2r1k2r/pb2bppp/n2p1P2/2pPp3/Np2P3/q1PQB1RP/PP3P2/RN2KB2 b Q - 3 20
FEN state: 2r1k2r/pb2bppp/n2p1P2/2pPp3/Np2P3/q1PQB1RP/PP3P2/RN2KB2 b Q - 3 20 ; Best move: a3a4
The current state of the chess board is: Black rook at c8, black king at e8 and black rook at h8. Black pawn at a7, black bishop at b7, black bishop at e7, black pawn at f7, black pawn at g7 and black pawn at h7. Black knight at a6, black pawn at d6 and white pawn at f6. Black pawn at c5, white pawn at d5 and black pawn at e5. White knight at a4, black pawn at b4 and white pawn at e4. Black queen at a3, white pawn at c3, white queen at d3, white bishop at e3, white rook at g3 and white pawn at h3. White pawn at a2, white pawn at b2 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 3. Full move number is 20. Black to move.