rn3bnr/p2bp1k1/q4ppp/1Npp1P2/1P2P1PP/3PQ2B/PBP5/RN2K2R b KQ - 0 20
FEN state: rn3bnr/p2bp1k1/q4ppp/1Npp1P2/1P2P1PP/3PQ2B/PBP5/RN2K2R b KQ - 0 20 ; Best move: a6b5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black bishop at d7, black pawn at e7 and black king at g7. Black queen at a6, black pawn at f6, black pawn at g6 and black pawn at h6. White knight at b5, black pawn at c5, black pawn at d5 and white pawn at f5. White pawn at b4, white pawn at e4, white pawn at g4 and white pawn at h4. White pawn at d3, white queen at e3 and white bishop at h3. White pawn at a2, white bishop at b2 and white pawn at c2. White rook at a1, white knight at b1, white king at e1 and white rook at h1. White kingside and white queenside castles are available. Half move number is 0. Full move number is 20. Black to move.