Can someone suggest books that go over invasion variations in particular how to invade a komuku jump with a 3 space low extension along the side or a 2 space extension for that matter rather than books that just show the best invading point.

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Only 'Encolsure Josekis' comes to mind, but I haven't read it yet.

http://senseis.xmp.net/?EnclosureJosekisTheBook

Its probably also in many of the Attacking-Books.

Get Strong at Go Series, Vol. 5 - Get Strong at Invading.

Attack and Defense has some general ideas for invading various 3 space extensions and what to expect from them, but joseki surrounding them are much more mutable than traditional corner joseki because the surrounding stones tend to be closer and affect the situation more.

Fundamental Principles of Go has variations given for ten common formations around the corner; included is komuku with low two space extension but not a three space.

As skydyr mentioned, Attack and Defense covers three space extensions in general (as does Fund. Principles) and (Attack and Defense) specifically covers the komuku/three space low invasion- but this is a very brief coverage, less than a page.

Can anyone give some input on the suggest strength for Get Strong at Invading? I'm finding that although I enjoy reading books about strategy, problems seem to be the crucial factor in me improving at this stage- and are easier to fit a few in here and there throughout my day.

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