Author: Bruce Moreland
Date: 10:44:42 02/22/99
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On February 22, 1999 at 08:14:05, Dan Homan wrote: >On February 22, 1999 at 04:09:49, Will Singleton wrote: > >>New Feature >> >>I thought I'd post a position each week, taken from member submissions >>from the current week's play. Recently on the CCC board we've had a few >>positions posted, and these have helped me track down some problems with >>my code. Probably just chance, but I think these things are helpful >>for programmers in that they can see how their results differ from others, >>and figure out why. >> >>So members, please send me interesting games that your programs play (or >>just the positions), and perhaps we can all benefit from the analyses. >> >>To start the ball rolling, here's a position from the game Amateur-LambChop, >>played on ICC yesterday. For some reason, Amateur declined the easy move, >>which would have won quickly, and played a tricky move that led to a loss. >>On subsequent analysis, it took Amateur 9 ply to see the right move. During >>the actual game (blitz), it only searched about 7 ply. I'm thinking this >>might be some bug or other weirdness. Does your program have any trouble >>finding the right move quickly? >> >>7k/2pn1Q2/2r4p/p1qpp3/Pp1b3N/1P1P2PP/2P1R2B/7K w - - > >Nice problem. I'll have to look at it in more detail later, but here >are EXchess' results > >EXchess likes Qxd7 with a score of +3.3 until ply 6 where it switches >to Nf5. The score Nf5 climbs to +4.1 in ply 7 and 8. In ply 9, Nf5 >fails low with a score of 0.6 and EXchess switches back to Qxd7 with a >score of 3.8. Qxd7 fails high at ply 10.... I haven't run it deeper >yet. Looks very interesting. This is another interesting FEN. 7k/2pn1Q2/2r4p/p1qppN2/Pp1b4/1P1P2PP/2P1R2B/7K b - - 2 51 This is the position after 51. Nf5 in the game. The problem here is to figure out how long until your program thinks that white's advantage is much reduced. bruce
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