Author: Heiner Marxen
Date: 06:37:42 09/11/03
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On September 10, 2003 at 17:23:46, Reinhard Scharnagl wrote: >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. I agree completely. >Regards, Reinhard. Heiner
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