Author: Howard Exner
Date: 08:16:36 03/02/00
Go up one level in this thread
On March 02, 2000 at 10:24:11, Howard Exner wrote: >On March 02, 2000 at 09:56:02, Robert Hyatt wrote: > >>On March 01, 2000 at 22:47:18, Howard Exner wrote: >> >>>On March 01, 2000 at 22:33:16, Robert Hyatt wrote: >>> >>>>On March 01, 2000 at 02:58:49, Dann Corbit wrote: >>>> >>>>>On March 01, 2000 at 01:37:17, Janos Keinrath wrote: >>>>> >>>>>>Hi! >>>>>> >>>>>>Yesterday I saw an intresting endgame position on ICC. >>>>>> >>>>>>[D]8/8/6k1/3p4/3P4/2P2PKp/pB4b1/8 b - - >>>>>> >>>>>>This is the final position of a blitz game played by Amateur >>>>>>with black. The game ended with rep. draw, but I feel black somehow >>>>>>can win. Could you check the position? What is the winning plan? >>>>> >>>>>Crafty likes Kf5 from the get-go, but the evaluation does not climb over one >>>>>pawn until ply 19. I'd be surprised if programs see a win at normal game-type >>>>>time controls (other than 'postal' games). >>>> >>>> >>>>Don't forget "good hardware". I get a fail high at depth=18, 35 seconds, on the >>>>quad 550 (big hash, etc). score is +1.76: >>>> >>>> 18 35.99 ++ 1. ... Kf5!! >>>> 18 1:06 1.76 1. ... Kf5 2. c4 dxc4 3. d5 Bf1 4. >>>> Bh8 Be2 5. d6 Ke6 6. f4 Bg4 7. Be5 >>>> c3 8. Bxc3 Kxd6 9. Kh2 Bf5 10. Ba1 >>> >>>In the above white can play 5. Kxh3 instead of d6. If 5. ... Bxf3 6. Kg3 Bxd5 >>>7. Kf2 = Unless black has something better? I think I've found a better sequence for black. On move 5 here is the position: [D]7B/8/8/3P1k2/2p5/5P1K/p3b3/8 b - - The move Bxf3 should be avoided and Kf4 is best. Here are some lines. 5. Kxh3 Kf4 6. Kg2 Ke3 7. d6 Bxf3+ 8. Kf1 Bg4 9. Ke1 Kd3 5. Kxh3 Kf4 6. d6 Bxf3 7. d7 Bg4+ 8. Kg2 Bxd7 9. Kf2 Bg4 >> >>This seems worse for white: >> >> >> 14-> 23.77 2.63 5. ... Bxf3 6. Kg3 Bxd5 7. Kf2 Ke4 >> 8. Ke2 Bc6 9. Bc3 Bd7 10. Bh8 Be6 11. >> Bc3 Bg4+ 12. Kd2 Bf3 >> >>(this is after 5. Kxh3) > >May be a worse eval from a computer, but take a close look at the position. >White only needs to move the king over to a1. If black manoevers its pieces >to permit c3 then Bxc3,Kxc3 >and the opposiste colored bishop ending/stalemate results. Even your above line >is >indicating that black is making no progress( ie:the many bishop moves with no >real progress). A six piece tablebase would fix this in a hurry. >> >> >> >>>> >>>>19 plies took 15 more seconds, up to +1.86. 20 was done in just over 2 minutes, >>>>score creeping up slowly iteration by iteration. >>>> >>>>This might be found in a blitz game, the search would be faster if it had an >>>>old hash table already primed with data. And thinking on the opponent's time >>>>would likely help too.
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