r1b3nB/n1pk4/3b2p1/1Q3p2/3P1pPp/N1P1P3/PP2K2P/R4BNR b - - 0 21
FEN state: r1b3nB/n1pk4/3b2p1/1Q3p2/3P1pPp/N1P1P3/PP2K2P/R4BNR b - - 0 21 ; Best move: a7b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black knight at g8 and white bishop at h8. Black knight at a7, black pawn at c7 and black king at d7. Black bishop at d6 and black pawn at g6. White queen at b5 and black pawn at f5. White pawn at d4, black pawn at f4, white pawn at g4 and black pawn at h4. White knight at a3, white pawn at c3 and white pawn at e3. White pawn at a2, white pawn at b2, white king at e2 and white pawn at h2. White rook at a1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.