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6…h5: the line that slows you down
Against 6.Rg1, one black move costs you more than the others: 6…h5, before even …e5. 31 games, 44%. And after 7.h3 g6, your usual push 8.g4 scores only 29%.
Recall: after 6…e5 7.Nb3 h5, why 8.h3?