Janowski Variation, Fianchetto Variation

The Fianchetto Variation of the Janowski Variation answers 3...Bf5 with 4. g3. This prepares Bg2, aiming White's light-squared bishop down the long diagonal toward b7, a pawn the departed c8-bishop no longer guards. Black most often replies 4...Nbd7 or 4...c6, the latter reinforcing the queenside, while 4...e6 and 4...e5 are among the engine's preferred moves. Engines give White a slight edge. The line is rarely played, and Lichess results are even.