black can live by playing at 6
white kills by playing at 1
Again, it depends. What i think is that B lives or is in seki if it begins
Dieter: indeed kills in a fancy way. If at a, at b. at is the easier way to kill, to the extent that here would never occur to me.
unkx80: I think at , then at , and the result is ko.
Dieter: Time for the teacher's just to see if everybody was paying attention tesuji?.
unkx80: This problem looks like my two problems ( http://www.goproblems.com/prob.php3?id=3052 and http://www.goproblems.com/prob.php3?id=3053) on goproblems.com, but harder. =P