Middle Game Exercise 3

Pro game position at move 117 (last move marked)  

I have added a new diagram after the pro move in middle game exercise 2. The "finishing a pro game" idea seem very interesting to me, so do we continue with the next white move? Klaus

Assuming that it might be at a (as suggested below), we should try to find an acceptable plan for black so rescue his two stones in the lower left. At least, we might find a way to use the aji. Maybe the last black move might be useful for that too.

Note: the "finishing a pro game" idea never materialized at SL. Therefore, I have split it up into 3 pages: middle game exercise 1, middle game exercise 2 and middle game exercise 3 -- Dieter