5n1r/rb1kqp2/1ppbp3/p2p4/2N4p/PP1P1P2/RBPQP1PP/4KBNR w K - 4 23
FEN state: 5n1r/rb1kqp2/1ppbp3/p2p4/2N4p/PP1P1P2/RBPQP1PP/4KBNR w K - 4 23 ; Best move: c4d6
The current state of the chess board is: Black knight at f8 and black rook at h8. Black rook at a7, black bishop at b7, black king at d7, black queen at e7 and black pawn at f7. Black pawn at b6, black pawn at c6, black bishop at d6 and black pawn at e6. Black pawn at a5 and black pawn at d5. White knight at c4 and black pawn at h4. White pawn at a3, white pawn at b3, white pawn at d3 and white pawn at f3. White rook at a2, white bishop at b2, white pawn at c2, white queen at d2, white pawn at e2, white pawn at g2 and white pawn at h2. White king at e1, white bishop at f1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 4. Full move number is 23. White to move.