r2qkbnr/4p3/np1pbp1p/p5p1/2PpPP2/PQ4P1/1P1KB2P/RNB3NR b kq - 1 21
FEN state: r2qkbnr/4p3/np1pbp1p/p5p1/2PpPP2/PQ4P1/1P1KB2P/RNB3NR 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 e7. Black knight at a6, black pawn at b6, black pawn at d6, black bishop at e6, black pawn at f6 and black pawn at h6. Black pawn at a5 and black pawn at g5. White pawn at c4, black pawn at d4, white pawn at e4 and white pawn at f4. White pawn at a3, white queen at b3 and white pawn at g3. White pawn at b2, white king at d2, white bishop at e2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white knight at g1 and white rook at h1. Black kingside and black queenside castles are available. Half move number is 1. Full move number is 21. Black to move.