Catch castling notation (kingside O-O or queenside O-O-O, each O written as the letter O or the digit 0).
O alone, four-group, no-dash OO, lowercase, double-dash all rejected.
@anchor_anne⚡⚡⚡⚡⚡PAR 19Mixed2 players · 2 solves · 2 views
About this hunt
5 words to catch, 5 words to spare. It mixes several techniques. Added 29 Jun by @anchor_anne.
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