r1b1k3/1pp2ppr/1n1p4/p7/PnBqP1pP/3P1P2/RQ1N4/4K1RN w q - 0 23
FEN state: r1b1k3/1pp2ppr/1n1p4/p7/PnBqP1pP/3P1P2/RQ1N4/4K1RN w q - 0 23 ; Best move: b2d4
The current state of the chess board is: Black rook at a8, black bishop at c8 and black king at e8. Black pawn at b7, black pawn at c7, black pawn at f7, black pawn at g7 and black rook at h7. Black knight at b6 and black pawn at d6. Black pawn at a5. White pawn at a4, black knight at b4, white bishop at c4, black queen at d4, white pawn at e4, black pawn at g4 and white pawn at h4. White pawn at d3 and white pawn at f3. White rook at a2, white queen at b2 and white knight at d2. White king at e1, white rook at g1 and white knight at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 23. White to move.