rnb1k3/pp1pr3/2pb1np1/8/3qp3/R3B2P/1PP2PP1/3QKBR1 b q - 2 18
FEN state: rnb1k3/pp1pr3/2pb1np1/8/3qp3/R3B2P/1PP2PP1/3QKBR1 b q - 2 18 ; Best move: d6b4
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 and black rook at e7. Black pawn at c6, black bishop at d6, black knight at f6 and black pawn at g6. Black queen at d4 and black pawn at e4. White rook at a3, white bishop at e3 and white pawn at h3. White pawn at b2, white pawn at c2, white pawn at f2 and white pawn at g2. White queen at d1, white king at e1, white bishop at f1 and white rook at g1. Black queenside is the only castle move available. Half move number is 2. Full move number is 18. Black to move.