Chameleon Variation

Here's the Sicilian Defense: Closed Variation, Chameleon Variation. It may look strange, as both the light-squared bishop and queen are shut in, and castling might seem some way off. Transpositions back to more common lines are easily achieved with d4, but being an unusual reply to the sicilian things can quickly go out-of-book.

The perks are that

1)   f4 is preserved. 

2)   Every so often black with reply with e5. This is the second most common reply in chess.com games, and the main reason I like the Chameleon. You lose control of a few important squares, but get to post a very strong piece on d5. The three games below all follow this line. I've included one by Fischer, to give the opening some cred.

I think I will give it a try also! But please don't tell anybody!

good combination!

Another thing is its flexibility: White can opt for a Closed with g3 and Bg2 or open it if black does not play e5

love the fact I can later play f4 for a stronger center

I start with the Keres Variation, and sometimes end up with this one. I like it!

Is Nge2 the move that makes it the Chameleon Variation?

@misorook yes

The reason that this may be a very strong system is that white can whenever he like transpose to the open sicilian.

I would advice anyone playing this system with the move order; e4, Nc3, Nge2, g3, Bg2. After these moves you can evaluate the position and decide whether an open sicilian with g3, is the best course, or if you want to stick with d3. 

Also, some sicilian players have different systems against the closed sicilian than what they usually play against the open sicilian, which makes it very useful for official games when you got time to prepare against your opponent. You may find holes in your opponents repertoire and force him to play variations that he does not know.