rnb1k3/pp1p1prp/2p5/4pP2/2PP2p1/b1BK3P/PP2NPP1/R3QB1R b q - 0 18
FEN state: rnb1k3/pp1p1prp/2p5/4pP2/2PP2p1/b1BK3P/PP2NPP1/R3QB1R b q - 0 18 ; Best move: a3f8
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8 and black king at e8. Black pawn at a7, black pawn at b7, black pawn at d7, black pawn at f7, black rook at g7 and black pawn at h7. Black pawn at c6. Black pawn at e5 and white pawn at f5. White pawn at c4, white pawn at d4 and black pawn at g4. Black bishop at a3, white bishop at c3, white king at d3 and white pawn at h3. White pawn at a2, white pawn at b2, white knight at e2, white pawn at f2 and white pawn at g2. White rook at a1, white queen at e1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 18. Black to move.