Author: Volker Böhm
Date: 01:23:48 01/16/04
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On January 15, 2004 at 18:18:17, rasjid chan wrote: >The idea of this attack table is only to record whether a piece( type) >is attacked by other types and this is usually the most important. >It cannot even distinguish if knight/bishop is attacking; this is what >8 bits can be can give. The number of attacks must only be a total. > >Is'nt it very important to know if your queen is threathened by a pawn >or a piece is hung - has attacker and zero defender. There is a good Web-Page with informations about rebell: http://members.home.nl/matador/chess840.htm I use a bit different data-structure: 1. 1 Bit for the King 2. 1 Bit for the Queen 3. 2 Bits for Rooks 4. 2 Bits for Bishops and Knights 5. 2 Bits for Pawns total 8 Bits, but don´t cover if 2 queens are attacking the same sqare. They are counted as 1 queen. Worst if 4 bishops and knights are attacking the same sqare (verry rare isn´t it). They are counted as one rook (overflow). I´am not using exact attack-tables to calulating them. When building these "eval-attack" tables I am able to "walk-through" pieces. For Example a queen is able to walk through a rook. Only point I am missing is i don´t know witch goes first. And yes it is time consuming (haven´t got bit-boards). Greetings Mangar
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