dailysudoku.com

https://github.com/Urhegyi/Sudoku-Uploads/raw/main/candidate.png

Where are the squiggly sudokus for this month of March?

There was 1 puzzle in the monster collection which was never solved as it has multiple solutions (28-11-2005). I decided to fix it with adding 2 more clues so that it has a unique solution and has a v ...

A jigsaw sudoku solvable with as hardest step an x-wing.
https://github.com/Urhegyi/Sudoku-Uploads/raw/main/recently.png

Thank you for solving my jigsaw puzzle.
Yes, the x-wing was necessary and did the trick.

Nice to hear you had as much fun solving it as I had creating it.

Peter

any candidates to testsolve this?

https://github.com/Urhegyi/Sudoku-Uploads/raw/main/hungry.png

+-------+-------+-------+
| 1 . . | . 8 . | . . . |
| . . 5 | 4 . . | . . 6 |
| . . . | . . 2 | . 7 . |
+-------+-------+-------+
| . . 8 | . 5 . | . 9 . |
| 2 . . | . . 3 | 6 . . |
| . 6 . | ...

+-------+-------+-------+
| . . 6 | . . . | 2 . . |
| . 2 . | 4 . 7 | . 3 . |
| 3 . . | . . . | . . 1 |
+-------+-------+-------+
| . 4 . | 7 . 2 | . 9 . |
| . . . | . . . | . . . |
| . 8 . | ...

+-------+-------+-------+
| . . 6 | . . . | 2 . . |
| . 2 . | 4 . 7 | . 3 . |
| 3 . . | . . . | . . 1 |
+-------+-------+-------+
| . 4 . | 7 . 2 | . 9 . |
| . . . | . . . | . . . |
| . 8 . | ...

A sudoku as I like to see more in the daily sudokus. Only X,XY,XYZ wings, but this time a lot of them:

+-------+-------+-------+
| 6 . . | . . 2 | . . . |
| . 2 . | . . . | . 5 . |
| . . 3 | . 5 ...

+-------+-------+-------+
| 9 . . | . 2 . | . . . |
| . 1 . | . . . | . 6 . |
| . . 2 | 7 . . | . . 4 |
+-------+-------+-------+
| . . 1 | . . . | 9 . . |
| . . . | . 4 . | . . 5 |
| . 5 . | ...

This one looks like it can be solved using just basics.confirmed

+-------+-------+-------+
| 9 . . | . . . | . . . |
| . . 8 | . . . | . . 3 |
| . . . | . . 2 | 7 . . |
+-------+-------+-------+
| . . . | 7 . . | 6 . 5 |
| . . 3 | 9 . . | 1 . 4 |
| 2 . . | ...

Dongrave found 4 of the 5 steps:
1)x-wing on 9's in cols 1&4
2)x-wing on 3's in cols 4&7
3)xyz-wing 578 with pivot at R6C7 (R4C7!=5)
4)xy-wing 58-3 with pivot at R4C5 (R4C4!=3 and R5C8!=3) ...

I found 3 xy-wings to start(2 of them are needed).
After this an x-wing and an xyz-wing eliminating 2 candidates from R2C6 leads to a triple in row 2 and further solves with basics.

I think this must be a mistake by the internal rating function. It doesn't need any vh step.

+-------+-------+-------+
| 1 . . | . . 7 | 9 . 4 |
| . 3 . | . 8 . | . . . |
| . . . | . . 6 | . 2 . ...

+-------+-------+-------+
| . . . | . . . | 1 . 3 |
| . 6 . | 9 . 3 | . 4 . |
| 5 . . | . . . | . . . |
+-------+-------+-------+
| . . . | 5 . 4 | . 9 . |
| 2 . 8 | . . . | . . . |
| . 5 . | ...

In case anyone will try the classical solution with only xy(z) wings requires 2 xyz-wings and 2 xy-wings that are all necessary to solve.

Solved with only basic techniques.

The swordfish is the three rows/columns equivalent of the x-wing with only two rows/columns. I've looked to a few daily puzzles published in the last years and found only two of them where swordfishes ...