r1bqkn1r/p3pp2/3p1n2/1pp2P1p/PPP1PB2/N2B1NpP/3P2P1/R2QK2R w KQkq - 1 20
FEN state: r1bqkn1r/p3pp2/3p1n2/1pp2P1p/PPP1PB2/N2B1NpP/3P2P1/R2QK2R w KQkq - 1 20 ; Best move: a4b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black knight at f8 and black rook at h8. Black pawn at a7, black pawn at e7 and black pawn at f7. Black pawn at d6 and black knight at f6. Black pawn at b5, black pawn at c5, white pawn at f5 and black pawn at h5. White pawn at a4, white pawn at b4, white pawn at c4, white pawn at e4 and white bishop at f4. White knight at a3, white bishop at d3, white knight at f3, black pawn at g3 and white pawn at h3. White pawn at d2 and white pawn at g2. White rook at a1, white queen at d1, white king at e1 and white rook at h1. White kingside, white queenside, black kingside and black queenside castles are available. Half move number is 1. Full move number is 20. White to move.