1st puzzle of 2018!

Happy New Year! This is the 1st puzzle of 2018!

It is white to move. Can you find the solution in 10 seconds or less?

Comments
No. 1-4
Cortex64
Cortex64

15 seconds. First sacrifice is blatant, but I didn't see at first the double arrival of the knights on d7. Blame it to New Year's eve.
Happy new year, especially to my old chess friend Yancey_Ward.

Alena
Alena

1.Qxa6+ bxa6
2.Ra7+ Kb8
3.Nfd7+ Nxd7
4.Nxd7#
It took me about 15 seconds to see the full line.

SusanPolgar
SusanPolgar

Editor

Happy New Year Yancey!

Yancey_Ward
Yancey_Ward

Editor

Took me less than 10 seconds to find the first move since white's king is so vulnerable if black gets a free move. About a 30-40 seconds for the full line.

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