1...e6 for 1.e4 and 1.d4

If you play 1...e6 vs  1.d4 and 1.e4   what do you play against :

1.c4  and  1.Nf3 ?

?

yo la juego french and stonwall

Gambit published a book by Viacheslav Eingorn in 2012 titled "A Rock-Solid Chess Opening Repertoire for Black", that deals with a Black opening repertoire based on 1.e4 - e6 and 1. d4 - e6.

1.e4 - e6 Off course leads to the French defence, where I would recommend both "Chess Explained - The French" (Gambit, 2008; V. Eingorn & V. Bogdanov) and "The modern French" (New In Chess, 2012; D. Antic & B. Maksimovic).

1.d4 - e6 Will likely transpose to Nimzo-, or Bogo-Indian, without having commited the king's knight to f6. 

I konw a chessplayer that ALWAYS (at least against me) playes 1.e6 2.c5!

e4-e6, d4-c5

d4-e6, c4 or e4, c5

Nf3-e6, g3-c5

And so on..

The opening can transpose into a Benoni position (d4-Nf6, c4-c5, d5-e6) and sometimes the Sicsilian Paulsen (e4-c5, Nf3-e6, d4-cx, Nx-a6)

And with white he plays the London system. Pretty good chess player! (Though he dosen't play many openings )

It can be a bastard against 1.Nc3,e6 2.Nf3,d5 because white is basically forced into mainline territory.  3.e4,d4 4.Ne2,d3!? 5.Nf4 is pretty interesting and unusual. 

I love 1...e6, but for a completely different reason. For me, it's a tricky  transpositional tool. It's kind of like 1. c4 for the black player.

It's so diverse, you can use it to suss out what kind of game your opponent wants then go for something different. Do they play e4 and d4 looking for a French? Then play c5 and get a Sicilian instead! You may well have avoided some annoying Closed Sicilian lines. Do they play c4? Then again you have many choices - Semi Slav, QGD, Triangle System, Nimzo/Bogo...

I don't play 1...e6 to avoid theory as much as to reach my favourite lines through a different order, giving the opponent the chance to make sub-standard moves on the way. In this regard I consider it a fantastic practical try for black. Often after c5 you end up in Alapin Sicilian or Benoni territory, but good lines for black. But just occasionally white will push too hard and you will get something like this: 1. e4 e6 2. d4 c5 3. c3 Nf6 4. e5 Nd5 5. c4 Nc7 6. d5 d6 where white's centre is collapsing and black has totally equalised.