Calculating one move further

I have just come across this nice game played by my friend GM Nick Pert last December.

I think that I would have played 1 N4a5 which is good enough for some advantage. In my calculation, I looked at the move Nick played, and which caused black's instant resignation, but stopped calculation a move too early: I should had been more determined, 1 Nd6 being the move your 'hand wants to play' but I thought after the capture, and simplifications on c5, I thought black would be free, but the lethal d7! shows that the Rc8 is overloaded- in CJS Purdy language, I should have been able to spot it by identifying the Rc8 has been tied.

As Purdy writes:

Some things are hooey,

and most others lies;

But forks you mustn't miss,

nor pins, nets, ties.

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