“唯一剩余格”是另一种基础数独策略。它基于以下事实：数字在每个 3×3 宫、每行或每列中不能重复。
我们来看看 3×3 宫的例子。在每宫、每行和每列中，始终都必须包含数字 8。现在行和列中已经有了 8。我们已经知道，数字不能重复。因此，我们不能再将 8 填到那里。这说明这个宫里只剩下一个单元格，我们应该将 8 填在那里。
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