What is Atticus's strategy; in other words, his plan of defense in the Robinson case?I dont understand Atticus's plan in the Tom Robinson case. It...

If you are looking for this in Chapter 9, you are going to need to look at the end of the chapter where Atticus is talking to Uncle Jack.  He doesn't say a whole lot about the strategy, but he says a little.

First, Atticus says that it is a case of Tom Robinson's word against the Ewells' words.  He does not think he can win that way.  So we see his defense is to try to make the Ewells look like liars and to use Tom's words in his own defense.

He also says he intends to shake the jury up a bit, but we do not really know what he means by that.