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[FEN "r3k2r/pbp2p1p/1pn2p2/3qp3/3P4/P1PBPN2/5PPP/1R1QK2R b Kkq"]
12... O-O-O
w
b
wb
bw
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w
b
wb
bw
b
an
12...O-O-O
an