Author: Reinhard Scharnagl
Date: 00:52:37 07/18/05
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Eduard, well, let me assist you with some simple strategies to separate those artificial Winboard 'variants': "normal", "nocastle" and "fischerandom". Viewing played whole games in PGN chess files this is extremly simple: If there is no "SetUp" (and "FEN") tag, you are facing a traditional chess game, if there is only a "-" used as castling tag, you will have a shuffle chess game. If you would only have a single FEN string at hands, you will be able to make a compatible decision by following criteria: If the X-FEN would have elements unknown to FEN or there are castling rights concerning unusual K-R placements, you will have a Chess960 position. If else there are any castling rights encoded, this would be a position compatible to traditional chess, which is of course also an element of the Chess960 superset. Any cases left could compatibly belong as well to Shuffle Chess, traditional Chess and Chess960. Because of a lot engines are claiming to support legal traditional chess positions only and thus filtering inserted FEN strings, there is no problem. All that tasks would for sure not be easier using the incompatible Shredder-FEN. Reinhard.
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