“唯余空白格”是一种基本的数独解法。这种解法非常简单并基于以下事实：数独盘面中的每个 3×3 宫、每一行或每一列中都应包含数字 1 到 9，并且每个数字在每个 3×3 宫、每一行或每一列中只能使用一次。
因此，如果我们看到一个 3×3 宫、一行或一列中只剩下一个可用单元格，那么我们必须明确缺少 1 到 9 中的哪个数字，并将它填入这个空白单元格。
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