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📄 nim -- from wolfram mathworld.htm

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<META content="Weisstein, Eric W." name=DC.Creator>
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content="A game, also called tactix, which is played by the following rules. Given one or more piles (nim-heaps), players alternate by taking all or some of the counters in a single heap. The player taking the last counter or stack of counters is the winner. Nim-like games are also called take-away games and disjunctive games. If optimal strategies are used, the winner can be determined from any intermediate position by its associated nim-value. The nim-heap illustrated above corresponds to the game..." 
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