Author: Uri Blass
Date: 03:08:18 11/20/01
Go up one level in this thread
On November 20, 2001 at 05:49:02, Uri Blass wrote: >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 <snipped> >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 It leads to the following test position How much time does your program need to avoid axb5 and find a king move that gives at least practical chances for a draw(I did not analyze it to be sure that it is a draw)? New position [D]8/1p3p2/p4kpp/1PPp4/P7/7P/5K1P/8 b - - 0 1 Analysis by Yace 0.99.56: 4...axb5 5.axb5 -+ (-1.74) Depth: 1 00:00:04 4...h5 -+ (-1.84) Depth: 1 00:00:04 4...g5 -+ (-1.88) Depth: 1 00:00:04 4...Ke6 -+ (-1.90) Depth: 1 00:00:04 4...Ke5 -+ (-2.04) Depth: 1 00:00:04 4...Ke5 5.Ke3 -+ (-1.79) Depth: 2 00:00:04 4...Ke5 5.c6 g5 6.bxa6 µ (-1.32) Depth: 3 00:00:04 4...Ke5 5.c6 bxc6 µ (-0.84) Depth: 3 00:00:04 4...axb5 5.Ke3 Ke5 -+ (-1.76) Depth: 3 00:00:04 4...axb5 5.axb5 Ke5 6.Ke3 -+ (-1.76) Depth: 3 00:00:04 4...axb5 5.axb5 Ke5 6.c6 bxc6 -+ (-1.84) Depth: 4 00:00:04 4...axb5 5.axb5 Ke6 6.Ke3 f5 7.c6 bxc6 -+ (-1.91) Depth: 5 00:00:04 5kN 4...axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.Kd4 -+ (-1.64) Depth: 6 00:00:04 33kN 4...axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.Kd4 Ke6 -+ (-1.83) Depth: 7 00:00:04 86kN 4...axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.Kd4 Ke6 9.c6 -+ (-1.70) Depth: 8 00:00:04 240kN 4...axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 -+ (-1.83) Depth: 9 00:00:05 562kN 4...axb5 5.axb5 Ke6 6.Ke3 f5 7.b6 Kd7 8.h4 h5 9.Kd4 Ke6 10.c6 -+ (-1.70) Depth: 10 00:00:07 1432kN 4...axb5 5.axb5 Ke6 6.Ke3 f5 7.Kd4 f4 8.h4 Kd7 9.h3 f3 10.Ke3 g5 11.hxg5 hxg5 12.Kxf3 -+ (-1.88) Depth: 11 00:00:10 3215kN 4...axb5 5.c6 bxc6 6.a5 b4 7.Ke3 b3 8.Kd2 d4 9.a6 d3 10.Kxd3 Ke5 11.a7 b2 12.Kc2 Kd6 -+ (-1.51) Depth: 12 00:00:17 7322kN 4...axb5 5.c6 bxc6 6.a5 b4 7.Ke3 b3 8.Kd2 d4 9.a6 b2 10.Kc2 Ke5 11.Kxb2 d3 12.a7 d2 13.Kc2 Kd6 µ (-1.17) Depth: 13 00:00:24 11356kN 4...axb5 5.c6 bxc6 6.a5 b4 7.Ke3 b3 8.Kd2 b2 9.Kc2 Ke6 10.a6 Ke7 11.a7 b1R 12.a8Q h5 µ (-0.77) Depth: 14 00:00:36 18217kN 4...axb5 5.c6 bxc6 6.a5 b4 7.Ke3 b3 8.Kd2 b2 9.Kc2 b1Q+ 10.Kxb1 g5 11.a6 g4 12.hxg4 Kg5 13.a7 Kxg4 = (0.23) Depth: 14 00:00:37 18713kN 4...axb5 5.c6 bxc6 6.a5 b4 7.Ke3 b3 8.Kd2 b2 9.Kc2 d4 10.a6 d3+ 11.Kxb2 d2 12.Kc2 d1Q+ 13.Kxd1 Ke5 ² (0.43) Depth: 14 00:00:41 21052kN 4...axb5 5.c6 bxc6 6.a5 b4 7.Ke3 b3 8.Kd2 b2 9.Kc2 Ke6 10.a6 g5 11.a7 g4 12.a8Q Kf5 ± (0.83) Depth: 15 00:01:06 34581kN 4...axb5 5.c6 bxc6 6.a5 b4 7.Ke3 b3 8.Kd2 g5 9.a6 g4 10.hxg4 h5 11.gxh5 c5 12.a7 b2 13.Kc2 b1R 14.a8Q Rd1 +- (1.83) Depth: 15 00:01:07 35141kN 4...axb5 5.c6 bxc6 6.a5 b4 7.Ke3 +- (1.83) Depth: 15 00:01:11 37456kN 4...axb5 5.c6 bxc6 6.a5 b4 7.Ke3 h5 8.Kd2 g5 9.a6 c5 10.a7 Kf5 +- (2.23) Depth: 16 00:01:56 62191kN 4...axb5 5.c6 bxc6 6.a5 b4 7.Ke3 h5 8.Kd2 b3 9.a6 b2 10.Kc2 h4 11.a7 Kf5 12.a8Q Ke4 +- (3.23) Depth: 16 00:01:59 63931kN 4...axb5 5.c6 bxc6 6.a5 b4 7.Ke3 h5 8.Kd2 b3 9.a6 c5 10.a7 c4 11.a8Q Ke5 12.Qe8+ Kf6 13.Qd7 b2 14.Qd6+ +- (3.72) Depth: 16 00:02:19 75285kN 4...Ke6 5.c6 Kd6 6.cxb7 Kc7 7.b8Q+ Kxb8 8.b6 a5 9.h4 Kb7 10.Kf3 +- (3.71) Depth: 16 00:03:03 99101kN 4...Ke6 5.c6 Kd6 6.cxb7 Kc7 7.bxa6 f5 8.Ke2 g5 9.Ke3 h5 10.h4 g4 11.Kf4 d4 12.a5 Kb8 13.Kg5 +- (3.28) Depth: 16 00:04:19 140272kN (Blass, Tel-aviv 20.11.2001) Uri
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