Author: Uri Blass
Date: 03:56:45 11/20/01
Go up one level in this thread
On November 20, 2001 at 06:34:52, Chessfun wrote: >On November 20, 2001 at 06:26:34, Chessfun wrote: > >>On November 20, 2001 at 06:08:18, Uri Blass wrote: >> >>>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 >> >> >>I think you'll find the original position after Rd5 is lost for black. >>As is the above after Ke6. >> >>From the original position. >>36. Rxd5 cxd 37. a4 Kf6 38. b5 >>to yours >>Ke6 39.c6 Kd6 40.cxb7 Kc7 41.bxa6 f5 42. Ke2 g5 43. Ke3 h5 44. h4 g4 >>45. > >Sorry. >The line should read. >45. a5 Kb8 46. Kd4 f4 47. Kxd5 > > >Sarah. I understood that there was a mistake in the line some moves after 43...h5 but I did not care because h5 is a losing move and it was clear to me that it was copied from yace's line. Uri
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.