r2qkbnr/p7/2ppNppp/1P6/P1BP2P1/RP3p1P/n4K2/1NBQ3R b kq - 1 20
FEN state: r2qkbnr/p7/2ppNppp/1P6/P1BP2P1/RP3p1P/n4K2/1NBQ3R b kq - 1 20 ; Best move: a2c1
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 a7. Black pawn at c6, black pawn at d6, white knight at e6, black pawn at f6, black pawn at g6 and black pawn at h6. White pawn at b5. White pawn at a4, white bishop at c4, white pawn at d4 and white pawn at g4. White rook at a3, white pawn at b3, black pawn at f3 and white pawn at h3. Black knight at a2 and white king at f2. White knight at b1, white bishop at c1, white queen at d1 and white rook at h1. Black kingside and black queenside castles are available. Half move number is 1. Full move number is 20. Black to move.