Any recommendations vs Sicilian, Scandinavian and Zukertort?

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The most respected anti-Sicilian is the Rossolimo Attack / Moscow Var.

@Achyut_2013 play 1.f4 and you won't meet all these openings

@hydroshadow said in #3:
> @Achyut_2013 play 1.f4 and you won't meet all these openings
As white I'm a e4 e5 player and I've never played 1.f4, switching might decrease the level of my game as I don't know any theory and how to play

Zukertort is a white opening. Just play in the same way as against 1.c4 or 1.d4 unless you play 1...e5 of course.

Sicilian is a black opening. There are no recommandations. You can play some sideline 2.c3, 2.a3 or 2.Be2. If you play 2.Nf3 you have to learn a LOT of opening theory.

Against Scandinavian you can play 3.Nf3. There is only one good way to play against it: Bg4 followed by Nc6 and 0-0-0. If black plays an early Nf6 it is already quite bad for black.
Against the recommended line in the books you can sacrifice a pawn for full compensation according to Stockfish.
You can study this master game: lichess.org/dJLBSf46. black will usually mess up quickly like here.
If black plays h5 instead of Bh5 you certainly don't take the bishop. You also sacrifice a pawn with d4 followed by Nd2 and Qe2 after Ne5.

Hello greetings to all I have played the grand prix against the Sicilian and against the Scandinavian I play the line of Nf3 Bg5 Be2 c6 c4 and it worked for me, against the Zukertort I have no lines because I do not respond to d4 with d5 I use other defenses I would have to review my notes to see that I have greetings and successes

Grand Prix is quite fun against sicilian, but traditional closed sicilian and Alapin are low theory sidelines as well.

Against Scandi, you take the pawn, take the center with d4 and play chess.

Open Sicilian is the most fun. The Nf3 line described above leads to an interesting game vs Scandanavian. There is also 1. e4 d5 2. exd and if Nf6 3. c4 transposing to the Panov.

Here is a book that sets out to help the reader with sample games illustrating how White can play after 1 e4:
My First Chess Opening Repertoire for White
www.newinchess.com/media/wysiwyg/product_pdf/9033.pdf
chessbookreviews.wordpress.com/tag/vincent-moret/
Both 1 e4 c5 and 1 e4 d5 are discussed.

"... There is no doubt in my mind that if you really want to test the Sicilian then you have to play the main lines of the Open Sicilian. The problem is that there are just so many of them ... and keeping up with developments in all of them is a substantial task. ... as you become older, with other demands on your time (family, job, etc.) then it becomes more and more difficult to keep up with everything. At this stage it may make sense to reduce your theoretical overhead by adopting one of the 'lesser' lines against the Sicilian: 2 c3, or the Closed Sicilian, or lines with Bb5. ..." - GM John Nunn in part of a 2005 book where he discussed a 1994 game in which he had played 2 c3.