显性唯一Naked Singles
定义1 最后一数 Full House
是一个特殊的情况。当一个行/列/宫内只缺少一个空格时,这里就是最后一数,我们可以直接补全它。
Full house is a special example. When a Row/Column or Box has only one cell empty, that's a Full House, we can fill it.
定义2 显性唯一Naked Singles
当一个格只能有一种候选数时,这个格必定是该候选数。
When a cell has only one candidate, the cell must be that number.
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