Author: Uri Blass
Date: 12:56:30 12/02/04
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On December 02, 2004 at 14:51:04, José Carlos wrote: > >>What is the definition of closed files? >>By movei's definition closed files are files that are not open and >>open files are files when there is no friendly pawn that prevent the rook to >>go forward(there may be pieces or pawns of the opponent that prevent it to go >>forward but if you remove all pieces except friendly pawns the rook can go to >>the 8th rank). >> >>By movei's definition the b file is an open file because there are no friendly >>pawns in that file. >> >>Movei has a bonus of 0.1 pawns for rook on open file and panelty of 0.1 for >>closed file and I am not sure if that bonus and panelty is productive. >> >>It was productive in the positions that I tested at the time that I implemented >>it but I did not play enough games and it is possible that the positions were >>misleading and in different positions I could get different results. >> >>Uri > > If there is an enemy pawn in an open line, and it's defended by another pawn, >that's not likely to be a useful place for a rook. I agree and I also thought about it. I may tell it not to give bonus for open file only when there is no protected enemy pawn in the same file. > The definition to open line is a line without any pawn. > A closed line is a line with a friendly pawn. > A semi-open line is a line with no friendly pawn but opponent's pawn. > Those three should have IMO different bonus/malus. I thought that sometimes is it better to attack opponent weak pawn and not to attack nothing so I decided to give semi close file and open file the same bonus. > It is also important to check if a rook in a line can eventually move into >enemy's position. Movei today does not check in it's mobility evaluation if a move is to square that is controlled by the enemy bishops and I will probably improve other things before trying it. checking if an enemy pawn in the same file is protected by a pawn is more easy to do and I may do it. Uri
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