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SGs are a generalization of MDPs to multiple agents. Like this previous question on MDPs, are there any interesting examples of zero-sum, discrete SGs—preferably with small state and action spaces? I'm hoping to use such examples as benchmarks, but couldn't find much in the literature. One example I can think of is a pursuit-evasion game on a graph.

user76284
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Some of the domains in the International Probabilistic Planning Competition, such as the Wildlife Preserve benchmark, fit quite well the constraints you have given. Note that the problems are modeled with a high-level declarative language, RDDL. This means that you can define problems as big or as small as your heart desires with relative ease, since you can parametrize state description in terms of functions describing properties of an arbitrary number of objects.

There's also a quite useful project that allows to instance OpenAI gym environments from the declarative description of the environment, states and actions.