I'm going to answer before I read the other replies.
It's a fixed-limit game, right? If you just call it down, your maximum cost, starting from where you're faced with the raise, will be 1+1+2+2=6 small bets, right?
Disregarding the rake, if you don't raise, the maximum CO can put in the pot is 2+1+2+2=7 small bets.
At the showdown, the amount in the pot will be .5+1+7+6=14.5 small bets.
Thus if you're paying a time charge to play, so that we can disregard the rake, in order to have favorable odds to call it down you need to win 6/14.5 = ~41.4% to break even.
Your starting hand against CO's range is almost surely at least that good.
In addition, you don't necessarily have to go to showdown. If the flop is
K
,Q
,J
or something else you really dislike, you can check/fold on the second betting round and your cost is only 1 small bet (or you might get a flop you want to bluff or semi-bluff).
So I think you should at least call.
And I'd call with all those other hands too.
I think you have at least 41.4% with all of them.
And then re-evaluate after the flop.
Plus I like defending the big blind.
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And if I play any of these, what's my general plan postflop HU?
How I would play after the flop would depend on the flop. There are lots of possibilities.
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Treat any flush draw like (almost) the nut draw?
No. Villain probably doesn't have a better flush draw, but he might. Thinking of your flush draw as the
nut flush draw would be over-playing your flush draw.
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Treat any board with an ace (almost) as though I have 32?
No.
In general, you need a better low than a flush. In other words, if you make a flush, your flush has a better chance of winning than your low, if you make a low.
Even with an ace on the flop (unless the flop also has a three and a four), you don't have the nut low. However, heads-up you have a decent chance to make the winning low with or without an ace on the flop.
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Or am I overadjusting to HU in a steal situation?
Playing your flush draw or low draw as a nut draw would be over-adjusting.
Now I'll go read the other replies.
Buzz