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The puzzle sucks since 2.Rd8: is by principle the better move (2. ... Qd8: 3. Qg5: of course). Exchanging material is the way to go with a bishop ahead, to minimize chances for a counter attack.
I noticed that too but just assumed the puzzle line threatened to capture the knight in addition to the bishop while the 2. Rxd8+ Qxd8 line leaves the knight defended.
dumbest puzzle in quite a while!
What's dumb about it?