r4bnr/3ppk1p/bq3p2/pBP1nPp1/1Q1PP3/P1P3P1/5N1P/R1B1K1NR b KQ - 0 21
FEN state: r4bnr/3ppk1p/bq3p2/pBP1nPp1/1Q1PP3/P1P3P1/5N1P/R1B1K1NR b KQ - 0 21 ; Best move: a5b4
The current state of the chess board is: Black rook at a8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at d7, black pawn at e7, black king at f7 and black pawn at h7. Black bishop at a6, black queen at b6 and black pawn at f6. Black pawn at a5, white bishop at b5, white pawn at c5, black knight at e5, white pawn at f5 and black pawn at g5. White queen at b4, white pawn at d4 and white pawn at e4. White pawn at a3, white pawn at c3 and white pawn at g3. White knight at f2 and white pawn at h2. White rook at a1, white bishop at c1, white king at e1, white knight at g1 and white rook at h1. White kingside and white queenside castles are available. Half move number is 0. Full move number is 21. Black to move.