The New Sudoku Players' Forum

[Sudtyro]

The following 3’s candidate grid came up in a recent puzzle after running through the basics. The candidate in r2c2, if false, would reveal two complementary X-wings, either of which would then eliminate the two candidates in r34c6, which is the correct solution. Candidate r2c2 doesn’t seem to fit the definition of a fin, so, short of trial & error, is there a single-digit rule (colors, chain, etc) that also eliminates these three candidates? Probably something simple, but can’t seem to spot it!

Code: Select all

. . . | . . . | . . .
3 3 . | . . 3 | . . .
. 3 . | . 3 3 | . . .
------+-------+------
. 3 . | . 3 3 | . . .
. . . | . . . | . . .
3 . . | . . 3 | . . .
------+-------+------
. . . | . . . | . . .
. . . | . . . | . . .
. . . | . . . | . . .


[ronk]

Probably something simple, but can’t seem to spot it!

Code: Select all

. . . | . . . | . . .
3 3 . | . . 3 | . . .
. 3 . | . 3 3 | . . .
------+-------+------
. 3 . | . 3 3 | . . .
. . . | . . . | . . .
3 . . | . . 3 | . . .
------+-------+------
. . . | . . . | . . .
. . . | . . . | . . .
. . . | . . . | . . .


There are dual finned x-wings, but there are no eliminations.

Finned x-wing r26\c16 plus fin r2c2 would make eliminations r13c1<>3. Finned x-wing c25\r34 plus fin r2c2 would make eliminations r3c13<>3. But those cells contain no candidates.

[Sudtyro]

Nice to have the fin definition clarified. I'd assumed that a fin, to be a fin, would imply at least one elimination. Thanks for the feedback.