Here is a variation I would like to try more.  Any ideas?

e4 e6 d4 d5 e5 c5 c3 Nc6 Nf3 Be7 Bd3 g5!?

Don't get it, after 7. h3 h5 8. Be3 the d4 pawn seems safe and black has weakened his kingside.  If the purpose of g5 is to attack on the kingside, then black's queenside pieces are going to have trouble getting into the fray.  Of course, I'm no expert, and some games involving this line would be interesting to see.

I'm sure I have seen ideas of playing g5 in other variations of the French but I don't think I have seen it in the advance. My main problem would be the knight on g8, how can it develop? In other variations where black has played Nf6 then went to d7 after e5 and then Be7 and g5 looks playable as the development is ok. I'm not too sure about Bd3, there may be better ways of playing, capturing on c5 is normally positional suicide but at some point in these lines it may be possible as recapturing with the bishop would be a waste of time and white may get away with it. This is just a first impression though, I'll have a closer look and see what I can come up with.

i really like the g5 idea.. i used to use it to scare Kings indian players ! .. my line goes. nf3 d6 g3 e5 d3 be7 bg2 c6 0-0 g5 !! and after whites normal nbd2 g4 puts whites possition in a mess. where black has huge attacking chances v.i.a h5 nh6 , f5 nd7-f8-g6 be6 qd7 and 0-0-0 ..

The knight should be able to enter the game via h6 to f5. And of course, ...h5 would secure against g4 attacking the knight.  I am still fresh into all of this ideas.  This is simply a fresh escape from the standard french ideas.  I have also seen Bb4 Winawer style, but this purposes a kingside attack immediately.  I have played it a couple of times and found some unique developing ideas, still working on it.  As far as castling, White can play Bd7 and Qc7 if necessary, and 0-0-0.  But I didn't worry about castling in my game that I am thinking about. My center pawn shield was sufficient.

I think it's too speculative, and unnecessary. Maybe it'll work in blitz, though.

Right then, I have had a proper look at this line now. First of all 5 Be7 is completely wrong strategically and goes against what the French is all about. The g8 knight clearly belongs on e7 then somewhere else and only then Be7. There is no tactical reasoning for this, by playing 5 Be7 you are not going to lose a pawn in the near future or anything like that it’s just like moving the same piece twice in the opening or putting a knight on the rim, you may get away with it but there are better ways of playing. The problem with Nh6-f5 is that white can then at some point play Bf5 favourably because of the pawn structure. Sometimes after ef5 it will be ok but usually not. Anyway after 5 Be7 Be2 looks like a safer way to get a fine game for white but I will stick to Bd3 g5. I think  0-0 looks fine for white, it can hardly be seen as “castling into it” as black will take a while for any mating threats and it gives white the e1 square for the knight where it can jump to c2. …g4 looks like the only way for black to justify his play, if anywhere in the next few moves black plays cd4 then after cd4 white can develop his knight to c3 and ideas of Nb5 will distract black from the kingside attack.  Ne1 now black can’t play to take on d4 because after Qg4 white will take control (Qg7 etc), f5 looks to weaken black’s king way too much so …h5 looks forced. After this white can play Nc2 and if black tries anything on the queenside white will just be better so he must try to get something going on the kingside ergo Nh6 then Bf4 looks really good, covering e5 and g3. Then h4 doesn’t look too convincing after Bh6 Rh6 Qxg4 and the attack looks defendable. Nf5 looks better when dc5 looks playable. Normally this would be positional suicide because white seems to forget what c3 was all about but I don’t think black can exploit it because he is attacking on the flank. Bc5 (black could ignore the pawn and just attack but I don’t think black has a good enough attack.) Now Nba3 looks good for white, planning to open the centre with c4 and possibly play b4 and Nb5, if black meets c4 with d4 it will be weak and eventually won and anything else looks to open the game up to white’s advantage.

Right so there are loads of different ways white can play and loads of different ways black can play but objectively it is worse than normal lines like 5 Bd7 or 5 Qb6, it’s a bit like playing Nc6 before c5 in the French, sometimes its fine but usually you will find yourself wanting to move the c pawn but it is blocked. So all in all I would say the line is tactically ok but strategically awful. 5 Be7 would almost certainly get a ?! dubious and possibly even a ? mistake.  

I'd like any line that led to positions like this...

The Gambit King

Check this one out for fun!  e4 e6 d4 g5!

Interesting, how do you intend to continue? In the normal french way with d5 quick to come or more of a Pirc type setup with Bg7?

It depends on what they play.  I aim really for a kingside pawn structure possibly, with h6, g5 f5 and e6, but that is all speculative.  At the least, I have a pawn to shove down their throat on the kingside, Bg7 is in the air, and maybe even Rg8.  It is off the wall! 

If I were playing it, I would play Bg7 and then see what White plays.  When I played it last time, I developed a strong kingside pawn chain with d6, f5 (he did not take), f4 and e5, and I won on that side of the board with an exchange sac that allowed me to checkmate on the backranks with a rook and an promoted pawn.

If you play d5 early, I think ...g5 was a waste of time.  I would hold back the center potential a bit (but that is just me, maybe you should try your idea and see if you like it, at least for blitz!).  You might learn a few new tricks that way.

Objectively I don't think it can be much good. However I will definitely experiment with it in Blitz and if I can come up with a way of playing that I am happy with I will even try it in normal time limits. I think I'd probably play Bg7 on the next move play h6 if need be or g4 if not. It wouldn't really be anything like a French though (that's why I queried whether d5 would come next, it wouldn't be a very good but it would be the only way to get the game French-like).

gambit king i really don't like that variation because you weaken both your king side and queen side with the king still in the middle

Yes, I wouldn't play it OTB, just in a blitz where you want to shift gears and have some fun.  I think even a 10-minute game would be fine, really.  But try it before you buy it! lol