protection of phase 11

These final adjustments leave a self-consistent mixture of counter arrays and glider guns, inasmuch as the guns are protected from the gliders which they generate, or which can reach them across a field of bistable cells. Eighteen transitions remain to be assigned, which can be used for complications not yet foreseen, such as closely spaced glider guns or a barrage of gliders denser than can be fired from the guns. A complete solution to this problem in neither necessarily possible not unique should it exist; searching for one would be an interesting exercise.

Harold V. McIntosh