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Continue to ChatWin at Nim! The secret mathematical strategy for kids (with challange problems in transfinite Nim for the rest of us) https://jdh.hamkins.org/win-at-nim-the-secret-mathematical-strategy/
Win at Nim! The secret mathematical strategy for kids (with challange problems in transfinite Nim for the rest of us) https://jdh.hamkins.org/win-at-nim-the-secret-mathematical-strategy/