4kb1r/r2bn1pn/1pp4p/1B1p1pP1/pP1PP3/P6Q/2P3KP/RNB4R b k - 2 21
FEN state: 4kb1r/r2bn1pn/1pp4p/1B1p1pP1/pP1PP3/P6Q/2P3KP/RNB4R b k - 2 21 ; Best move: c6b5
The current state of the chess board is: Black king at e8, black bishop at f8 and black rook at h8. Black rook at a7, black bishop at d7, black knight at e7, black pawn at g7 and black knight at h7. Black pawn at b6, black pawn at c6 and black pawn at h6. White bishop at b5, black pawn at d5, black pawn at f5 and white pawn at g5. Black pawn at a4, white pawn at b4, white pawn at d4 and white pawn at e4. White pawn at a3 and white queen at h3. White pawn at c2, white king at g2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1 and white rook at h1. Black kingside is the only castle move available. Half move number is 2. Full move number is 21. Black to move.