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Puerto Rico is relatively complex for a Eurogame, and it cannot be summarized by a simple game concept. Still, its structure is not especially convoluted as the diagram below shows. While all of its mechanics may be harder to describe than for Amyitis, the entire system is conceptually more compact. Compare the diagram for Puerto Rico, below, with the one above for Amyitis. This diagram does simplify some things. There are ways of getting doubloons besides trading goods, and the various buildings can affect all of the game functions. However the basic engine is all there, and it makes for a pretty neat package. Puerto Rico's game concept may not be easily broken into its parts, but taken as a whole it is manageable. This seems to be the nature of most "engine" based games. Games such as Puerto Rico, Power Grid, Goa, and Settlers of Catan cannot readily be understood in terms of their component mechanisms nor summarized by a central mechanism that drives all others. The cogs of each mechanism are too tightly meshed. The game concept is the total effect. The challenge is to create a structure that is complex enough to satisfy the designer's ambitions, but simple enough to be comprehensible. Anyone who has taught Puerto Rico to a newbie knows that even the simple structure pictured above starts to push the limits of comprehensibility for most people. I think that this is the sort of structure that Cyril Damaegd had in mind when he spoke of a "line structure". Neither Power Grid nor Puerto Rico have structures which are simple lines, but both have a chain of causes and effects which takes place over several steps to yield victory points. Understanding the game requires understanding the chain.