rnb1kb1r/2ppq3/1p2p2p/p1B2pnP/2P2pP1/PP2P2R/R2PB3/1N1QK1N1 w q - 1 21
FEN state: rnb1kb1r/2ppq3/1p2p2p/p1B2pnP/2P2pP1/PP2P2R/R2PB3/1N1QK1N1 w q - 1 21 ; Best move: c5e7
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at c7, black pawn at d7 and black queen at e7. Black pawn at b6, black pawn at e6 and black pawn at h6. Black pawn at a5, white bishop at c5, black pawn at f5, black knight at g5 and white pawn at h5. White pawn at c4, black pawn at f4 and white pawn at g4. White pawn at a3, white pawn at b3, white pawn at e3 and white rook at h3. White rook at a2, white pawn at d2 and white bishop at e2. White knight at b1, white queen at d1, white king at e1 and white knight at g1. Black queenside is the only castle move available. Half move number is 1. Full move number is 21. White to move.