r1B1k1n1/p3pp2/8/1pqp4/PPpnP2p/8/R1Pb1KPP/1NB3NR w q - 2 21
FEN state: r1B1k1n1/p3pp2/8/1pqp4/PPpnP2p/8/R1Pb1KPP/1NB3NR w q - 2 21 ; Best move: b4c5
The current state of the chess board is: Black rook at a8, white bishop at c8, black king at e8 and black knight at g8. Black pawn at a7, black pawn at e7 and black pawn at f7. Black pawn at b5, black queen at c5 and black pawn at d5. White pawn at a4, white pawn at b4, black pawn at c4, black knight at d4, white pawn at e4 and black pawn at h4. White rook at a2, white pawn at c2, black bishop at d2, white king at f2, white pawn at g2 and white pawn at h2. White knight at b1, white bishop at c1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 2. Full move number is 21. White to move.