rnb2bnr/1pqkp1pp/p1pp4/1N3p1P/P2PP1PR/5P2/1PP5/R1BQKBN1 b Q - 2 13
FEN state: rnb2bnr/1pqkp1pp/p1pp4/1N3p1P/P2PP1PR/5P2/1PP5/R1BQKBN1 b Q - 2 13 ; Best move: a6b5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at b7, black queen at c7, black king at d7, black pawn at e7, black pawn at g7 and black pawn at h7. Black pawn at a6, black pawn at c6 and black pawn at d6. White knight at b5, black pawn at f5 and white pawn at h5. White pawn at a4, white pawn at d4, white pawn at e4, white pawn at g4 and white rook at h4. White pawn at f3. White pawn at b2 and white pawn at c2. White rook at a1, white bishop at c1, white queen at d1, white king at e1, white bishop at f1 and white knight at g1. White queenside is the only castle move available. Half move number is 2. Full move number is 13. Black to move.