r2qkbnr/3ppp2/np4p1/2BP4/2Q1P3/5PNp/P7/RN2KB1R b KQ - 1 21
FEN state: r2qkbnr/3ppp2/np4p1/2BP4/2Q1P3/5PNp/P7/RN2KB1R b KQ - 1 21 ; Best move: a6c5
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at d7, black pawn at e7 and black pawn at f7. Black knight at a6, black pawn at b6 and black pawn at g6. White bishop at c5 and white pawn at d5. White queen at c4 and white pawn at e4. White pawn at f3, white knight at g3 and black pawn at h3. White pawn at a2. White rook at a1, white knight at b1, white king at e1, white bishop at f1 and white rook at h1. White kingside and white queenside castles are available. Half move number is 1. Full move number is 21. Black to move.