Here is another hand for discussion. Again, the goal is not to get the right answer, but to think about some interesting situations. Please feel free to post some ideas even if you might change your mind later.
Medium stakes 50-30-20 SNG bubble, blinds 200/400
CO (unknown): 4960
BTN (good reg): 4200
SB (bad casual player, unknown bubble tendencies): 540, 340 after posting
BB (good reg): 3800
CO folds, BTN pushes 4200, SB folds, BB calls 3400.
1) How much equity does the BB need against the BTN's range?
2) If the SB had called, how much should the BB overcall?
3) How often should the SB call?
4) How widely should the BTN push?
5) What is the correct calling range for the BB?
The analysis of this hand surprised me, and my range from the BTN would have been far off the Nash range. The players in this hand also might have been confused.