Zeller Defense, Soller Attack

The Soller Attack arises when White meets the Zeller Defense with 4. f3 Nf6 and then plays 5. Bc4. The bishop develops toward f7, and the tension on e4 is left unresolved. Black stays a pawn up and can hold the extra pawn with 5...e6, the most common reply, or capture with 5...exf3. Engines clearly favor Black and prefer 5...Nc6, which also gives Black the best results. Black wins more often than White in online games.