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Before starting
1. The singles
1.1. Naked single
1.2. Hidden single
2. Locked candidates
2.1. Segment 1
2.2. Segment 2
3. The subsets
3.1. Naked subsets
3.1.1. Naked pair
3.1.2. Triplet et quad
3.2. Hidden subsets
4. Complex methods
4.1. Associated pairs (X-wing)
4.2. Multiple associated pairs (Swordfish)
4.3. Linked candidates(coloring)
4.4. Forced chains
5. Guesswork/Nishio

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Solving methods > 4- Complex methods > 4.2 Multiple associated pairs (Swordfish)

This method is a more complex variant of the preceding one (4.1 Associated pairs).
One can apply it when, for a given candidate, three rows contain at most three times such candidate and that these candidates are found on the same three columns.
The candidate can then be excluded from the three columns formed (except the original candidates). The same method applies in the case of three columns, the excluded candidates will then be on the rows.

For the C, F and H columns, 2 is only possible in two cells. These possibilities are found on three rows, the 2nd, 4th and 8th.

On the 2nd row, 2 will necessarily be either in F2 or H2, in C4 or H4 on the 4th, and C8 or F8 on the 8th row.

One can thus exclude 2 from the other cells in these rows (A2, B4 and G4 in yellow in this example).

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