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In page Strategy game:

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A purist's definition of an abstract strategy game requires that it cannot have random elements or hidden information. This definition includes such games as chess and Go. However, many games are commonly classed as abstract strategy games which do not meet these criteria: games such as backgammon, Octiles, Can't Stop, Sequence and Mentalis have all been described as "abstract strategy" games despite having a chance element.[citation needed] A smaller category of non-perfect abstract strategy games incorporate hidden information without using any random elements; for example, Stratego.