Author: Chris Whittington
Date: 05:31:35 11/22/97
Go up one level in this thread
On November 21, 1997 at 21:18:38, Howard Exner wrote: >On November 21, 1997 at 20:51:29, John Stanback wrote: > >>This was a nice test for Zarkov since it made me decide to improve my >>code for pawns on rook file -- I did not have anything in there for >>multiple pawns. > >Endings like this I think occur often enough to justify the >doubled pawn codes. Could prevent an embarrising moment for a >programmer in tournament event. >> >>After the fix, Zarkov on a K6-225 does as follows: >> >>1. 8s (solution: Kd5 Kb8 Kd6 b6 a6 Kc8 Kc6 Kb8 Bg3+ Ka8 Bd6 b5 Be5 >>+6pawns) > >The source for this problem (Chess Life - Tal Shaked issue) >claims a draw for Kd5 with b7-b5! (thus the point of a4). >It doesn't however give any further analysis. > >>2. 0s >>3. 61s >>4. 8s >>5. not solved >> >> >>On November 21, 1997 at 18:30:03, Howard Exner wrote: >> >>>k7/pp6/8/P7/3K4/P7/P4B2/8 w - - id"a3-a4 - Wrong Bishop" bm a3 a4; >>>5k2/8/7P/8/8/8/K6P/1B6 w - - id"B-h7 - Wrong Bishop" bm b1h7; >>>8/7p/6p1/3k4/B5PP/8/K7/8 w - - id"a4e8 - Wrong Bishop" bm a4e8; >>>8/6p1/8/3kP2P/6K1/8/8/2b5 w - - id"h5-h6 - Wrong Bishop" bm h5h6; >>>8/8/pp6/3b2K1/1P6/PN2k3/8/8 w - - id"Na5 draw - Wrong Bishop" bm b3a5; >>> >>>Here is a summarry of results for this test. Note that position #3 >>>has been corrected to allow for only one solution (thanks to Ernst >>>Heinz). >>> >>> Rebel8 Crafty CSTal Genius3 DarkThought >>> K6-200 P5-233 P6-200 486-33 Alpha 500 >>> >>>1 X X 0:33 ? 0:12 >>>2 0:51 0:00 0:00 ? 0:00 >>>3 0:17 ? ? ? ? >>>4 0:21 0:58 0:30 ? 0:00 >>>5 X X X 1:28 1:19 >>> I don't accept the 'solutions' for #5, here's why: This series of test positions is not about being clever and then 'solving' each position. Its purpose is to demonstrate the issue of bad bishop and rook file pawns together with some difficult special case issues - against the idea of just searching the position out into the disatance. I posit that #5 is semi-unsolvable without some very special case code that is (a) very difficult to code, and (b) very unlikely to have been coded. I posit that the 'solutions' to #5 are simply the result of choosing the 'right' move as the least bad loss; and that this is a matter of luck for the solvers. Ernst has already said that Dark Thought scores #5 as -3.5 or something. To be listing results like the table above strikes me as crass materialism, or quantity over quality - since a solution (in this test, given the nature of this test) that is created for the wrong reason, is no solution at all. Chris Whittington >>>The original pos 3 was solved by Crafty,CTal and >>>DarkThought and they will no doubt solved the slightly >>>modified #3 as well. >>> >>>Also, Ernst may have found an alternate solution to #5. >>>Asked for some analysis of Kd5 in another post.
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