Author: Dann Corbit
Date: 17:55:13 02/17/04
Go up one level in this thread
On February 17, 2004 at 12:03:03, Tord Romstad wrote: >On February 17, 2004 at 08:19:28, martin fierz wrote: > >>On February 17, 2004 at 07:55:32, Tord Romstad wrote: >> >>>KR vs KP is a difficult one. Does anybody have any good suggestions about >>>how to evaluate it? At the moment I don't have any specific code for this >>>endgame at all, and Gothmog almost always evaluates it as a win for the rook. >>>In reality, it is of course very often a draw. >> >>i'll have to think about this one too. i haven't done either KR-KP or KQ-KP; >>KQ-KP should be rather easy as there are basically only two drawing positions; > >Yes. KQ-KP is much easier, and also less important, because the probability >of a draw is much smaller here. > >>KR-KP is much harder. but you should at least be able to easily identify many >>cases where KR is clearly winning; e.g. any time the KR-side king is in the >>square of the pawn KR is winning (with one exception: wKe2, bPd2, bKf1/f2, black >>to move, but qsearch should catch that). > >This is a good start, but I think it might be more valuable to work >from the other end: Which positions do we know are drawn? I guess >the probability of a draw is big if the pawn is on the fifth rank or >beyond and supported by the king, and the attacking king is far away. >But this is certainly too simple to be a sure drawing rule. > >There is also not many clear rules to be found in Keres' "Practical >Chess Endings" (my main endgame reference), which makes me fear that >it is not easy to evaluate this endgame correctly. Here's a dumb idea: Write a program to scan a Nalimov database, but throw away everything except won/lost/drawn/broken (needs 2 bits per reflected board position to store the outcome state). Then write a table. For up to the 4 man tables, it should be really tiny and fit into ram without any fuss. Seems like one single program could write a recognizer for anything [for which a Nalimov or Edwards or Thompson EGTB exists].
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