I'm not paying for an invitation, madame.
When to play ...f6 in the French Defense??

Thank you guys for helping me.
@SaintGermain, Thank you for showing the games.In Tarassch lines ...f6 is a book moe as you showed. What about the Classical variation with 3. Nc3 Nf6 4. Bg5 Be7 5.e5 Nfd7 6. Bxe7 Qxe7. When should black play ...f6 here?
@abhi, I prefer the line with Nf6 against the Tarrasch rather than c5 because it leads to similar structures, while c5 leads to an IQP sometimes which is not to my taste. Nevertheless, the line you showed is interesting.
@twomove, thanks for the sugesstion. Are you meaning "Playing the French " by Nitrilis and Aagaard ? Isnt t a bit too theoretical for my level? Isnt it a Grandmaster Repertoire book by Quality Chess? Also Im looking for a book with illustrative games rather than a tree approach ( sort of like the Uhlmann book ).

MacCutcheon/Chigorin Variation - the Soviets including Alekhine and me were always playing with its minor pieces a lot. Not that I'm one of them. Anyways, if playing c5 then Qd5 makes sense. Active piece play.

Playing the French isn't as complicated as the GM Rep series of books, but not beginner level either. As quite a number of illustrative games amongst the theory.

@SaintGermain, Macutchon and Winawer are too sharp for me. I want to try the more solid and closed lines without the Bb4 move.
@twomove, okay then I will check it out. Thanks.

Okay so this is what I could deduce from examining some french games.
1. In the Tarrasch variation , ...f6 is a book move.
2. In positions where white has a bishop on d3 and has a queen which is able to go to Qh5, ...f6 will be a blunder unless the king has the oppurtunity to move to the d8 square when checked.
3. ...f6 is a mistake when we have a knight on d7 making the e6 pawn weak and subject to an attack by white with Nd4.
Anything else to add?
I know that ...c5 and ...f6 breaks are how black tries to undermine white's space gaining pawn structure in the centre. The ...c5 break comes naturally to me, but ...f6 is the problem. Could anyone give me a guideline or rule of thumb as to when ...f6 should be played? ( Note : I play the classical lines with Nf6 and not the Winawer).
When to play ...f6 or f5 in the French. I am tired tonight. Tomorrow I will post what I hope will be helpful guidelines and rules of thumb of when to play ...f6, or ...f5

I'm not an expert in the french or anything, but just play it when it seems logical (you need to break up white's center or else you have nothing to do) and it doesn't lose or drop something.

Here's a part-finished game I played against Stockfish - I played ...f6, which is a decent move, because there's no way else to activate my pieces.
https://www.chess.com/daily/game/159667532

Here's a part-finished game I played against Stockfish - I played ...f6, which is a decent move, because there's no way else to activate my pieces.
https://www.chess.com/daily/game/159667532
Your opponent admitted to using Stockfish?
master its my prob
mt speed is prob
can u try to view my games showcase blogs