Author: Vasik Rajlich
Date: 04:26:24 12/03/04
Go up one level in this thread
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
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