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In the diagram above, is usually not sente, simply because White does not need to answer at all. It also seems that White can answer it in sente:
But Black can play better:
Later, White will probably get this exchange in sente. But this is still a gain for Black. See Value of a monkey jump for a detailed discussion.
If the marked stone is one line higher, as in this diagram, Black can keep sente with this simpler (and better) line, as White needs to defend the cutting point at a.
Any of a, b, c, d, e may be right depending on whether White has stones on the circled points. a and b are often best if they can be played.
One time I remember seeing something about using the monkey jump to connect two groups. I tried it in a game and I couldn't get it to work and now I can't find the page which talks about how to do it.
Herman Hiddema: It usually only works if the stones on the second line that you are connecting are 3 points apart. So the move should be a monkey jump from the stone on one side, and a kosumi from the stone on the other side. It may work in other cases, eg if it is a one-point jump from another stone on the first line. See also: Monkey Jump Connection.