Author: Eelco de Groot
Date: 18:39:56 05/31/05
Go up one level in this thread
On May 31, 2005 at 18:24:33, Richard Pijl wrote: >I've been using the arasan testsuites quite a lot as they contain a nice mix of >different type of positions. Today I was looking at a position that was always >solved by the Baron in 30 seconds, but not anymore by the latest test version. >I'm talking about the position with id Arasan.81: >[D]1B4k1/5p2/K5p1/7p/P4P2/5P2/8/6n1 b - - >Bestmove is said to be f5, to block the bishop from stopping the black pawn on >h5 from queening. This seems to be confirmed by many engines with about a draw >score. But now, after an initial drawish score, the Baron shows a show of minus >1 pawn in a second, quickly decreasing to - 3 pawns for f5, later switching to >Nxf3 with a similar score. Somehow f5 doesn't seem to be that good. >Just to be sure I also checked with Ruffian, and also Ruffian shows a declining >score for 1..f5, although it needs a little more time to see that. >One line seems to be 1..f5 2.Ba7 Nxf3 (or 2..Ne2 3.Bf2) 3.Bf2 h4 4.Bxh4 and the >a-pawn queens as the king and knight are too far away, e.g 4..Nxh4 5.a5 (5..Nf3 >6.Kb6!) Ng2 6.Kb5 Nxf4 7.a6 Nd5 8.a7 Nc7 9.Kc6 Na8 10.Kb7 >Is there anyone that has a drawing(winning?) line for black after 1..f5? >bye, >Richard. I don't know if it is correct but two programs also indicate that after f7-f5, Ba7 is a good move for White. Seems very good analysis from The Baron! Toga II, based on Fruit from Fabien Letouzey 00:00:20.0 2,16 1 2 Nxf3 00:00:20.1 1,80 2 49 Nxf3 Kb5 00:00:20.1 2,12 2 108 h4 f5 Nxf3 fxg6 fxg6 00:00:20.1 2,12 3 173 h4 f5 Nxf3 fxg6 fxg6 00:00:20.1 2,19 3 319 Nxf3 f5 g5 00:00:20.1 1,72 4 628 Nxf3 Kb5 h4 a5 00:00:20.1 2,06 4 1167 h4 Ba7 Nxf3 Kb5 00:00:20.1 2,17 5 2132 h4 f5 g5 Be5 Nxf3 00:00:20.1 1,85 6 3186 h4 f5 g5 a5 Nxf3 Kb6 00:00:20.1 2,42 7 8218 h4 Kb5 h3 f5 g5 a5 Nxf3 00:00:20.1 2,01 8 14564 h4 f5 g5 a5 Nxf3 Kb6 Nd4 f6 00:00:20.3 2,18 9 25976 h4 f5 g5 a5 Nxf3 Kb6 Nd4 a6 Nxf5 00:00:20.5 2,21 10 38347 h4 f5 g5 a5 Nxf3 Kb5 h3 a6 Nd4+ Kc5 Nxf5 00:00:25.7 1,45 11 105383 h4 f5 Nxf3 fxg6 fxg6 Kb5 h3 a5 Kf7 a6 Nd4+ Kc5 Nf3 00:00:28.5 1,49 12 213623 h4 f5 Nxf3 fxg6 fxg6 Kb5 h3 a5 Nd4+ Kc5 Nb3+ Kb5 Kf7 a6 Ke6 00:00:29.6 1,35 13 354615 h4 f5 Nxf3 fxg6 fxg6 Kb5 h3 a5 Nd4+ Kc5 Nb3+ Kb4 Nxa5 Kxa5 g5 Be5 g4 00:00:31.8 1,24 14 727396 h4 f5 Nxf3 fxg6 fxg6 Kb5 Kf7 a5 Nd4+ Kc5 Nb3+ Kb4 Nxa5 Kxa5 g5 Kb5 Ke6 Kc4 00:00:35.6 0,88 15 1387600 h4 f5 Nxf3 fxg6 f6 Bf4 Ne5 Kb5 Nxg6 Bh2 h3 a5 Ne5 a6 Kf7 00:00:50.2 0,58 16 3954714 h4 f5 Nxf3 fxg6 fxg6 Kb5 Kf7 a5 Nd4+ Kb6 Nf5 a6 Ne7 Kc5 Nc8 Kd4 g5 Ke4 00:00:52.7 0,71 16 4420506 Nxf3 f5 Nd4 fxg6 fxg6 Kb6 Nb3 Bf4 h4 a5 Nxa5 Kxa5 h3 Kb5 g5 Be5 Kf7 Kc4 00:02:56.6 -1,09 17 26173096 Nxf3 a5 h4 Kb6 f5 a6 h3 a7 h2 a8Q h1Q Be5+ Kf7 Qb7+ Ke6 Qc6+ Ke7 Qd6+ Kf7 Qd7+ Kf8 Qd8+ Kf7 Qf6+ Ke8 Qxg6+ Ke7 Qf6+ Ke8 Qxf5 00:03:04.3 0,28 17 27561703 h4 f5 Nxf3 fxg6 f6 Bf4 Ne5 Kb5 Nxg6 Bh2 h3 a5 Ne7 a6 Nc8 Bf4 Kf7 00:03:26.7 0,60 17 31568481 f5 Kb5 h4 a5 h3 a6 h2 a7 h1Q a8Q Qxf3 Qa2+ Kh7 Qf7+ Kh6 Be5 Qd3+ Kc5 Qe3+ Kb5 Qe2+ Kc5 Qc2+ Qc4 Qd2 00:03:45.9 0,37 18 34915429 f5 Kb5 h4 a5 h3 a6 h2 a7 h1Q a8Q Qxf3 Qa2+ Kh7 Qa7+ Kh6 Qxg1 Qb3+ Kc5 Qxb8 Qg5+ Kh7 Qe7+ Kg8 Qe6+ Kg7 Qe7+ Kh8 Qe5+ Qxe5+ fxe5 00:04:39.7 0,00 19 44421972 f5 Kb5 h4 a5 h3 a6 h2 a7 h1Q a8Q Qxf3 Qa2+ Kh7 Qa7+ Kh6 Qxg1 Qb3+ Kc5 Qxb8 Qg5+ Kh7 Qe7+ Kg8 Qe6+ Kg7 Qe7+ Kh8 Qf6+ Kh7 Qe7+ 00:06:43.7 0,00 20 66311762 f5 Kb5 h4 a5 h3 a6 h2 a7 h1Q a8Q Qxf3 Qa2+ Kh7 Qa7+ Kh6 Qxg1 Qb3+ Kc5 Qxb8 Qg5+ Kh7 Qe7+ Kg8 Qe6+ Kg7 Qe7+ Kh8 Qf6+ Kh7 Qe7+ 00:10:19.1 0,00 21 103383206 f5 Kb5 h4 a5 h3 a6 h2 a7 h1Q a8Q Qxf3 Qa2+ Kh7 Qa7+ Kh6 Qxg1 Qb3+ Kc5 Qxb8 Qg5+ Kh7 Qe7+ Kg8 Qe6+ Kg7 Qe7+ Kh8 Qf6+ Kh7 Qe7+ 00:17:31.4 0,00 22 177929386 f5 Kb5 h4 a5 h3 a6 h2 a7 h1Q a8Q Qxf3 Qa2+ Kh7 Qa7+ Kh6 Qxg1 Qb3+ Kc5 Qxb8 Qg5+ Kh7 Qe7+ Kg8 Qe6+ Kg7 Qe7+ Kh8 Qf6+ Kh7 Qe7+ 00:44:06.3 -2,38 23 451890487 f5 Ba7 Nxf3 Bf2 h4 Bxh4 Kf7 Kb7 Nd4 a5 Nb3 a6 Nc5+ Kb6 Nxa6 Kxa6 Ke6 Kb5 Kd5 Be7 Ke4 Bd6 Ke3 Be5 Ke4 Current move: Kh7 (7/11) depth=23 Celeron 500 MHz, 32 Mb HT, default personality as I could not get that new feature by Jim Ablett working under UCI I in my Lokasoft Chess Partner. It is an interesting program though! I just installed it. And a nice thing to have personality options now for Toga. Maybe I can get it to work in Winboard. Pro Deo 1.1 Vulcan Q1d8d on a much faster Athlon 3200+, 200 Mb HT 00:00:00.1 2,33 1 4 Kg7 00:00:00.1 2,66 1 6 Ne2 00:00:00.1 4,06 1 14 h4 00:00:00.1 2,40 2 77 h4 a5 00:00:00.2 3,64 3 314 h4 f5 Nxf3 00:00:00.2 2,28 4 766 h4 a5 h3 Kb7 00:00:00.2 2,02 5 1486 h4 a5 Kf8 f5 Nxf3 Bd6+ 00:00:00.2 2,38 6 3973 h4 a5 h3 f5 Nxf3 Kb7 gxf5 00:00:00.2 1,64 7 8598 h4 a5 h3 Kb7 h2 a6 Ne2 a7 00:00:00.2 1,75 8 19672 h4 a5 h3 Kb7 h2 a6 h1Q 00:00:00.2 1,75 9 32906 h4 a5 h3 Kb7 h2 a6 00:00:00.3 0,65 10 187684 h4 a5 f5 Kb7 h3 a6 h2 a7 00:00:00.5 0,53 11 508768 h4 a5 Nxf3 Kb6 h3 f5 Kg7 a6 g5 a7 g4 Bf4 00:00:00.6 0,53 11 641982 Nxf3 00:00:00.6 0,94 11 723041 Nxf3 a5 f6 Kb5 g5 fxg5 fxg5 a6 h4 a7 g4 Bh2 Nxh2 00:00:00.9 0,94 12 1135031 Nxf3 a5 h4 Kb6 f6 a6 g5 fxg5 fxg5 00:00:01.7 0,83 13 2219206 Nxf3 a5 h4 Kb6 h3 f5 g5 a6 Kg7 a7 g4 Bf4 Kf6 Bd6 Kg5 00:00:09.4 -2,93 14 13715068 Nxf3 a5 h4 Kb6 h3 f5 gxf5 a6 Kh7 a7 f6 00:00:13.2 -0,14 14 19561677 h4 a5 h3 f5 Kg7 Kb6 g5 a6 Nxf3 Ka5 00:00:22.8 -2,22 15 34070353 h4 Kb6 f5 a5 h3 a6 h2 a7 00:00:50.5 -1,58 16 76368856 h4 Kb6 f5 a5 h3 a6 h2 a7 00:01:09.2 -1,58 17 104652768 h4 Kb6 f5 a5 h3 a6 h2 a7 00:03:16.4 -0,38 18 303875503 h4 Kb6 f5 a5 h3 a6 h2 a7 00:07:41.8 -2,22 19 722400390 h4 f5 Nxf3 a5 Nd4 Kb6 Nxf5 a6 00:12:32.2 -0,38 19 1155324925 f5 a5 h4 Kb6 h3 a6 h2 a7 00:16:24.1 -0,52 20 1506153410 f5 Ba7 Nxf3 Bf2 Nd2 Kb5 Ne4 00:29:44.3 -0,69 21 2737325164 f5 Ba7 Nxf3 Bf2
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