I have written this blog as just a survey. I want to know the various opininons of players on the given topic-

Which is the best Attack against the french defence, Carro-kan and the sicillian defence???

Please post your answers.

I vote for the kings indian attack.

One could give different answers in terms of opening statistics at GM level or the popularity of some approaches. The Tarrasch is a clear winner for the best approach to the French. It's what a Frenchie faces a lot against players above 2000.

The Caro-kann is a more difficult case. But overall for long-term chances of cracking the caro brick wall I'd say the Panov attack is the way to go.

For the Sicllian I like the Smith Morra gambit. That said, I won easily against it a week ago!!! The closed sicllian is interesting as well.

French, Caro Kann and Sicilian are all main line systems. There is not best attack against it but various ways to meet it depending on your style (and if you know your opponent) his or her style. My prefered methods to deal with the 3 is:

Sicialian: English Setup with f3/Be3/Qd2/0-0-0

French: Advance variation with a3 /b4

Caro Kann: Advance Short variation (although when playing Caro Kann with black I have more trouble with the mainline Nc3)

ut I am asking just one opening that can tackle all these 3 openings with ease. Just as the grunfeld defence can handle the colle opening, london system, Catalan, Queen's pawn opening led by c4 and many more.

To me that is a strange approach. All 3 defences deserve to be handled on their own merits. But yes, you could play the KIA as an attack against all 3.

The KIA can be played against nearly any of Black's opening systems. It does mean that White defers the critical struggle into the middle game, rather than seeking a strong opening pull.

If you use one atatck, make it the KIA against all these.  Otherwise, you need to spend a lot of time learning about the various Black options to the defenses.

Let's get 1 thing clear - NONE of the defenses mentioned are the best defense to 1.e4.  The Sicilian contains the most "winning" chances, but the "best" defense, from a soundness perspective, is 1...e5!

To answer your question:

French - 3.Nc3

Caro-Kann - Advance

Sicilian - Open Sicilian or Closed Sicilian, the rest stink for White.

Just deal with the fact that one "system" doesn't solve the problem.  Also, if White plays a Colle, what you are playing is no longer a "Grunfeld".  It's a Colle System.  That's like saying that you play the Pirc, so if White does 1.d4 and 2.c4, just because you play d6, Nf6, g6, and Bg7 doesn't make it a Pirc.  It's actually at that point a King's Indian Defense.

Having played the French, Caro-Kann, and Sicilian, I can tell you that the KIA is NOT the answer.  It's "OK" (i.e. NOT GREAT) against the French.  It's a horrible line against the Caro-Kann.  Black shoudl immeidately answer with 3...e5!!

The BEST Attack:  1.d4!!  Fischer was WRONG!

While the Tarrasch is playable against the French, 3.Nc3 is clearly the line preferred at all levels when White is playing for a win.  Even Karpov finally gave up the Tarrasch after his matches with Korchnoi.

I like to use the moves e4, d4 and c4 against all the French and
Caro Kann Defenses.

1.e4 e6 2.d4 d5 3.c4 Diemer Duhm Gambit

1.e4 c6 2.d4 d5 3.c4 Diemer Duhm Gambit (Caro Kann Variation)

Against the Sicilian I could play:

1.e4 c5 2.d4 cxd4 3.f4 followed by c3 a Smith Morra Gambit/Gran Prix  Hybrid Attack.

1.e4 c5 2.d4 cxd4 3.c4 is also playable

   If Black plays 3...dxc3 then it transposes into the Smith Morra  
   Gambit . If not then White can play 4.Bd3  blockading the  
   pawn at d4 and White should be okay.

Best Regards
DarthMusashi

3...dx4 4.Nc3 e5 and black's game is very easy to play. I've never been impressed by the Diemer Dumb Gambit.

Apparently you have not play anyone who can play the DDG correctly.
My opponents usually get chrushed by my DDG Gambit. I take on
players over 2000+ in blitz and tournament games. Even some chess
engines get chrushed by my DDG. You really underestimate the DDG.

Best Regards
DarthMusashi