It is now more that 1 1/2 year since TJ introduced his interesting 1.Nf3 f5 2.d3 Nc6!? 3.d4 e6 idea....

So far noone has let me try this variation with black...

After a quick database search, it seams there have not been any other games than Roiz-Wojtaszek....
Theory sometimes moves slooowly (- which is not a bad thing actually)

Anyone got any experiance with it?

Formally speaking you are right of course. But the Leningrad, the Stonewall and the Iljin-Zjenevsky have the character of an opening system (like the KI). They can be employed against various White setups.
The goal of the Iljin-Zjenevsky for instance is basically to get the pair of centrepawns e5/f5.
So the title of this thread, Dutch versus 1.Nf3, is correct. The question here is, if White succesfully can avoid the transposition to the normal Dutch, while Black still plays a Dutch strategy. In my opinion the answer is no.
At the other hand the positional differences in Black's play between 1.e4 c5 and 1.e3 c5 are big.

I suppose for White 7.Nc3 is a light improvement, while Black can play 6...Bxd2+ immediately. Compared to the Iljin-Zjenevsky the bishops of the black squares are exchanged. This benefits Black, as it will be easier to force e6-e5. Black's extra move Nc6 fits in this plan.
So again 6.Nbd2 must be critical, White playing for the pair of bishops (Bxd2 Qxd2 and Bb2). But even here Black's extra move Nc6 might help him.

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I am ready to defend its honour! 

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I did.  And you make a good point:  If "Carlsen play doesn't work", what happens if White goes back to main line ideas?  Are the Q and QN misplaced after 1.Nf3 f5 2.d3 Nc6 3.d4 e6 4.c4 Qe7 5.Nc3 planning g3, Bg2, O-O and a standard Anti Iljin-Zhenevsky plan (e2-e4 or d4-d5 or b2-b4?  If thses main line tests are passed too, our problems are mostly theoretical, and that's just chess.

@ TalJechin
"Well, I removed it since it seemed like no one was interested "

Off course we are interested!  Black seems to need some new ideas in this variation... However your proposed setup is really something new

@ yzfool
I guess you meant 5...d6 in your variation (not e6...).
However I dont think black has any problems: 6.Nc3 Qe7!? (instead of Be7) with the same idea as originally proposed by TalJechin e.g. 7.d5 Nd8...


some comments:
Other fourth move alternatives:
The direct 4.d5 should not be a problem for black 4..exd5 5.Qxd5 g6 with Nf6 Bg7... 

With the "standard" dutch 4.g3 I guess black could play in the same way: Nf6 5.Bg2 d6 (or Qe7!?) 6.c4 Qe7!?

But as you mention 4.c4 look critical: Qe7!? 5.d5 Nd8
if 6.dxe6 black should be OK after Nxe6
but what about 6.Nc3...?
At least I think Black should be careful not to rush e6-e5 pawnpush. After 6.-,e5 7.e4! looks good for white. White gets good control of that e4-square.... and 7.-,g6? 8.Bg5!

Better is 6.-,Nf6 7.Qc2 (g6 or d6). Can White break early in the center? (and does it lead to anything...)Or else something like 8.g3 Bg7 9.Bg2 0-0 10.0-0 e5 should be OK for black....

Maybe white should not rush the d4-d5 advance? Like:5.Nc3 Nf6 6.Qc2... d4-d5 would still lie in the air, white may break in the center or wait for e6-e5 and play d5 and e4.... Here 6.Qc2 b6!? may be possible....

It is hard to tell what is whites best plan... To me it seams Black may be OK. Even if it is hard to beleave that this Qe7 move can bee good... (Well, the "modest" 2.d3 doesnt look that impressive at first sight either...) But as a Leningrad-player, nothing would please me more 

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I see two problems: 1) if you want a Lenningrad type position, or 2) if White plays 4.Bf4 hitting the only target in the position and doesn't allow Bf8-b4 via K-side development: e.g, 4.Bf4 Nf6 5.e3.  What does Black do with the KB?  5...e6 6.Nc3 Be7 7.d5! looks much better for White.  So, if White bides his time in your formation with K-side development after 4.Bf4, how do you avoid this Nc3-d5 plan? Perhaps an "ugly Stonewall (if White plays Nc3 you play ...d5?  Well, maybe, as White's QN is as badly placed as our QN).

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I play the "Franco Dutch" 1.Nf3 e6 planning 2...f5 and simply accept the fact that I will never get to play the thematic ...Ne4 after 2.c4(!) followed by d3 [the only time a 1.Nf3 player should play e2-e4 is against the Dutch! ].

Since 1.Nf3 is a major opening, and makes 1...f5 dubious, it appears Black will have to let his Dutch defense preference determine his defense to 1.e4.

That is the real problem the 1.Nf3 causes.  Not for you or I perhaps, but for those who want something other than a Pirc or French just to play the Dutch.