I've been thinking about when a SnG goes HU. Often, there will be a 3:1 or more chip difference so I pokerstoved what calling ranges to use to finish off the short stack.

Assuming shortie is shoving 50% of hands preflop:
50% equity or better = QTs+,K9o+,K8s+,A3o+,Axs,33+
55% equity or better = KQo,KTs+,A8o+,A7s+,66+
60% equity or better = AJo+,ATs+,88+

I love pokerstove. My conclusions from this are if you're the short stack HU, shove pre and shove wide. If you're the biggie, the more of a chip lead you have, the more patient you can be.

I have a lot to learn.