r1b2bn1/p2qpkp1/2n2ppr/1ppp4/2P1P3/1P5N/P2P1PPP/RNB1KBR1 w Q - 1 10
FEN state: r1b2bn1/p2qpkp1/2n2ppr/1ppp4/2P1P3/1P5N/P2P1PPP/RNB1KBR1 w Q - 1 10 ; Best move: c4d5
The current state of the chess board is: Black rook at a8, black bishop at c8, black bishop at f8 and black knight at g8. Black pawn at a7, black queen at d7, black pawn at e7, black king at f7 and black pawn at g7. Black knight at c6, black pawn at f6, black pawn at g6 and black rook at h6. Black pawn at b5, black pawn at c5 and black pawn at d5. White pawn at c4 and white pawn at e4. White pawn at b3 and white knight at h3. White pawn at a2, white pawn at d2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white king at e1, white bishop at f1 and white rook at g1. White queenside is the only castle move available. Half move number is 1. Full move number is 10. White to move.