Try the Grunfeld against d4 - its premise is piece activity. As white, if you want real mobility, play a gambit of some kind. I'm enjoying more and more the King's Gambit as white.
Openings Offering Mobility
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What got you interested in the French? Seems like you're almost intentionally defending a cramped position. Unless you're taking up dxe4 lines, in which case, go for it.
If I wanted wide open play on the black side, I'd think about a repertoire based around say the QGA and the Petroff.
On the white side, the Ruy sounds perfect for you. (Or failing that, the Italian with c3/d3, which amounts to about the same thing.) The French advance and Caro advance make a lot of sense. And the openings with a space-seizing f4 against the hypermodern stuff...the Austrian against the Pirc/Modern...the 4 Pawns against Alekhine's.
The only tough nut to crack would seem to be the Sicilian, as it's not easy to play for a space advantage in a line dedicated to wiping out your center. You might consider the Closed, which generally evolves into a kingside buildup and squeeze/attack. But a repertoire with classic Be2's and f4 when relevant might be objectively a little bit stronger.
Hi. I have experimented a lot recently with various openings, and I always play better and gain a positional advantage if I have an opening that offers mobility and fluid piece play. If I can gain an advantage in the opening, I feel I would win a lot more games.
Right now, against 1. e4 I play the French, and against 1. d4 I play 1. ... d5. With White, I play the Ruy Lopez, but I've tried experimenting with other openings, too.
I rarely lose a game where the opponent has a cramped position. Do any of you have any ideas?