1rb1r3/pp1k2p1/n4p1p/2p3BP/5QP1/4N1R1/PqP1PP2/RN2KB2 b Q - 1 20
FEN state: 1rb1r3/pp1k2p1/n4p1p/2p3BP/5QP1/4N1R1/PqP1PP2/RN2KB2 b Q - 1 20 ; Best move: b2a1
The current state of the chess board is: Black rook at b8, black bishop at c8 and black rook at e8. Black pawn at a7, black pawn at b7, black king at d7 and black pawn at g7. Black knight at a6, black pawn at f6 and black pawn at h6. Black pawn at c5, white bishop at g5 and white pawn at h5. White queen at f4 and white pawn at g4. White knight at e3 and white rook at g3. White pawn at a2, black queen at b2, white pawn at c2, white pawn at e2 and white pawn at f2. White rook at a1, white knight at b1, 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 20. Black to move.