Nim Two Three
(page 48)

Here's a solution from Mrs. Wood's 1st hour 7th grade math class at Valley Heights Junior High in Blue Rapids, Kansas:

You would want to move second.  No matter what the first player chooses, the second player can choose the opposite and win.  For example, if there are 5 blocks left, player one can choose 2 and player two can choose 3.  There would then be no move for player one.
(March 2003)

eeps comments:

Woo-hoo! The first solution for this problem! Thank you for your explanation. it right? What do you think? Also, is it a complete explanation for what to do? That is, can you use it to decide what move to make in every situation?

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