Author: Reinhard Scharnagl
Date: 15:29:34 11/05/05
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On November 05, 2005 at 16:43:50, Matthias Gemuh wrote: > > >[D]k7/8/8/8/8/8/8/3K3R w K - 0 1 > >Engine is informed when playing SMK-960 chess, so no problems with sending >castle moves. > >Arena and X-FEN don't announce FRC to engine (very bad behaviour). All information needed is already included inside the compatible X-FEN string. So for what should FRC be announced, if the engine already had signalled its FRC awareness to the GUI? An FRC enable engine always could play FRC, there is NO NEED to SWITCH its mode, like the Shredder GUI does, making the handling of Chess960 unnecessaryly amd incompatibly complicated. >Arena says send this castle as O-O. >X-FEN says send this castle as d1g1. This depends also on the protocol. As far as I know UCI is demanding to send regular castling moves by source and target square coordinates. Here the Shredder FEN extension for Chess960 is contradicting itself. E.g. Pseudeo-FRC derived positions have to be handled differently depending on Shredders perspective, ignoring that those perspectives do not change the position at all. Arena has been opened early for FRC still waiting for a compatible official Chess960 extension of the UCI protocol, which was not there. So its behaviour is partially provisional. Now, where an incompatible Shredder FEN extension has been published, waiting longer will make no sense at all. >How can an engine support both Arena-FRC and X-FEN simultaneously ? A way to solve this would be to handle it like SMIRF does it in its used own TMCI protocol. Here COMPATIBLY castlings are sent as follows: a) if the King does more than one single step, King's source and King's destination square coordinates; b) otherwise King's source and involved Rook's source destination square coordinates. By that also a unique gesture has been defined, to signal that move manually to the GUI. This overmore works IDENTICALLY in Chess960 AND traditional Chess. Reinhard.
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