r1q1kbnr/p3pbp1/1p6/2Pp1p1p/PQPPP2P/8/2N1P1PB/RNK2BR1 w k - 0 20
FEN state: r1q1kbnr/p3pbp1/1p6/2Pp1p1p/PQPPP2P/8/2N1P1PB/RNK2BR1 w k - 0 20 ; Best move: b4b5
The current state of the chess board is: Black rook at a8, black queen at c8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black pawn at e7, black bishop at f7 and black pawn at g7. Black pawn at b6. White pawn at c5, black pawn at d5, black pawn at f5 and black pawn at h5. White pawn at a4, white queen at b4, white pawn at c4, white pawn at d4, white pawn at e4 and white pawn at h4. White knight at c2, white pawn at e2, white pawn at g2 and white bishop at h2. White rook at a1, white knight at b1, white king at c1, white bishop at f1 and white rook at g1. Black kingside is the only castle move available. Half move number is 0. Full move number is 20. White to move.