rn1bkr2/pp3ppp/n2pb3/4PP1P/1Q6/N2PP3/PPP3BR/R1B1K3 b Q - 4 18
FEN state: rn1bkr2/pp3ppp/n2pb3/4PP1P/1Q6/N2PP3/PPP3BR/R1B1K3 b Q - 4 18 ; Best move: a6b4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at d8, black king at e8 and black rook at f8. Black pawn at a7, black pawn at b7, black pawn at f7, black pawn at g7 and black pawn at h7. Black knight at a6, black pawn at d6 and black bishop at e6. White pawn at e5, white pawn at f5 and white pawn at h5. White queen at b4. White knight at a3, white pawn at d3 and white pawn at e3. White pawn at a2, white pawn at b2, white pawn at c2, white bishop at g2 and white rook at h2. White rook at a1, white bishop at c1 and white king at e1. White queenside is the only castle move available. Half move number is 4. Full move number is 18. Black to move.