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Suppose going from c4 to c5 and both legs mandatory. Pathways are c4-c6-c5, c4-d5-c5, c4-d4-c5, c4-c3-c5, c4-b4-c5, c4-d5-c5, six-way. If both legs mandatory, then all six ways have significance. For all the different squares reachable, both mandatory and darter maximize the significance of multiple pathways, I think.