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6.h4: the sacrifice on h5
After 4.d5 Bxc3+ 5.bxc3 d6, White sometimes pushes the h-pawn: 6.h4 arises in 13 games, for 54%. When White sacrifices the rook on h5, GMHess takes everything on offer.
Recall: after 7.Bd3, which move does Stockfish prefer?