The Scandinavian! I find this to be a really nice weapon for this reason. You pretty much get the opening/setup you want in 90% of cases. The downside is you must play accurately in the critical lines or you will get crushed. But if you watch for g4, the early d5 break and sacrifices on h6 and e6 (and study how to defend against those) it usually results in a pretty comfortable game and a slightly better end game; at least in my limited experience. Also, I've noticed a lot of players hate to face it so that's a nice plus as well. 
What systems can black use for most or all games?
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Jan 14, 2018
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There are at least three set-ups Black can play against virtually any White set-up: The KID / Pirc (ie, Kingside Fianchetto), the Hippo (ie, double fianchetto with pawns on d6 and e6) and the Philidor / Old Indian (strongpoint on e5).
All three have the same general theme: keep the pieces back, keep most of the pawns back and try to set-up a solid position with potential for counter-attack in a closed position. The Hippo may not be sound with certain move orders, but the others most definitely are, and they can all be good blitz openings.
I v been playing the London system against almost any response by black. Is there any black opening system that can work(playable) against any white opening?