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3 changes: 2 additions & 1 deletion uci-specification.txt
Original file line number Diff line number Diff line change
Expand Up @@ -528,7 +528,8 @@ the engine that is should play according to the Chess960 rules.
This is done by the special engine option UCI_Chess960. If the engine knows about Chess960
it should send the command 'option name UCI_Chess960 type check default false'
to the GUI at program startup.
Whenever a Chess960 game is played, the GUI should set this engine option to 'true'.
Whenever a Chess960 game is played, the GUI should set this engine option to 'true':
setoption name UCI_Chess960 value true

Castling is different in Chess960 and the white king move when castling short is not always e1g1.
A king move could both be the castling king move or just a normal king move.
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