Author: Dann Corbit
Date: 14:25:29 12/03/03
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On December 03, 2003 at 17:04:09, Tord Romstad wrote: >On December 03, 2003 at 16:07:09, Dann Corbit wrote: > >>You can save a lot of time running WAC by just running these. The others are >>all trivial for all but the weakest engines: > >(List of positions snipped) > >I think the whole suite is useful, mainly in order to make sure you haven't >broken something when you have made a non-trivial change somewhere in the >search. > >Is there any system in the order in which you list the positions? Look at the position strings lexically. >It >all looks completely random to me. For what its worth, here they >are in increasing order of difficulty (measured by number of positions to >solution) for my engine: It is a list of often missed positions. Some of them will be very easy for many engines. >Number Plies Time Nodes >062: 1 0.00 <87 >254: 1 0.00 <93 >052: 1 0.00 <323 >091: 1 0.00 <345 >078: 1 0.01 <995 >152: 2 0.01 <1380 >228: 2 0.00 <1566 >133: 3 0.02 <3517 >176: 3 0.03 <4087 >204: 4 0.03 <6396 >111: 3 0.04 <9816 >019: 4 0.05 <11342 >238: 4 0.08 <12204 >200: 4 0.08 <14979 >256: 5 0.10 <20183 >131: 5 0.11 <22660 >086: 7 0.07 23170 >223: 4 0.13 <24524 >248: 6 0.10 25772 >272: 6 0.15 25871 >270: 6 0.11 29475 >141: 7 0.29 52911 This is impressive. WAC.141 is one of the harder ones for many engines. >214: 6 0.33 57170 >283: 5 0.28 <52966 >239: 6 0.25 73294 >155: 5 0.42 <93995 >151: 8 0.34 106803 >243: 6 0.51 107186 >287: 5 0.65 <109792 >269: 8 0.60 110559 >071: 7 0.66 116785 >265: 8 0.40 119499 >196: 7 0.77 133053 >291: 7 0.72 140632 >252: 5 0.98 <180681 >116: 7 0.96 185326 >293: 7 1.38 196680 >264: 7 1.25 207499 >247: 8 1.21 264681 >092: 8 1.53 284073 >229: 12 2.55 974063 >163: 9 5.97 1141973 >002: 12 3.86 1188036 >241: 9 7.37 1544561 >087: 12 5.23 1598581 >235: 11 17.37 4123308 >100: ? ? ? >230: ? ? ? Very few engines get the last 2. In WAC.230, there is some question as to whether it is even a solution. However, it is the only move with any winning chances. See: http://www.chess-archive.com/ccc.php?art_id=277397
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