This sort of thing is pretty standard for anyone familiar with SNG play and a program has been developed to analyze this exact type of situation (when to push or call all-ins based on stacksize). Do a search for Eastbay's SNG Power tools (
Available Here ) if you are interested.
As for your questions if someone is literally pushing with any 2 and a 10BB stack you should be calling with something on the order of your top 66% of hands or 22+,A2+,K2+,Q2+,J3o+,J2s+,T6o+,T3s+,97o+,95s+,87o, 86s+,76s
This is a 0 EV situation. In practice you probably want to have some sort of edge so the following list is proably more accurate: 22+,A2+,K2+,Q5o+,Q2s+,J8o+,J6s+,T9o,T7s+,98s (Top 49%)
(The bottom of this range is worth a little over 1BB)
For 15BB Stacks:
0EV - 22+,A2+,K2+,Q2+,J5o+,J2s+,T7o+,T5s+,98o,96s+,87s (60%)
+EV (> 1BB) - 22+,A2+,K2+,Q6o+,Q2s+,J8o+,J6s+,T9o,T7s+,98s (48%)
Of course if the player isn't actually pushing every hand these ranges change dramatically. If instead he only pushes the top 50% of hands. We see the following results:
10BB Stacks:
0EV- 22+,A2+,K7o+,K3s+,QTo+,Q8s+,JTs (32%)
+EV - 44+,A4o+,A2s+,KTo+,K9s+,QJs (22%)
15BB Stacks (about the same as above):
0EV - 22+,A2+,K8o+,K5s+,QTo+,Q9s+ (30%)
+EV - 44+,A4o+,A2s+,KTo+,K9s+,QJs (22%)