Well, let me try to be helpful.
A “normal” table is a table with normal players and a normal number of players. A standard situation. KJ can be a lot more valuable at a variety of non-standard tables. For example:
At a table where people constantly overbet hands, any hand that can make a straight goes up in value.
But in general, KJ is a tough hand to play because no matter what you hit you can’t be sure where you stand. If you hit a K someone could easily have AK or KQ. Really hitting a jack is better in this situation, because then you are only outkicked by AJ.
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As far as not being able to fold certain hands, I think a lot of starting players make this mistake: They value hands based solely on hand rarity, without taking into account betting patterns, the texture of the board, etc.
What I mean is, if a guy hits a flush, he says to himself “wow, a flush is rare, I must have a great hand” even if he has a very low flush and someone is re-raising him.
You have to look at your hand in the context of what is on the board and how the players are betting now and have bet in the past. As a general rule, if you are new to the table and don’t have a good read on people it’s best to respect their bets.
You can’t get into the habit of saying “well, come on, what are the chances he really has a 5 to complete that inside straight?” If he is betting hard, the chances are probably pretty good!
You have to look at the board and ask yourself what could he be re-raising on. If there is 1 card away from a straight and he re-raised you, he probably has the straight and he may very well have the 2 cards to give him a high straight.
The value of a hand isn’t just what you have. It’s what they have, and while you don’t know what that is, you can learn a lot by watching them play and remembering exactly how the hand has played out.
I find that most players fall into pretty predictable categories and watching someone play just a couple of hands I can get a pretty good idea of their overall playing style.