3x3 ブロックの例を見てください。どのブロック、縦の列、横の列にも数字の 8 が必ず入ります。縦の列と横の列にはすでに 8 があります。同じ数字を使えないのはもう知っていますからここに 8 は入りません。つまり、ブロックの中で 8 を入れられるマスは 1 つだけです。
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