2. +0.6 is not a winning score at all (I get +1 for Qxc6 for a long time >and it doesn't win either.) > >-- >GCP My point is that only material is enough to find Bxg6(not to find that it wins the game) The +1 for Qxc6 is gone after enough time so based on only material programs can see that Bxg6 is better than Qxc6 Here is some analysis of normal yace that can find Bxg6 only after search (it needs 12 plies) [D]r3nrk1/3nq2p/1bp1p1p1/p2p2PB/3P1P2/PP2P3/1BQN4/R3K2R w KQ - 0 1 Analysis by Yace 0.99.56: 1.Qxg6+ hxg6 2.Bxg6 -+ (-6.26) Depth: 1 00:00:04 1.Bxg6 hxg6 2.Qxg6+ Ng7 = (-0.10) Depth: 1 00:00:04 1.Qxc6 +- (1.65) Depth: 1 00:00:04 1.Qxc6 Rb8 +- (1.57) Depth: 2 00:00:04 1.Qxc6 Rb8 2.Be2 +- (1.68) Depth: 3 00:00:04 1.Qxc6 Nd6 2.Be2 Rac8 +- (1.51) Depth: 4 00:00:04 1.Qxc6 Nd6 2.Be2 Rac8 3.Qa4 ± (1.35) Depth: 5 00:00:04 17kN 1.Qxc6 Nd6 2.Bd1 Rac8 3.Qa4 h5 ± (1.09) Depth: 6 00:00:04 45kN 1.Qxc6 Nd6 2.Bd1 Rac8 3.Qa4 Qf7 4.Rc1 ± (1.29) Depth: 7 00:00:04 172kN 1.Qxc6 Nd6 2.Bd1 Rac8 3.Qa4 Nf5 4.e4 Ne3 ± (1.15) Depth: 8 00:00:05 373kN 1.Qxc6 Nd6 2.Bd1 a4 3.Qc2 axb3 4.Qxb3 Ba5 5.Bc3 Rab8 ± (1.06) Depth: 9 00:00:10 1761kN 1.Qxc6 Nd6 2.Bd1 a4 3.Qc3 axb3 4.Nxb3 Ne4 5.Qc6 Rac8 6.Qb7 ± (1.08) Depth: 10 00:00:25 5791kN 1.Qxc6 Nd6 2.Be2 Rac8 3.Qa4 Nf5 4.Bb5 Nb8 5.Nf1 Rc2 6.Rb1 ± (0.76) Depth: 11 00:01:11 17489kN 1.Qxc6 Nd6 2.Be2 Rfc8 3.Qa4 Bd8 4.b4 axb4 5.Qb3 bxa3 6.Bxa3 Ba5 7.Qa2 ² (0.37) Depth: 12 00:03:49 55363kN 1.Bxg6 hxg6 2.Qxg6+ Ng7 3.Rh7 Bc7 4.0-0-0 Rf7 5.Rdh1 Rxf4 ² (0.38) Depth: 12 00:05:13 75935kN 1.Bxg6 hxg6 2.Qxg6+ Ng7 3.Rh7 Bc7 4.0-0-0 Ra6 5.Rdh1 Qf6 6.gxf6 Rxf6 7.Qxf6 Nxf6 ± (1.16) Depth: 12 00:06:40 96167kN 1.Bxg6 hxg6 2.Qxg6+ Ng7 3.Rh7 ± (1.16) Depth: 12 00:06:50 98995kN 1.Bxg6 hxg6 2.Qxg6+ Ng7 3.Rh7 Nf6 4.gxf6 Qxf6 5.Qb1 Rac8 6.a4 Nf5 7.Rh1 Kf7 8.Ba3 +- (1.51) Depth: 13 00:14:48 216406kN 1.Bxg6 hxg6 2.Qxg6+ Ng7 3.Rh7 Nf6 4.gxf6 Qxf6 5.Qxf6 Rxf6 6.Rh1 +- (1.41) Depth: 14 01:00:50 868561kN (blass, tel-aviv 08.11.2002) Uri
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