o AZ-PUCT. However, in its algorithmic form it only allows backpropagation of value while AZ-PUCT alone would have made the same choice of move, up to a small delta, and breaks the chain when this stops being the case. This allows wider exploration without damaging the upper search tree, while still accurately calculating value in previously neglected sub-trees and allowing unexpectedly good moves to be propped up and exploited by AZ-PUCT (see Figure 9). Elimination is used as in H-MCTS to avoid wasting too