You can practice this strategy by installing the free SudokuCoach application on your Androidâ„¢ device. Hence 1 may not be the solution in A1 nor in C1 3 may not be the solution in B1, B3 nor in C1 4 may not be the solution in C1 finally, 5 may not be the solution in B3. Each of these candidates must be present in one of these cells. The hidden pairs, triples, and quads technique includes searching for a set of candidates that can only appear in the proper number of squares, then removing other candidates from those same. In the example above, cells A2, B2, C2 and C3 form a Naked Quad in Square "1": four cells with exactly four possible candidates. Strategy for Hidden Pairs, Hidden Triples, and Hidden Quads Naked Pairs, Triples, and Quads are logical extensions of Hidden Pairs, Triples, and Quads. When a duo (triple or quads) of digits appears in precisely two squares in a row, column, or block, but they aren't the only ones in those squares, it's called a hidden pair. The Hidden Pair, Triples, and Quads Strategy. Hence none of these four candidates can be the solution in any other Cell of that region these four candidates can be deleted from the other Cells of that region. The 'only choice' sudoku strategy, in which we looked at individual squares rather than groups, is not applicable here. If four Cells in a region (Row, Column or Square) contain exactly the same four candidates or only subsets of these four candidates, then one of these candidates is the solution for the first of these Cells, a second one is the solution for the second of these Cells, a third one is the solution for the third of these Cells and the last candidate is the solution for the fourth Cell.
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