r1b1kbr1/3n1p2/pqp2p2/Qp1p1n1p/PPP2p1P/3R4/3PP1PR/1NB1KB2 b q - 3 18
FEN state: r1b1kbr1/3n1p2/pqp2p2/Qp1p1n1p/PPP2p1P/3R4/3PP1PR/1NB1KB2 b q - 3 18 ; Best move: b6a5
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 knight at d7 and black pawn at f7. Black pawn at a6, black queen at b6, black pawn at c6 and black pawn at f6. White queen at a5, black pawn at b5, black pawn at d5, black knight at f5 and black pawn at h5. White pawn at a4, white pawn at b4, white pawn at c4, black pawn at f4 and white pawn at h4. White rook at d3. White pawn at d2, white pawn at e2, white pawn at g2 and white rook at h2. White knight at b1, white bishop at c1, white king at e1 and white bishop at f1. Black queenside is the only castle move available. Half move number is 3. Full move number is 18. Black to move.