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Correct second move is 8th option

http://en.lichess.org/training/9202
About second white move:
Deep Rybka 4 says: First option: mate in 5 starting with Rf7 (I saw it, and it was considered wrong. So I open an engine to see why).
2nd option: Mate in 8 starting with Qxa6
3rd option: Qd3, advantage +15
4th option: Qe2, advantage +9
And so on.... But puzzle generator chose instead a move that gives a +5 advantage and lets black get back a pawn, with some struggle left. Why????

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