Ponziani Opening, Jaenisch Counterattack

Algebraic notation combines a letter and number; c3 is column c, row three. The Ponziani is marked by White’s c-pawn advance to c3. That pawn prepares a center with d4, but it also occupies c3, the square normally used by the b1-knight. The Jaenisch Counterattack answers by moving the black knight to f6 and immediately attacking White’s pawn on e4.

White commonly continues with d4, pursuing the central plan instead of defending e4 passively. Central captures can then open files and diagonals for the pieces. Black tries to show that White’s preparation was slow, while White tries to show that the broad center compensates for temporarily restricting the b1-knight.

The word counterattack describes the logic well: Black does not wait for White to build the center, but attacks its base immediately. Capturing a central pawn without checking the replies can still open lines against Black’s own king. The variation works by combining pressure on e4 while bringing pieces into play, not by chasing a pawn at any cost.