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Save our souls (Posted on 2016-06-03) Difficulty: 3 of 5
Imagine a row of 2000 squares. Two players in turn write either an S or an O in an empty square.
The first player who produces three consecutive boxes that spell SOS wins.
If all boxes are filled without producing SOS then the game is a draw.

Prove that the second player has a winning strategy.

Source: (USAMO ’99)

No Solution Yet Submitted by Ady TZIDON    
Rating: 4.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionFor the win (spoiler)Steve Herman2016-06-03 20:49:03
No Subjectarmando2016-06-03 16:42:20
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