rn2bb1r/p3p3/2p2k1n/2qP1p1p/N5pP/BP3PP1/P1PP3R/RN1QKB2 w Q - 1 18
FEN state: rn2bb1r/p3p3/2p2k1n/2qP1p1p/N5pP/BP3PP1/P1PP3R/RN1QKB2 w Q - 1 18 ; Best move: a4c5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at e8, black bishop at f8 and black rook at h8. Black pawn at a7 and black pawn at e7. Black pawn at c6, black king at f6 and black knight at h6. Black queen at c5, white pawn at d5, black pawn at f5 and black pawn at h5. White knight at a4, black pawn at g4 and white pawn at h4. White bishop at a3, white pawn at b3, white pawn at f3 and white pawn at g3. White pawn at a2, white pawn at c2, white pawn at d2 and white rook at h2. White rook at a1, white knight at b1, white queen at d1, white king at e1 and white bishop at f1. White queenside is the only castle move available. Half move number is 1. Full move number is 18. White to move.