r1b1kbr1/pp1npp2/4Nn2/2ppP2P/2P2p1P/P4q2/3P1K2/RNBQ1B1R w q - 1 18
FEN state: r1b1kbr1/pp1npp2/4Nn2/2ppP2P/2P2p1P/P4q2/3P1K2/RNBQ1B1R w q - 1 18 ; Best move: d1f3
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at b7, black knight at d7, black pawn at e7 and black pawn at f7. White knight at e6 and black knight at f6. Black pawn at c5, black pawn at d5, white pawn at e5 and white pawn at h5. White pawn at c4, black pawn at f4 and white pawn at h4. White pawn at a3 and black queen at f3. White pawn at d2 and white king at f2. White rook at a1, white knight at b1, white bishop at c1, white queen at d1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 18. White to move.