Author: Sune Fischer
Date: 04:11:31 01/13/02
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On January 13, 2002 at 06:55:14, Uri Blass wrote: >On January 13, 2002 at 06:48:22, Sune Fischer wrote: > >>On January 13, 2002 at 05:14:44, Uri Blass wrote: >> >>>>>If you find the legal moves incrementally, how can you check for >>>>>numberofmoves==1 at the first move, or do you simply forget about it then? >>>>> >>>> >>>>In the case of check, I create only check evasions, that is, _real_ legal moves. >>>>Partly because it is faster for move generation, and partly because it makes the >>>>check for this extension a lot faster. >>>> >>>>>And why the inCheck and numberOfMoves==1, can't you forget about the inCheck and >>>>>just extend +1 if there is only one legal move? >>>> >>>>No because I only do it of there's a check also. I don't generate real legal >>>>moves at all nodes, only check nodes. >>> >>>If I understand correctly numberofMoves means number of legal moves when you are >>>in check >> >>Yes >> >>>and number of pseudo legal moves when you are not in check. >> >>I'm not sure how he does that, I think he finds the moves incrementally which is >>faster than generating all the moves. It would be a problem then to know how >>many possible moves there are, which is why he needs the inCheck condition. >> >>I do it differently, I almost never generate only legal moves. I simply do not >>know when the king is in check (I don't use bitboards for movegen), so I have to >>go one ply deeper to see if the king is captured. This will lead to trouble at >>some point, so I'm thinking of changing it. >> >>>In this case you still can extend +1 only if NumberofMoves=1 because the only >>>case when Numberofmoves=1 the number of legal moves is always at most 1(it can >>>be also 0 in some stalemate situations when there is only 1 pseudo legal move) >> >>There will be more than 1 pseudo legal move if there are more than one attacked >>square around the king. > >I understand it but my point is that numberofmoves=1 when the king is not in >check means exactly one pseudolegal move and it means at most 1 legal move. But how will he now that numberofmoves=1 if he finds them incrementally? If king not inCheck -> first try the hashmove, then...... When he is about to try the hashmove, he has no idea about the number of pseudo moves. >Uri
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