Author: Uri Blass
Date: 23:15:11 07/15/02
Go up one level in this thread
On July 15, 2002 at 18:37:56, Alexander Kure wrote: >On July 15, 2002 at 18:34:10, Uri Blass wrote: > >>On July 15, 2002 at 18:12:48, Gian-Carlo Pascutto wrote: >> >>>On July 15, 2002 at 18:01:11, Uri Blass wrote: >>> >>>>Another question is what do you mean by a winning score. >>>> >>>>Suppose that I can see Qh5 with +0.97 score when another move has +0.56 score. >>>>Does it mean that Qh5 has a winning score? >>> >>>Win of a piece (possibly for a pawn), so something around +2. >>> >>>-- >>>GCP >> >>programs may see also only rook and 2 pawns for bishop and knight so the score >>may be only +1. >> >>Here are some computer lines: >>f4g6 f7g6 c2g6 h7g6 h5g6 g8h8 g6h5 h8g8 c1h6 e7f6 h5g6 g8h8 h6f8 f6e5 d4e5 d8f8 >> >>f4g6 f7g6 c2g6 h7g6 h5g6 g8h8 g6h5 h8g8 c1h6 e7f6 h5g6 g8h8 h6f8 f6e5 g6h5 h8g8 >>d4e5 d8f8 h5g4 g8h7 >> >> >>Uri > >The double piece sac is quite spectacular, but the winning continuation is the >very strong intermediate move Re1!! (instead of Qh5). > >Greetings >Alex I suspect that finding Re1 may be even bigger problem than finding Qh5 Movei could find only -0.74 at depth 14 and -1.24 at depth 15 after analyzing the position after Re1 for some hours. I thought something is wrong with movei so I gave Deep Fritz to analyze it for some minutes and the line at depth 15 and 16 is Brutus V099.007 - XiniX r2q1r1k/p2bb3/1pn1p1Q1/4P3/2pP4/2P5/P4PPP/1RB1R1K1 b - - 0 1 Analysis by Deep Fritz: 19...Be8 20.Qh6+ Kg8 21.Re3 Nxe5 22.Qxe6+ Kg7 23.Rh3 Nf7 24.Bh6+ Nxh6 25.Qxh6+ ± (0.78) Depth: 15/40 00:06:47 269590kN 19...Be8 20.Qh6+ Kg8 21.Re3 Nxe5 22.Qxe6+ Rf7 23.Rg3+ Kh8 24.Bf4 Nf3+ 25.Rxf3 ± (0.94) Depth: 16/43 00:23:11 861682kN (blass, tel-aviv 16.07.2002) Fritz gives as next best Rf7 with 1.75 for white at depth 15 and the third best is Rf4 with a score of 2.28 for white at depth 14. Note that 19...Be8 20.Qh6+ Kg8 21.Re3 Nxe5(Bh4 is bad because of Rh3 Nxd4 cxd4 Qxd4 Be3) is the only line that programs can see a score that is not a clear win for white(at least 2.xx) Here 22.Qxe6+ is winning. After 22.Qxe6+ Fritz has a big fail low at depth 13 and gives the following alternatives: 1)Rf7 Rg3+ Kh8 Bf4 5.59/13 for white. 2)Kh7 Rh3+ Bh4 Qh6+ 4.37/13 for white. 3)Kg7 Qxe5+ Bf6 Rg3+ 2.03/13 for white. Kg7 was the last move in the moves of Fritz so it is clear that it believes that black has no alternatives. It has another fail low at depth 14 and it is clear that Kg7 is also losing. The test position for Re1 is: [D]r2q1r1k/p2bb3/1pn1p1Q1/4P3/2pP4/2P5/P4PPP/1RB2RK1 w - - 0 19 Uri
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