Fig. 6: Success probabilities of COMBO when executed for the same number of cycles as QTG in comparison with those obtained by QTG.

The subfigures (from left to right) show the measured average success probability for different groups g = 2, 3 ≤ g ≤ 6 and 7 ≤ g ≤ 10, respectively. Due to the nature of COMBO, it either produces an optimal solution or fails to find any solution. The results show that when both methods are executed with a timeout, QTG-based search is able to compete with COMBO when comes to finding optimal solutions for instances with 7≤g≤10 with a high success probability.