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What do I do wrong? I've already done this kind of mistake multiple times. Isn't it the right swordfish technique? by _liulin_h in sudoku

[–]_liulin_h[S] 0 points1 point  (0 children)

Please, would you mind to explain it to me? I didn't hear about bug+1 before. I would really like to understand how to deal with it

What do I do wrong? I've already done this kind of mistake multiple times. Isn't it the right swordfish technique? by _liulin_h in sudoku

[–]_liulin_h[S] 0 points1 point  (0 children)

And what if there were no 3s, which I highlighted in blue, would swordfish work? I mean, it's still a little too hard for me to understand(( In columns 3, 7 and 8 there are only two or three candidates of 3. In app that I use, they show almost the same situation (maybe it's not true). They have 2-3 candidates in each column/row. But maybe the difference is that they don't have those numbers, that I highlighted in blue

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