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Can I get some help with this 'puzzle'?

According to the computer analysis of one of my games, this position was a mate in 6 (I lost the forced sequence).

But stockfish 8 made a different response than what was listed in the computer analysis.

Is it still a mate in 6? Or perhaps the different move created a more complex mate in fewer moves?

The given combination is:
11.O-O-O f5
12.Qxf5 e5
13.Rd8+ Kxd8
14.Qxf8+ Kd7
15.Rd1+ Ke6
16.Bg4#

However stockfish 8 responds with 12 ... Nd7, not e5.

Can someone tell me what's goin on? Thanks!

http://en.lichess.org/SGec2zvp2W5M
Ok so I spent an entire hour trying to find the answer and immediately after I posted this, I take another look and find the solution immediately.

It was the case where Nd7 equally created a mate in 6. Not a bad puzzle though :D I'll keep the answer so you all can at least make some fun use of this now worthless thread.

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