Beginner Exercise 105 / Solution

 

White tries to keep Black separated, since otherwise the purpose of the original moves is defeated...

 

... but now White is caught in a ladder.

White backs down  

chtito: So I guess that White should answer like this instead.

The final result is not so bad for White, is it?

Bill: It's grim, Jim. Look at how many moves White has wasted.

and are thick, but lose sente. Here is a thought:

Sacrifice  

This is still good for Black (although - is questionable). Is it worth it for White just to save a few stones?