is the point. Although and are miai, dominates, for reasons that will become apparent.
and are miai. Now is the key to getting tedomari.
Next Black takes his sente with - .
gets tedomari, just barely. If White responds on the top side before then, Black can make a play in the bottom left corner and get jigo.
If White had played at in the previous diagram, Black could have responded in the bottom left corner and gotten tedomari.
Now Black and White share the final miai.
White wins by 1.
The point of this problem is not widely known. In fact, taking the three stones in the top left dominates for Black, as well. The book said that was worth slightly less than . It even suggested counting it as 1/2 point less. That goes too far, OC, but in 1980 nobody understood go infinitesimals.
For more about the comparison of miai in this problem, see /Difference Games.
-- Bill Spight
Since the top side is settled, Black can take his sente with - and then get tedomari with .
Black takes his sente with - and then gets tedomari with .