r1b1k3/p1p1n1pr/1p2p1n1/4p2p/1bPpPPP1/BP1P4/P2NB2P/RQ1K3R w q - 0 16
FEN state: r1b1k3/p1p1n1pr/1p2p1n1/4p2p/1bPpPPP1/BP1P4/P2NB2P/RQ1K3R w q - 0 16 ; Best move: a3b4
The current state of the chess board is: Black rook at a8, black bishop at c8 and black king at e8. Black pawn at a7, black pawn at c7, black knight at e7, black pawn at g7 and black rook at h7. Black pawn at b6, black pawn at e6 and black knight at g6. Black pawn at e5 and black pawn at h5. Black bishop at b4, white pawn at c4, black pawn at d4, white pawn at e4, white pawn at f4 and white pawn at g4. White bishop at a3, white pawn at b3 and white pawn at d3. White pawn at a2, white knight at d2, white bishop at e2 and white pawn at h2. White rook at a1, white queen at b1, white king at d1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 16. White to move.