Author: Uri Blass
Date: 03:47:35 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 >> >>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. Kf4 d4 46. a5 Kb8 > >After this line 47. Kxd5 Wins in a few moves. h5 in this line is wrong This pawn needs to stay at h6 to protect g5 that protect f4. f4+ is the right move for black yace did not find the correct line and in my line that is not identical to yace's main line there is no h5. Here is yace's analysis [D]New position 8/1Pk5/P6p/3p1pp1/P7/4K2P/7P/8 b - - 0 1 Analysis by Yace 0.99.56: 6...h5 +- (3.00) Depth: 1 00:00:04 6...f4+ 7.Kd4 +- (2.96) Depth: 1 00:00:04 6...f4+ 7.Kd4 h5 +- (2.87) Depth: 2 00:00:04 6...f4+ 7.Kd3 f3 8.a5 +- (2.82) Depth: 3 00:00:04 6...f4+ 7.Kf3 Kb8 8.h4 d4 9.hxg5 +- (3.11) Depth: 4 00:00:04 6...f4+ 7.Kf3 Kb8 8.h4 d4 9.hxg5 hxg5 +- (3.11) Depth: 5 00:00:04 3kN 6...f4+ 7.Kf3 Kb8 8.h4 Kc7 9.hxg5 hxg5 +- (3.17) Depth: 6 00:00:04 17kN 6...f4+ 7.Kf3 Kb8 8.h4 Kc7 9.hxg5 hxg5 10.h4 +- (3.34) Depth: 7 00:00:04 70kN 6...h5 7.h4 gxh4 8.Kf2 d4 9.a5 f4 10.a7 Kxb7 11.a8R +- (3.31) Depth: 7 00:00:04 70kN 6...h5 7.h4 gxh4 8.h3 Kb8 9.a5 Kc7 10.Kd4 f4 +- (3.24) Depth: 7 00:00:04 70kN 6...h5 7.h4 gxh4 8.h3 Kb8 9.a5 Kc7 10.Kd3 f4 11.Kd4 +- (3.24) Depth: 8 00:00:05 172kN 6...h5 7.h4 gxh4 8.h3 Kb8 9.a5 Kc7 10.Ke2 Kb8 11.Kd3 f4 +- (3.19) Depth: 9 00:00:05 494kN 6...h5 7.h4 g4 8.a5 Kb8 9.Kf4 d4 10.Kg5 Kc7 11.Kxf5 +- (3.34) Depth: 10 00:00:06 759kN 6...h5 7.h4 g4 8.a5 Kb8 9.Kf4 d4 10.Kg5 d3 11.Kxh5 d2 12.Kg5 +- (2.94) Depth: 11 00:00:10 2990kN 6...h5 7.Ke2 f4 8.Kf3 h4 9.Kf2 d4 10.Ke2 Kb8 11.Kd3 f3 +- (2.64) Depth: 11 00:00:13 4649kN 6...h5 7.Ke2 Kb8 8.Kd3 f4 9.a5 Kc7 10.Kc2 g4 11.hxg4 hxg4 12.Kd1 d4 13.Ke2 g3 14.hxg3 fxg3 15.Kd2 d3 16.Kxd3 g2 17.a7 Kxb7 18.a8R g1Q 19.Kd2 +- (2.63) Depth: 12 00:00:19 8114kN 6...h5 7.Ke2 f4 8.Kf3 h4 9.a5 Kb8 10.Kf2 d4 11.Ke2 +- (2.58) Depth: 13 00:00:32 15525kN 6...h5 7.h4 f4+ 8.Kf3 g4+ 9.Kxf4 Kc6 +- (2.98) Depth: 14 00:00:51 25686kN 6...h5 7.h4 g4 8.a5 Kb8 9.Kd4 f4 10.Kxd5 g3 11.hxg3 fxg3 12.Kc6 g2 13.a7+ Kxa7 14.Kc7 g1Q 15.b8Q+ Ka6 16.Qb6+ Qxb6+ 17.axb6 Kb5 +- (4.05) Depth: 14 00:01:06 33933kN 6...f4+ 7.Kf3 Kb8 8.h4 Kc7 9.b8Q+ Kxb8 10.hxg5 hxg5 11.h3 d4 12.a5 d3 13.h4 gxh4 14.Kxf4 Kc7 15.a7 d2 16.a8Q d1Q 17.Ke3 +- (4.04) Depth: 14 00:01:28 45332kN 6...f4+ 7.Kf3 Kb8 8.h4 Kc7 9.a5 Kb8 10.h3 Kc7 11.h5 Kb8 12.h4 gxh4 13.Kxf4 +- (3.84) Depth: 14 00:01:42 52761kN 6...f4+ 7.Kf3 Kb8 8.h4 Kc7 9.a5 Kb8 10.h3 Kc7 11.h5 Kb8 12.h4 gxh4 13.Ke2 d4 14.Kd3 h3 15.Kxd4 +- (3.44) Depth: 15 00:02:47 84331kN (Blass, Tel-aviv 20.11.2001) Uri
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