There is a lot covered in this video, so pause and rewind to get the most out. But logic ensures that the 4 in B8 can be safely removed, and ensure that Sudoku can be solved. Triplets 101, some people call them Triples, either way its a useful strategy. The Quad is barely hidden – just by one number. In column 8 we have a Hidden Quad with the numbers 3/5/6/7 spread over B8, D8, E8 and F8. Just like Naked pairs we can extend Hidden Pairs and Triples to Quads and even beyond. In the example below we have 1/4/6, 1/4 and 1/4/6 in three cells. We don't need exactly three pairs of numbers in three cells for the rules to apply. A Triple will consist of three pairs of numbers lying in three cells in the same unit (row, column or box), Such as 4/8/9, 4/8/9 and 4/8/9 hidden behind other candidates However, Hidden Triples are more interesting and follow a similar idea as Naked Triples. The objective of Sudoku is to fill a 9x9 grid made of squares (shown above circled in blue) so that each row, each column, and each full 9x9 square use the numbers 1-9. We can easily extend Hidden Pairs to Hidden Triples or even Hidden Quads.
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