I've long thought that after the critical 1 e4 c5 2 Nf3 d6 3 d4 cxd4 Nf6 5 Nc3 e6 6 g4 quite a decent sideline is 6...e5!?. The key line may well be 7 Bb5+ Bd7 8 Bxd7+ Qxd7 9 Nf5 h5 10 Bg5!? Nh7 11 Bh4:
Now 11...g6 forces White to sacrifice a piece for unclear compensation and could really do with several more tests, whereas 11...hxg4?! 12 Nd5 Nc6 13 h3! was a rather dangerous gambit in Shirov-Valerga.
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