In our third installment on the Rossolimo anti-sicilian, we turn to the variation 4.0-0. This move is probably the most common, since it rapidly develops white’s kingside and seeks information from black. When I play the Rossolimo with the white pieces, this is the variation that I favor. Below, I will outline a unique idea for white which might be objectively worse but has given me great practical chances over the board. Keeping in mind that all of the ideas presented in the earlier two posts are equally relevant here considering the wealth of transpositional possibilities in this variation, I would like to look at the following position as the main starting tabiya for this post. This position occurs after the moves: 1.e4 c5 2.Nf3 Nc6 3. Bb5 g6 4.0-0 Bg7 5.Re1, when black has several moves at his disposal, though the two most common choices are either the solid e5, or the dynamic Nf6.