The "Pointing Triples" solving method is very similar to the "Pointing Pairs."
A "Pointing Triples" applies if a candidate appears only in three cells of a 3x3 block, and all three of those cells belong to the same row or column. Это означает the solution for that candidate within this block must be in one of these three cells. Поэтому, it obviously cannot be the solution for any other cell in that row or column, and it can be eliminated from them.
Например:
Давайте посмотрим на the bottom-right block. In this block, all the cells that could possibly contain the number 1 are in a single row. Since the number 1 must appear at least once in the bottom-right block, one of the highlighted cells must contain the 1.
After reaching this conclusion, you can safely remove all other possible instances of the number 1 from the заметки in this row to avoid confusion.
Remember that you can use the same technique for blocks, rows, and columns.
Это the principle of the "Pointing Triples" solving method. После того, как вы изучили это, you can get some practice.