Author: Reinhard Scharnagl
Date: 14:23:46 09/10/03
Go up one level in this thread
Hi Dieter, >About castling and FRC. Reinhard made some good suggestions, but I would think >even cleaner would be, to use the column of the rook. So in normal chess, wqWQ >would be ahAH. This would easily generalize to FRC positions. well this is a clean and usable approach. The problem would be, that this suggestion is not backwards compatible to old FEN. For not to devalue old data, new FEN reading programs would be forced to understand two different versions of FEN. My proposal is not that pretty as yours, but instead it is fully compatible with the old FEN. >About e.p. target. I think everybody would agree, that it is better, when it >is only set, when the pawn has a neighbour, than can capture. One should also >define, what to do in the case, that the neighbour is pinned to the K, so that >it cannot take. Perhaps, allow in this rare case to have ep set or unset. I would like not to demand any playability of an e.p. capture, when an e.p. position has beed encoded in FEN. I argue for simply signaling by the e.p. flag, that a pawn just has performed a double step, placing it immediately near one or two hostile pawns at the right or left. A missing of that flag, when any e.p. capture would not be legal, could be tolerated, but should not be the rule. Not every FEN producing system is aware to generate legal moves. Those programs should not be forced to additionaly implement yet not really needed chess knowledge. Regards, Reinhard.
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