Author: José Carlos
Date: 11:51:04 12/02/04
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>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. 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. It is also important to check if a rook in a line can eventually move into enemy's position. For example, in the following position: [D]r2qkbnr/p1pppppp/1b6/8/8/8/P1PPPPPP/1RBQKBNR w Kkq - 0 1 The rook is not very useful in b1. Same for this position: [D]r2qkbnr/p1bppppp/2b5/2p5/8/8/P1PPPPPP/1RBQKBNR w Kkq - 0 1 José C.
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