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BEBRAS 2023 Grade 7-8 Round 2 Ext Question 12

BEBRAS · BEBRAS 2023 Grade 7-8 Round 2 Ext

Question 12

In COL, two players take turns placing their own pieces on empty vertices of the pictured board. One plays white and the other gray. A player loses if two of their own pieces occupy vertices joined by a line. The example shows White losing.

Question illustration

In the following current position, where should White play to guarantee victory?

Question illustration
  1. Position 2
  2. Position 5
  3. Position 7
  4. Position 5 or 7