After 5...Bg4 6.h3, the pin-keeping 6...Qh5? drops the bishop to 7.hxg4, and after 6...Bh5 7.g4 the natural-looking 7...Nxg4?? sacrifice is unsound: 8.hxg4 Bxg4 leaves Black a piece down for two pawns. 7...Bg6 is the move, and even then 8.Ne5 followed by 9.Nc4 can hunt the queen down.
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