> 
> The game plays through a castling move ok.
> Geez, i see you've altered the FEN format. Or is the FCfc castling field a
> language thing ? From this FEN i can successfully castle 'OK' and 'OQ' :
> "bnrbkrqn/ppp5/3pppp1/7p/5P2/2N1PBN1/PPPP1QPP/B1R1KR2 w FCfc - 0 7"
> but the two-move castling (which i confess i don't know much about but i think
> you're aiming to support) on queen side doesn't work. Shouldn't i be able to 
> move
> Rd1, and then Kc1 on the next move , or am i mistaken ?.
> 

The FCfc field is Shredder FEN, which is used by UCI engines. There is
also X-FEN, which is closer to standard FEN, but as Shredder FEN is
definitely needed and X-FEN isn't I've chosen to go with Shredder FEN.
It should be able to read both versions.

At the moment castling is done by moving the king to the target square,
i.e. c1, g1, c8 or g8. If it's ambiguous then Scid will ask if you're
castling or not. The other approaches are to use the king to take the
rook you intend to castle with, which is the UCI approach, or to have
buttons for O-O-O and O-O. None of these seem to be ideal, but I felt
that moving the king to the target square fitted in better with normal
chess. Having a two part castling move would also be possible but seems
needless complex. In particular you'd need to have some way to tell Scid
that Rd1 was the first part of castling, and not a move in it's own
right.

Ben Hague


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