[Guernica4000]

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So my questions are:
1) Do you agree that most of the profit in limit holdem comes from marginal hands?
2) Do you agree that it is actually a bad preflop strategy in limit holdem to play too tightly preflop, because if you don't play enough marginal hands it will be difficult to make a profit?

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1) Do you agree that most of the profit in limit holdem comes from marginal hands?

No I do not agree, and my stats on PT support the fact that I make most of my profit on good hands.

2) Do you agree that it is actually a bad preflop strategy in limit holdem to play too tightly preflop, because if you don't play enough marginal hands it will be difficult to make a profit?

I think the key here is position and table structure when discussing the term "Marginal Hands" I think you would agree that A9 on the button against the blinds is a pretty good hand and it will show a profit over time but the same A9 in a raised and called pot or in first position will break you in the long run.