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<span id="Castling"></span>
==Castling ability==
If neither side can castle, the symbol '-' is used, otherwise each of four individual [[Castling rightsRights|castling rights]] for king and queen castling for both sides are indicated by a sequence of one to four letters.
<pre>
<Castling ability> ::= '-' | ['K'] ['Q'] ['k'] ['q'] (1..4)
