Insisting on the g4-g5 idea.

White has a decisive attack.

Eliminating Black's most active piece, after which his underdeveloped queenside will become more notable.

With the double threat of 4 Rxd4 and 4 Re4.

With the decisive threat of 7 Re8+. White won just a few moves later.

Trying to exchange, or at least dislodge the active black rook.

Or 1...Rxc1 2.Rxc1 Bd6 3.Na4! , heading for c5 or b6, when 3...Bxf4? fails to 4.Qxf4.

White just sends his passed pawns forward with a clear advantage.