I was looking at the Hyperaccelerated Dragon, and found that after 1. e4 c5 2. Nf3 g6 3. c3 Bg7 4. d4 cxd4 5. cxd4 d5 6. e5 Bg4 (see study), the most common continuation in the master's database is 7. Bb5+ Nc6 8. Bxc6+. This surprised me, because white gives us the bishop pair, and his good bishop (given that white's pawns in the center are on dark squares). The engine, however, agrees that this line is best. Does anyone know the theoretical justification for this exchange? Why should this be preferred to something like 7. Be2?
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