I've looked into the code more and added more logging, etc. The pengine essentially walks the list of constraints, applying weights, and then walks the list of resources and tallies the weights. In my example, it ends up walking the resources backward, i.e. it assigns a node to Y and then assigns a node to X. Unfortunately, at the time of assigning a node to Y, X has no assigned node and so the colocation rule cannot be applied. What is needed is a backtracking method from the computer science area of "constraint satisfaction". Alan
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