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Try to stay away from all in pots against an opponent you can outplay. You should only play a huge pot with an opponent in two cases:

1. He is equal or better than you in skill level

2. You have a very strong hand. And I mean very strong.

Indy

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When the blinds are 300/600? If this is an 800 chip SnG, then we've got a stack of 4k or ~6.5BB. The way to win here is to push very frequently on the button and to call pushes with marginal hands against an opponent who's pushing frequently. If your opponent is dumb enough to play tightly here, then you can fold confidently to pushes without a great hand so that you can grind them down to nothing, but otherwise, you should be looking for small edges.