r1b2b1r/1p2k1pp/nqpp1pn1/p7/P1PP4/1PN1B1PP/3N1PB1/R2QK1R1 b Q - 12 15
FEN state: r1b2b1r/1p2k1pp/nqpp1pn1/p7/P1PP4/1PN1B1PP/3N1PB1/R2QK1R1 b Q - 12 15 ; Best move: a6b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black bishop at f8 and black rook at h8. Black pawn at b7, black king at e7, black pawn at g7 and black pawn at h7. Black knight at a6, black queen at b6, black pawn at c6, black pawn at d6, black pawn at f6 and black knight at g6. Black pawn at a5. White pawn at a4, white pawn at c4 and white pawn at d4. White pawn at b3, white knight at c3, white bishop at e3, white pawn at g3 and white pawn at h3. White knight at d2, white pawn at f2 and white bishop at g2. White rook at a1, 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 12. Full move number is 15. Black to move.