Author: Landon Rabern
Date: 14:37:45 06/02/03
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On June 02, 2003 at 16:52:47, Slobodan R. Stojanovic wrote: >For now there are three engines that play FRC: > >1. Betsy >2. Chispa >3. Baron (The Baron) > >but there are still some problems with castling rules. > >For me two points were very importante to understand the FRC castling rules: > >a) squares between King and Rook must be empty, like in classic chess >b) destination squares must be empty as well (it is obvious) - g1&f1 (g8&f8) for >H castling, c1&d1 (c8&d8) for A castling >c) but squares between H castling rook and H castling destination squares (f1g1 >- f8g8) MAY BE FILLED; or squares between A castling rook and A castling >destination squares (c1d1 - c8d8) MAY BE FILLED. > >For example: If we have a white position >rook on a1 >king on b1 >rook on d1 >after H castling we´ll have king on g1 and rook on f1. > >Conditions for H castling realization: >a) C square, the square between king and H castling rook on D square, must be >empty, and not attacked (king musnt be under check ...) >b) F1 and G1 squares must be free. >c) E square, however MAY BE OCCUPIED BY ANY WHITE PIECE WITHOUT PROBLEM. > >In these kind of cases we have some kind of MAGIC move. > >It seems that Chispa handles well these situations, but Betsy and Baron admitt >castling only when all squares between king rook and destination squars are >empty. Reinhard and I had a long discussion about this in the FCP forum. The original rules are ambiguous in this regard. In the end we decided that it made more sense to not allow castling when there are pieces between king/rook and their destination squares. Later, I saw that the rules on ICC concur. As far as not being able to handle an illegal move, Betsy will report "Illegal Move". The interface really should not allow the user to input an illegal move and I sure it will be fixed. Regards, Landon
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