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Puzzle failed...

http://en.lichess.org/training/18876

The objective in this puzzle was to win the knight and so I played 1. Qg3+ Kh1 and then Qxg5 and got a fail for it because I didn't play 2. Qh4+ first I saw that move but I just don't see how this is much better for black which is why I played Qxg5 immediately, even if Qh4+ is marginally better I don't think it should count as a fail. At least it should say ''good move but you can do better''. Am I missing something because I don't think a ''fail'' was justified.
common now...
This puzzle has the right solution. With your choice, you give the possibility to black to have an "air". With the right solution, you win the knight and continuous giving check.
It is better to take that piece with + though on principle alone. You're winning a tempo. After Rg1 white is winning a tempo on you. But you're right, it's not counting for much extra in the end. Also in the delayed check line black keeps pressure on f2. Not a big deal but it hinders white's development even more.

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