Call all-in pre flop with 77?

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Yeah I agree w/ Bobby. Definitely need to know stack sizes compared to blinds.

and also need to know about your opponent. Has he been going all-in a lot? With less than premium hands or only really good ones? How long have you been heads up?

There are several things about this hand that you need to consider that it sounds like you don't normally think about.

As an aside from this hand: Try reading pgs. 16-23 in Harrington on Hold'em Vol. 1. I think your overall game would improve some from that.