A very important point about jumping out when pincered, that I've not seen mentioned here, is that after white responds to help the corner stone, you
must have a good move to play next. In the case of the one space low pincer, this is the shoulder hit press previously mentioned, as it presses white low and, very importantly, has a fairly decent connection back to the jump stone. I only say fairly decent as there is a cut at
a which can get complicated (there are ladders involved and in fact this cut can be a strong move), but at least we can see that

and

are reasonably close together here.
$$Bc One space low pincer jump and press - ok
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- Click Here To Show Diagram Code
[go]$$Bc One space low pincer jump and press - ok
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But now what happens if white plays the two space low pincer? Jump out now is not a joseki move and is likely bad, as after white helps the corner black has no good move: the same idea of shoulder hit press is too far away and weakly connected to the jump stone so is easily separated.
$$Bc Two space low pincer jump and press - bad
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- Click Here To Show Diagram Code
[go]$$Bc Two space low pincer jump and press - bad
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$$ ---------------------------------------[/go]
Same thing happens with three space low pincer. This is a general principle of looser pincers: they put less pressure on the approach stone as they are further away, but also by being further away they are less susceptible to counter attacks after the approach stone jumps out.
To add to the confusion (or not if you think about it carefully in terms of "after I jump out and he answer do I have a good move?), if white plays the two space
high pincer, then jump out becomes a joseki move again because we can slide underneath it to make a base, which we can't with a 3rd line stone (N.B. to preempt the pedants these days this is often considered old joseki and good for white as black is low, also in terms of whole board thinking I don't really like this much for black).
$$Bc Two space high pincer jump and press - ok
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- Click Here To Show Diagram Code
[go]$$Bc Two space high pincer jump and press - ok
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