Author: Dann Corbit
Date: 18:57:44 12/06/02
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On December 06, 2002 at 16:53:11, Sergei S. Markoff wrote: > Hello All! > > It's very important thing to discuss. > The strength of engine playing in rook endings is very important. I think that >the fine evaluation of rook endings must be based on special knowledge. For >example Tarrasch theorem and also special evaluation for pawn structure. > There are many things in rook endings which is not common for other stages of >the game. For example: rook on open files evaluation. I think that the score of >the rook on the open file in rook ending must be based on number of open files >and, may be, on other pawn structure parametres. > Also the important thing may be is the king placement with relation to >enemy/own pawns. For example the pawn which is out of enemy king quadrant is a >big advantage in most cases (Because the rook is stronger than king in most >cases and to stop this pawn we must use the rook. But this is way to >immobilizing the strong piece). > In many cases one pawn in rook endings isn't a big advantage, especially for >one-sided endings. But it's not easy to found: when the pawn is good and when >it's bad (for example Junior7 in many cases decides that the one pawn in rook >endings is a near the draw but i think that it's a case of voluntarism :) > Have your any non-secret ideas? :) Sure. Everybody does that stuff. Some very good open source programs that show those ideas are: Crafty Pepito Amy ExChess Arasan Lots more besides these, of course. Some typical tricks: Have a table of precomputed distances to find out if the king can catch the pawn or not. If you have a rotated bitboard by 90 degrees, you can do & with 0xff shifted from 0 to 7 to find open files by anding against the pawn bitmasks. Big bonus (of course) for pigs in the 7th. If you poke around in the source code somewhat, you will find all kinds of clever things.
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