3qkb1r/pbppn3/1r2pppp/PQ6/RPpN4/2P4P/n2PKP2/1NB5 w k - 1 21
FEN state: 3qkb1r/pbppn3/1r2pppp/PQ6/RPpN4/2P4P/n2PKP2/1NB5 w k - 1 21 ; Best move: a5b6
The current state of the chess board is: Black queen at d8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7, black bishop at b7, black pawn at c7, black pawn at d7 and black knight at e7. Black rook at b6, black pawn at e6, black pawn at f6, black pawn at g6 and black pawn at h6. White pawn at a5 and white queen at b5. White rook at a4, white pawn at b4, black pawn at c4 and white knight at d4. White pawn at c3 and white pawn at h3. Black knight at a2, white pawn at d2, white king at e2 and white pawn at f2. White knight at b1 and white bishop at c1. Black kingside is the only castle move available. Half move number is 1. Full move number is 21. White to move.