### Tight Fit Sudoku (Unique Pairs) by Chris Green

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or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between Sudoku = big digits and Number candidate = small entries in the corners of cells.)

Theme: Sweeping Diagonals

Author/Opus: This is the 9th puzzle from guest contributor Chris Green.

Rules: Standard Tight Fit Sudoku rules. Also, looking across all of the Tight Fit cells in both grids, each Tight Fit cell must have a unique pair of digits.

Answer String: In the top grid, enter the 1st row from left to right, followed by a comma, followed by the 4th row from left to right; then, after another comma, in the bottom grid enter the 4th row from left to right, followed by a comma, followed by the 6th row from left to right. (Note: for the tight fit cells, enter the top before the bottom as would be normal for the read order.)

Time Standards (highlight to view): Grandmaster = 11:15, Master = 20:00, Expert = 40:00

Solution: PDF

Note: Follow this link for other Tight Fit Sudoku puzzles on this website. If you are new to this puzzle type, here are our easiest Tight Fit Sudoku to get started on. More Tight Fit Sudoku can be found in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli and in The Art of Sudoku 2.

• skynet says:

A Heavy dislike for this puzzle.Involved too much book keeping.Realized posthumous to solving that it would have been much better to write all possibilities and then strike them off one by one…Even then it would have been a herculean effort to complete this.

• nkm says:

Just did this for the second time after it was posted in the “Best of 2019”. Much improved this time, thanks to the realization that rnpu ahzore nccrnef rknpgyl sbhe gvzrf bhgfvqr bs gvtug svg cnvef.

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