Author: Tony Werten
Date: 04:31:35 01/07/03
Go up one level in this thread
On January 07, 2003 at 07:17:27, Ed Schröder wrote: >On January 07, 2003 at 06:48:50, Tony Werten wrote: > >>On January 07, 2003 at 05:47:37, Ed Schröder wrote: >> >>>On January 07, 2003 at 05:05:31, Tony Werten wrote: >>> >>>>Hi Ed, >>>> >>>>your board tables seem to ignore xray attacks. > > >>>xray attacks are done, it's only not mentioned as I thought it would be >>>self-understood. > >>I don't see how they are combined with the boardtables to find hanging pieces. >> >>Adding them as normal attacks will make you go wrong as often as not counting >>them at all, is my guess. > >Let's go through a couple of xray examples: I understand (I think). Ignore low pieces through high pieces, but add high through low as a normal attack. Seems a cheap way. One question though. Will it go wrong in this position (g8) ? [d]r2qkbqr/pbppp1pp/1pn2p2/3Q4/2B5/2P1P3/PP1P1PPP/RNB1K1NR b KQkq - Tony > >[d]rn1qkbnr/pbppp1pp/1p3p2/8/2B5/1QP1P3/PP1P1PPP/RNB1K1NR b KQkq - > >The knight on G8 is hanging, 2 attackers, one defender, the lowest attacking >piece is a bishop. You can extract this from the bit settings. > > > > > > > >[d]r2qkbnr/pbppp1pp/1pn2p2/3Q4/2B5/2P1P3/PP1P1PPP/RNB1K1NR b KQkq - > >The knight on G8 is not hanging because the lowest attacking piece is a Queen. > > > > >[d]rn2kbnr/pppqpppp/3pb3/8/8/P1N4N/1PPPPPPP/R1BQKB1R w KQkq - > >The white knight on H3 is well covered, 2 attackers, 2 defenders, the lowest >attacking piece is a bishop, but its defender is lower, a pawn. The white bishop >on F1 looks through G2 to H3. > >Hope this helps, > >Ed > > > >>Tony >> >>> >>> >>>>Is that because it doesn't matter too much, or because it's mainly used for move >>>>ordering ( so it's only less effective but not wrong ) ? >>> >>>I use xray also for evaluation, for instance for mobilty, king safety, so xray >>>must be done and in an accurate way, I will write a little about it in the >>>mobility section. >>> >>>Ed >>> >>>>Or do you handle xray attack as a normal attack ? >>> >>> >>>>Cheers, >>>> >>>>Tony
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