r1bqk1r1/pQ1p4/2p2n2/4Nppp/6P1/Nn1PP2P/1R1b1P2/3K1B1R w q - 2 23
FEN state: r1bqk1r1/pQ1p4/2p2n2/4Nppp/6P1/Nn1PP2P/1R1b1P2/3K1B1R w q - 2 23 ; Best move: b7a8
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8 and black rook at g8. Black pawn at a7, white queen at b7 and black pawn at d7. Black pawn at c6 and black knight at f6. White knight at e5, black pawn at f5, black pawn at g5 and black pawn at h5. White pawn at g4. White knight at a3, black knight at b3, white pawn at d3, white pawn at e3 and white pawn at h3. White rook at b2, black bishop at d2 and white pawn at f2. White king at d1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 2. Full move number is 23. White to move.