Author: José Carlos
Date: 17:33:25 12/02/04
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On December 02, 2004 at 15:56:30, Uri Blass 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. > >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. Yes, this is true in many cases. However, if a rook can enter enemy's position, it'll probably attack weak pawns too. >> 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. I don't do it in Averno either, because it's expensive. I do it when I play chess myself though, and it's really important. In my other program Anubis, where I have attack bitmaps in every internal node, this is almost free to check, and I have seen it has a clear positive effect in playing strength. >checking if an enemy pawn in the same file is protected by a pawn is more easy >to do and I may do it. Yes, that's what I do in Averno. >Uri José C.
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