r2qkbr1/1p1b2p1/2np1p2/p1p1p1Np/1PP3PP/P3PB1N/3P4/R1BQK2R w K - 0 18
FEN state: r2qkbr1/1p1b2p1/2np1p2/p1p1p1Np/1PP3PP/P3PB1N/3P4/R1BQK2R w K - 0 18 ; Best move: f3d5
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at b7, black bishop at d7 and black pawn at g7. Black knight at c6, black pawn at d6 and black pawn at f6. Black pawn at a5, black pawn at c5, black pawn at e5, white knight at g5 and black pawn at h5. White pawn at b4, white pawn at c4, white pawn at g4 and white pawn at h4. White pawn at a3, white pawn at e3, white bishop at f3 and white knight at h3. White pawn at d2. White rook at a1, white bishop at c1, white queen at d1, white king at e1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 18. White to move.