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.