The Coevolution₂ rule has a performance of 86.0% and was also discovered using a coevolutionary approach between GA-evolved rules and ICs [8].

The solution to the Coevolution₂ rule was easier to find than the solution to the previous rule. For this problem, populations of 50 individuals with chromosomes composed of 9 genes of length 22 each were used. The sub-ETs were linked also by the IF function.

In one run, an intermediate solution with fitness 126 was found by generation 18660. This program was used as seed to initialize another evolutionary epoch. After 23807 generations the following solution was found:

which is a perfect solution to the Coevolution₂ rule. The sub-ETs encoded by each gene are linked 3-by-3 with IF, forming three big clusters that are, in their turn, linked also 3-by-3 with IF.