Author: Uri Blass
Date: 05:55:58 12/03/04
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On December 03, 2004 at 07:26:24, Vasik Rajlich wrote: >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. >> 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. > >Just one thing to add here: these positions are pretty much the worst-case >scenarios for a totally open file, and they're nowhere near as bad as some of >the bad half-open-file cases (as for example from Movei-Junior). If you're going >to give automatic bonuses, it seems that the bonus for a completely open file >should be quite a bit higher than for a half-open file. > >Vas Movei gives bonus for mobility that is not for open files so practically open files get bigger bonus because the rook control more squares. Uri
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