More Y-Wings and Other Chains
5:34
Advanced Sudoku Solving: Uniqueness revisited
3:30:33
The Hardest Sudoku I've EVER Solved
17:31
Diabolical sudoku: Finned X-Wings
32:50
MIT Entrance Exam from 1869! – Can you solve it?
16:32
Sudoku Masterclass: Y-Wing Into Y-Wing
28:59
Extreme Sudoku: Finned Fish, XYZ Wings And Empty Rectangles
16:23
Improve At Sudoku: What To Do When You Get Stuck
21:58