1rbqkr2/pppppp1p/7b/6p1/P1P4P/N3P1PB/n2P3N/R1BQK1R1 b Q - 0 12
FEN state: 1rbqkr2/pppppp1p/7b/6p1/P1P4P/N3P1PB/n2P3N/R1BQK1R1 b Q - 0 12 ; Best move: a2b4
The current state of the chess board is: Black rook at b8, black bishop at c8, black queen at d8, black king at e8 and black rook at f8. Black pawn at a7, black pawn at b7, black pawn at c7, black pawn at d7, black pawn at e7, black pawn at f7 and black pawn at h7. Black bishop at h6. Black pawn at g5. White pawn at a4, white pawn at c4 and white pawn at h4. White knight at a3, white pawn at e3, white pawn at g3 and white bishop at h3. Black knight at a2, white pawn at d2 and white knight at h2. White rook at a1, white bishop at c1, white queen at d1, white king at e1 and white rook at g1. White queenside is the only castle move available. Half move number is 0. Full move number is 12. Black to move.