Author: Dieter Buerssner
Date: 10:11:30 11/20/01
Go up one level in this thread
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 >>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. Kf4 d4 46. a5 Kb8 > >After this line 47. Kxd5 Wins in a few moves. Well, the PV is not correct. Nevertheless Yace thinks the postion after Ke6 is draw, after analyzing some lines (the start of the PV until f5 seems pretty forced). 9.01 0:00 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (97.959) 126.0 9.13 0:01 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (274.961) 154.4 10.01 0:01 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (274.962) 154.2 10.13 0:04 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (693.613) 165.6 11.01 0:04 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (693.614) 165.5 11.13 0:08 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (1.374.437) 171.0 12.01 0:08 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (1.374.438) 171.0 12.13 0:20 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (3.540.132) 174.6 13.01 0:25 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (4.406.305) 173.1 13.13 0:54 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (9.525.739) 173.2 14.01 1:44 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (17.742.006) 170.3 14.13 3:02 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (31.278.394) 171.3 14.01 3:58 +0.01 2.c6 Kd6 3.cxb7 Kc7 4.bxa6 f5 5.a5 f4 6.Ke2 g5 7.Kd1 d4 8.Kc2 f3 9.Kd3 Kb8 10.h4 (41.734.803) 174.7 Regards, Dieter
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.