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      Question

      For a 4x4 chessboard, if the first queen is placed at

      (0, 1) (row 0, column 1), which of the following positions would be the *first valid position* for the second queen (row 1)?
      A (1, 0) Correct Answer Incorrect Answer
      B (1, 2) Correct Answer Incorrect Answer
      C (1, 3) Correct Answer Incorrect Answer
      D (1, 1) Correct Answer Incorrect Answer
      E No valid position in row 1. Correct Answer Incorrect Answer

      Solution

      (If Q1 is at (0,1), then (1,0) is attacked diagonally, (1,1) is attacked by column, (1,2) is attacked diagonally. (1,3) is safe.)

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