Let's try our hand at a two-point problem. Here is the original
record of the northwest corner of Section 17. We should immediately
recognize that if the northwest corner is lost, and the other two
are identified we have a two-point control restoration problem.
Restoring this lost corner by two-point control would be similar
to occupying each of the two control corners and measuring out the
record distance from each.
Unfortunately, it's not quite that simple in most cases. The situation
shown here, where record lines run in cardinal directions, do not
intersect is typical of many cases involving two-point control.