rn2qbr1/p3k2p/4pp1n/2pp4/1p1N2P1/BPP3P1/P2PBP2/RN1QKR2 b Q - 0 16
FEN state: rn2qbr1/p3k2p/4pp1n/2pp4/1p1N2P1/BPP3P1/P2PBP2/RN1QKR2 b Q - 0 16 ; Best move: b4a3
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black king at e7 and black pawn at h7. Black pawn at e6, black pawn at f6 and black knight at h6. Black pawn at c5 and black pawn at d5. Black pawn at b4, white knight at d4 and white pawn at g4. White bishop at a3, white pawn at b3, white pawn at c3 and white pawn at g3. White pawn at a2, white pawn at d2, white bishop at e2 and white pawn at f2. White rook at a1, white knight at b1, white queen at d1, white king at e1 and white rook at f1. White queenside is the only castle move available. Half move number is 0. Full move number is 16. Black to move.