![]() ![]() Swordfish Looks at strength of one type of candidate in N rows(location) to deduce strength Looks at strength of N candidates in N locations within a large container(s) toĭeduce strength of those N candidates in N cells Naked Pairs, Triples and Quads Looks at strength of N candidates in N cells to deduce strength of those NĬandidates in N locations within a large container(s) (row, column, box) to deduce strength of that candidate in location To what they are looking at and what deductions they allow: Unique Possibilities Finds singular strengths in any container Locked Candidates Looks at strength in location of one type of candidate in one large container The following list examines all the previous techniques covered in this blog, relative If you are paying attention, the restriction here of three is also artificial. Y wing style is then any consideration of three strong sets that proves Instead,Ĭonsider strength in any container - cell, box, column, row - to deduce To extend the idea of a Y wing simply remove the restrictions. Most techniques, tips, tricksĪbout how to solve sudoku puzzles stop before they generalize ideas. Finally, the first column must contain at least one truthĬlearly, all cells seen by both cell x and cell z cannot contain r.Ī Y wing considers strength in cells to deduce strength inĬandidate location.Also, The last two columns contain no more than two truths.Therefor, the matrix contains at least three truths.Most one true item in each of these last two columns Each column, except the first column, is a weak set.r,s,t are individual candidates - integers. ![]() The entries in the filled cells are boolean variables - thus true or false.To understand this forbidding matrix, consider: ![]() The following forbidding matrix exposes the logic of a typical Y wing: Since the vertex h1 of the Y wing is alreadyĮmpty of 1's, 1 can be excluded only from the cell e4.
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