r2q2kr/pbppppbp/8/1p1P2p1/1B2P1n1/NPP2N1P/P2Q1PP1/R3KB1R b Q - 0 15
FEN state: r2q2kr/pbppppbp/8/1p1P2p1/1B2P1n1/NPP2N1P/P2Q1PP1/R3KB1R b Q - 0 15 ; Best move: a7a5
The current state of the chess board is: Black rook at a8, black queen at d8, black king at g8 and black rook at h8. Black pawn at a7, black bishop at b7, black pawn at c7, black pawn at d7, black pawn at e7, black pawn at f7, black bishop at g7 and black pawn at h7. Black pawn at b5, white pawn at d5 and black pawn at g5. White bishop at b4, white pawn at e4 and black knight at g4. White knight at a3, white pawn at b3, white pawn at c3, white knight at f3 and white pawn at h3. White pawn at a2, white queen at d2, white pawn at f2 and white pawn at g2. White rook at a1, white king at e1, white bishop at f1 and white rook at h1. White queenside is the only castle move available. Half move number is 0. Full move number is 15. Black to move.