75 Spot vs. Paired Door Card

[electrical]

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I usually fold in this situation since my hand will be face-up if I call

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This I don't really agree with since I think he'll be more likely to fear rolled up trips or turned trip sixes based on how this game plays and how I'm perceived.

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Since you have small cards, there's only one way for you to win this hand at showdown, and making a two-pair or running trips may actually cost you money. If you do make the straight, you're probably only going to win the minimum, or lose an extra bet if he fills. With so little advantage in the money when you win, and a potential extra bet lost if you lose, this doesn't seem like a hand you want to show down.

If you think you can freak him out and make him fold (as implied by your comment), you could raise him back on Four and then semi-bluff Five or take the free card. The problem with raising for a free card is that it doesn't save you any money, since it's a double bet to you already, so you'd be raising to scare him, and probably still need to catch a scare card.

If you had anything else going for you, like a three-flush, you would have some deception built-into your hand, and you'd have more than one way to win at showdown. As it stands, if you're gong to play, I think you have to be aggressive enough to fold him (since you think he might fold), so you don't have to bank on your ship coming in eventually. If you make a straight, I suppose you could win that way too.

For myself, I fold Third and fold Fourth.