Puzzle 26.05.16
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White has a different first move somewhat better than the one in the given solution. The given solution only seems to win quickly because it fails to analyze 4...Qd4+.
I let Fritz 15 work on the solution given by the OP. My conclusion is that with Black's best defense, including 4...Qd4+, White can force mate in 29.
With the alternate first move I alluded to, White can force mate in 15. So, can you find the faster win?