r1b2b1r/p1k1p2p/np3n2/1qPpPpP1/2B5/P6P/1BPP2PR/RN1QK3 w Q - 5 16
FEN state: r1b2b1r/p1k1p2p/np3n2/1qPpPpP1/2B5/P6P/1BPP2PR/RN1QK3 w Q - 5 16 ; Best move: c4b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black bishop at f8 and black rook at h8. Black pawn at a7, black king at c7, black pawn at e7 and black pawn at h7. Black knight at a6, black pawn at b6 and black knight at f6. Black queen at b5, white pawn at c5, black pawn at d5, white pawn at e5, black pawn at f5 and white pawn at g5. White bishop at c4. White pawn at a3 and white pawn at h3. White bishop at b2, white pawn at c2, white pawn at d2, white pawn at g2 and white rook at h2. White rook at a1, white knight at b1, white queen at d1 and white king at e1. White queenside is the only castle move available. Half move number is 5. Full move number is 16. White to move.