Author: Uri Blass
Date: 02:25:07 03/29/02
Go up one level in this thread
On March 29, 2002 at 04:23:16, David Dory wrote: >On March 28, 2002 at 13:38:22, Mike Hood wrote: > >>Sometimes people in this forum talk about "typical computer moves". I don't >>think they mean particularly good or particularly bad moves, just moves that a >>top computer program plays differently than a top GM. Some people even claim to >>be able to look at a game and state whether one of the players is a program or >>not. Personally, I don't know what the criteria are. Could someone please post >>some example games by programs and point out moves that are "typical computer >>moves", explain why, and also say what a human of the same playing strength >>would have played. >> >>Thanks :) > >>[D]8/B5pp/4k3/P7/6n1/8/P6P/7K b - - 0 41 > >>Crafty as black played Nxh2!!(??). >This is a good example of a typical computer move IMO. Crafty understands that >this is a dead draw and seeks to immediately simplify by swapping the black >knight for a pawn. > >Human players look at this and think, "Oh, Gosh, Black will need the knight to >fight off those 'a' pawns from queening." > >Silicon counts a lot more, and fears nothing! > >Jouni posted this as a stupid move, but of course, it's not stupid once you >count it all out. Did I mention that computers love to count?? <grin> > >What's Oh So Human, is that even after we see that the computer move was OK (if >it was), we STILL think if was DUMB or WRONG, AN OUTRIGHT BLUNDER, or (and this >one I __REALLY LOVE__ : > **** THE COMPUTER WAS JUST L-U-C-K-Y *** > >A 100% deterministic machine being called lucky just hits my funny bone a good >one! > > >. Note Jouni's comments below. > >Dave > > > > >>Yes the game ended draw so the move is >>probably correct, but I doubt, that Crafty's evaluation really understand this. >>E.g. if white plays a6 then black has no way to a8 square... >> >>Crafty 18.14 is clever endgame player, but still I am disappointed, when >version >>17.14 solves 4 positions more in my 40 position endgame test and also 17.14 >>is on average about 30% faster in all postions! >> >>Jouni > >Mr. Hyatt's comments: > >It is just using endgame knowledge to go into a forced draw due to bishop >plus wrong rook pawns... It may use the same knowledge to play Nxh2 when it is a losing move [D]8/B5p1/4k3/P7/6n1/8/P6P/7K b - - 0 1 I am not sure if black is losing with other moves but black has at least practical chances against computers with lines like Kd7 a6 Kc8 Bd4? Nxh2 Kxh2 Kb8. It is not an example for a typical computer moves because most programs like material and are not going to play Nxh2 and I suspect that Nxh2 is not the only move to draw in the relevant position when black has 2 pawns. Uri
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