Author: Chris Whittington
Date: 04:52:55 11/21/97
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On November 21, 1997 at 07:44:29, Ernst A. Heinz wrote: >On November 20, 1997 at 23:55:56, Howard Exner wrote: > >>Here are 5 positions to test on your computer programs. The theme >>is how to play when the bishop is the opposite color of the queening >>square. >> >>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/8/8/1K6 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; >> >>The first three are wins and the last two are draws. >> >>I tested these on Rebel 8. The results are: >> >>K6-233 60Mb Hash >> >>1. Not solved by 15:00 >>2. 0:51 >>3. 0:16 >>4. 0:21 >>5. Not solved by 15:00 >> >>Problems 1 and 5 are difficult for Rebel 8. A known issue >>with Rebel 8 is it's difficulty with doubled pawns on the a >>or h files. An old Maresch test position uncovered this. >> >>Could others post some of there results for these 5 problems. >>Maybe 1 and 5 are difficult for all programs? > >DarkThought/WMCCC'97 on a 500MHz Alpha-21164a solves them all: > >1: 12 sec >2: 0 sec >3: 29 sec (prefers the also winning g5! over Be8!) >4: 0 sec >5: 79 sec If this is right, it renders my analysis to be nonsense. Is the PV and scoring information available ? Or do you have conceptual analysis of how DT solved it ? Chris Whittington > >=Ernst=
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