One move a day

I stick to 6.cxd as white's best move, before trying anything else. But my guess is that he might play Be2, avoiding Qe7+ and preparing castling. 6.d4? still runs on Bb4+.

6. cxd

I haven't analysed it properly, but 6.Nc3 seems consistent with White's plan of pressure on the d5 square.

Makes sense too.

1. c4 e6 2. e4 d5 3. exd5 exd5 4. Nf3 Nf6 5. Qb3 Nc6
6. cxd5

At last. But black still has some advantage.
6. ... Nxd5 would be my move. Or will he go for Qxd?

Nxd

I find a couple of points interesting:

- White is playing a very aggressive game. I wonder what the time controls are?

- Everytime, someone has picked black's move, whereas white continues to stump us almost everytime (Well, Memphisto2 sort of called cxd before)

Memphisto2, you have the highest rating here. Do you agree with RahimK? Even though I'm a lower-rated player, I can't say I agree with him. Even though whites moves are unorthodox, they don't appear to clearly break any opening principles, and 5.Qb5?! is the only move that has me scratching my head a little. However, if every move made sense to me all the time, I'd never lose.

As for my pick. I'm going to pick 6...Qxd5.

If black plays 6...Nxd5, and white responds 7. Bc4, will black be forced to gambit the f7 pawn or give up a tempo?

I do think that Rahim's conclusion is premature, at least for black. So far I can't see which of black's moves would be called 'weak' justifying a classification of a 1200-ish player. White made a few odd moves which one wouldn't expect from a higher rated player, but then again, we don't know why. It could be a training game (teaching black how to exploit weak openings for instance).

6. ... Nxd5 7.Bc4 could be answered by Qe7+, forcing black to give up castling or make a tempo losing move with the bishop (and be even in more trouble). Having said that, a similar continuation is possible after 6. ... Qxd5 7.Bc4 Qe4+. The two black choices look to me as a matter of preference and style.

I like 6...Nxd5, simply because I feel it is way too early to offer a trade of queens. Black already can boast a better position, and probably feels that he can continue to outplay this opponent, so why allow a queen trade which reduces the potential for tactics?

1. c4 e6 2. e4 d5 3. exd5 exd5 4. Nf3 Nf6 5. Qb3 Nc6
6. cxd5 Nxd5

7. d4 has my vote here

We already discussed 7.Bc4 Qe7+.
After 7.d4 Bb4 is still winning a development tempo.
7.Bb5 Qe7+ ruins the castling.

Therefor, the most obvious move, which would be my choice, is
7.Nc3. The bishop on f1 can still develop later and/or block the check on e2. Black maintains advantage, however.

I would play 7.Nc3. Any other plausible-looking development move only worsens White's game.

That's the problem of these anti-French systems.