Strategic math game

This time we are looking on the crossword clue for: Strategic math game.
it’s A 19 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: NIM.

Last seen on: –LA Times Crossword 16 Sep 20, Wednesday
The Washington Post Crossword – Sep 16 2020
The Washington Post Crossword – Jun 22 2019
LA Times Crossword 22 Jun 19, Saturday