Author: Uri Blass
Date: 02:49:02 11/20/01
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On November 20, 2001 at 05:02:24, Jouni Uski wrote: >It's not so easy position: even the mighty Yace wants to play -Rd5 after >20 minutes and 300 000 000 nodes. It's not so easy to find this line: > >1.- Rd5 2. Rxd5 cxd5 3. a4 Kf6 4. b5 axb5 5. c6 bxc6 6. a5 Ke6... > >BTW is it sure, that Rd5 is losing? Can black improve? > >Jouni I am not sure if Rd5 is losing at least in comp-comp game Here is a drawn position that can happen in comp-comp game many plies after the root 3.a4 Kf6 4.b5 Ke6 5.c6 Kd6 6.cxb7 Kc7 7.bxa6 g5 8.h4 f5 9.Ke3 f4+ 10.Kf3 Kb8 11.hxg5 hxg5 12.h3 New position [D]1k6/1P6/P7/3p2p1/P4p2/5K1P/8/8 b - - 0 1 Analysis by Yace 0.99.56: 12...Kc7 +- (3.23) Depth: 1 00:00:00 12...d4 +- (3.17) Depth: 1 00:00:00 12...d4 13.Ke4 +- (3.30) Depth: 2 00:00:00 12...Kc7 13.h4 gxh4 14.Kxf4 d4 15.a5 h3 16.b8Q+ Kxb8 17.Kg3 d3 18.Kh2 Kc7 19.Kg3 d2 20.a7 +- (3.01) Depth: 2 00:00:00 12...Kc7 13.h4 +- (3.01) Depth: 2 00:00:00 12...Kc7 13.h4 Kb8 +- (3.44) Depth: 3 00:00:00 12...Kc7 13.h4 gxh4 +- (3.63) Depth: 3 00:00:00 12...Kc7 13.h4 gxh4 14.Kxf4 +- (3.63) Depth: 4 00:00:00 12...Kc7 13.h4 gxh4 14.Kxf4 h3 15.b8Q+ Kxb8 16.Kg3 h2 17.Kxh2 d4 18.Kh1 d3 19.Kg2 Ka8 20.Kf2 d2 21.Ke2 d1Q+ 22.Kxd1 Ka7 +- (3.17) Depth: 5 00:00:00 12...Kc7 13.h4 gxh4 14.Kxf4 h3 15.Kf3 +- (3.01) Depth: 5 00:00:00 12...Kc7 13.Kg4 d4 14.Kxg5 f3 15.Kf4 +- (3.43) Depth: 6 00:00:00 3kN 12...Ka7 13.Kf2 d4 14.Ke1 d3 15.Kd1 f3 16.Ke1 Kb8 17.a5 Kc7 18.a7 Kxb7 19.Kd2 f2 20.Ke3 f1Q 21.a8R +- (3.42) Depth: 6 00:00:00 3kN 12...Ka7 13.Kg4 f3 14.Kxf3 d4 15.a5 d3 +- (3.44) Depth: 6 00:00:00 3kN 12...Kc7 13.Kg4 d4 14.Kxg5 f3 15.Kf4 +- (3.43) Depth: 6 00:00:00 3kN 12...Kc7 13.h4 gxh4 14.Kg2 d4 15.a7 f3+ 16.Kh2 Kxb7 17.Kg1 d3 18.Kf2 d2 19.a8N +- (3.02) Depth: 7 00:00:00 7kN 12...Kc7 13.Kg4 d4 14.a5 Kb8 15.Kf3 d3 +- (2.94) Depth: 7 00:00:00 7kN 12...Kc7 13.Kg4 d4 14.a5 Kb8 15.Kf3 d3 16.Kf2 +- (2.63) Depth: 8 00:00:00 44kN 12...Kc7 13.Kg4 d4 14.a5 Kb8 15.Kf3 d3 16.Kf2 Kc7 +- (2.67) Depth: 9 00:00:00 61kN 12...Kc7 13.Kg4 d4 14.a5 Kb8 15.Kf3 d3 16.Kf2 Ka7 17.Kf1 +- (2.65) Depth: 10 00:00:00 113kN 12...Kc7 13.Kg4 d4 14.a5 Kb8 15.Kf3 d3 16.Kf2 Kc7 17.Ke1 f3 +- (2.63) Depth: 11 00:00:00 188kN 12...Kc7 13.Kg4 d4 14.a5 Kb8 15.Kf3 d3 16.Kf2 Kc7 17.Ke1 f3 18.Kd2 +- (2.63) Depth: 12 00:00:00 320kN 12...Kc7 13.a5 Kb8 14.Ke2 d4 15.Ke1 Ka7 16.Kf1 d3 17.b8N Kxb8 18.a7+ Kxa7 19.Kg2 d2 20.h4 +- (2.63) Depth: 13 00:00:01 646kN 12...Kc7 13.Ke2 d4 14.Kf2 d3 15.Kf3 Kb8 16.a5 Kc7 17.Ke4 d2 18.Kf5 +- (2.63) Depth: 14 00:00:02 1089kN 12...Kc7 13.Ke2 d4 14.Kf2 d3 15.Kf3 Kb8 16.a5 Kc7 17.Kg4 d2 18.Kxg5 d1Q 19.b8R +- (2.63) Depth: 15 00:00:05 2315kN 12...Kc7 13.Ke2 d4 14.a5 Kb8 15.Ke1 g4 16.hxg4 f3 17.a7+ Kxa7 18.b8Q+ Kxb8 19.a6 d3 20.a7+ Kxa7 21.g5 Kb6 22.g6 d2+ 23.Kxd2 f2 24.Ke2 Kc5 25.g7 f1R 26.g8Q Rd1 +- (2.23) Depth: 16 00:00:16 6364kN 12...Kc7 13.Ke2 d4 14.a5 Kb8 15.Ke1 Ka7 16.h4 gxh4 17.Ke2 f3+ 18.Kxf3 d3 19.Kg2 h3+ 20.Kh1 d2 21.b8R d1Q+ 22.Kh2 +- (1.83) Depth: 17 00:00:36 11683kN 12...Kc7 13.Ke2 d4 14.a5 Kb8 15.Ke1 Ka7 16.Ke2 Kb8 = (0.00) Depth: 17 00:00:56 19989kN (Blass, Tel-aviv 20.11.2001) Uri
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