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Triangular Connection

In Sudoku-X, the triangular connection technique can be stated as follows:

Consider a digit X. Suppose a diagonal contains only two cells that has X as a candidate, call them A and B. Suppose another constraint contains only two cells that has X as a candidate, call them C and D. If A and C are peers, then we can eliminate X from any cell that is seen by both B and D.

Double crossover is a special case of Triangular Connection, where the constraint containing C and D is the other diagonal.

Like the Double Crossover technique, the triangular connection technique can be replicated using Color Wing with two clusters, or by using the following chain: 

(X): B = A - C = D

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See Also

This page was last modified 19:54, 27 September 2007.