Allgaier Gambit, Thorold Attack

The Thorold Attack is White's alternative to the Urusov Attack's 7. Bc4+ after the knight sacrifice on f7. Instead of giving check, 7. d4 places pawns on d4 and e4 and opens the c1-bishop's diagonal toward the f4-pawn, with play aimed at the uncastled king on the half-open f-file. Engines give Black, a piece up, a large advantage. 7...d5 is the most common reply, and 7...Nf6 and 7...f3 are also suggested. The line is rarely played.