Mate in two vs White to move

Start Analysis Engine to see Solution No. 641 Tactic: Chess, Puzzels | Cleanchess.com | 1 Jul 2015

1010640

[Event "Start Analysis Engine to see Solution No. 641 Tactic: Chess, Puzzels"] [Site "Cleanchess.com"] [Date "2015.07.01"] [Round "0"] [White "Mate in two"] [Black "White to move"] [FEN "4k2r/n1p2p1p/1pp2B2/2p1p2p/8/8/8/R3K2B w Qk - 0 1"] 1.O-O-O Rg8 ( 1...O-O ) *

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