It's a good idea, but I don't think it fixes the problem I'm trying to prevent. I see a lot of the beginners make small extensions, and I don't think that it always correct. I'm trying to find an example to show why a larger extension can be better.

I like your thinking, though. I like the b that takes the corner (and then puts White's stones into motion) better than just jumping. I think it might be an "inducing" move.

This came up because my opponent played the following sequence:

From the game  

He figured that he could later trade black a for white b.

I'm trying to illustrate this without going into the order of moves, or anything else.

I would think that the beginner (and I used to) think that the first diagram, with more stones, would be better, since the territory was more secure. I am trying to show that "more is not always better."

However, if there is an invasion point in my diagram, then the comparison of the two diagrams really falls apart.

What do you think?