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1

Obviously the Rossolimo is a less ambitious option than the Open Sicilian. It is, however, easier to learn for white, less risky and less sharp and so likely to be less the cup of tea of ardent Sicilian players. Those are probably the main reasons for its popularity.


2

The queen on d2 allows for a future Bh6 exchanging the bishops and preparing a h4-h5 push with a strong attack for White. With Qd3, you are exposing it to attack (...Nc6-e5 is a typical maneuvre in this type of posiiton). You also prevent your bishop from going to c4 which is a typical square where it's placed. Also note that Black's ...e6 is a very bad move,...


4

Without giving a long, drawn out explanation, the simple answer is that you're decreasing the mobility of the queen. The queen only has three legal moves from d3 and all of them waste time. Qd2 loses a tempo since you could have played Qd2 the move before. Same with Qe2. Qd1 wastes two moves. The value of moves comes from the value of the pieces and the ...


11

Qd2 is used in these lines to support the Be3, which is typically played to h6 to exchange for the Bg7, followed by a pawn attack on the king-side.


13

One of Black's development plans will include moves like Nd7 intending Ne5 hitting the Q and Bishop if the Q is on d3. This will cost White an important tempo in this dynamic opening. Black's plans revolve around control of the c4 square hoping to place a piece on this square. Depending on White's particular move order Black may play b5, Bb7, Nd7, Nb6, Nc4, ...


3

For a more meaningful answer, it'd be a great idea to know what your current skill level is. That being said: Knowing an opening is not about knowing "what's on the book". If you can't find the correct response when your opponent deviates, then to all practical effects it's as if you didn't know anything the opening, no matter how depth into the ...


6

Please note that the ...e5 push Black does on your line is not forced and there are plenty of other variations Black can opt for (like 4...e6, or 4...g6, or 4...Nf6 5.Nc3 d6, or even 4...e5) Each of this alternatives requires White to be prepared as Black will probably know a lot of theory about those (and have a good understanding of the resulting ...


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