Mohammad

a quick google search leads to berg lake in canada. The landscape looks very similar although I cant find the exact photo

Would the situation be different if S1 was the one who wanted to publish the article? Is the contribution of S2 sufficient to prevent him from publishing the article?

@Adelin yeah sorry for confusing you but I usually eliminate obsolete possibilities on the go.

@Adelin You shouldn't be thinking: "Which cells can have a 5?". Instead, you need to think: "Can the cells in row 5 and row 9 have anything except 3 and 5?" Since they can't, and we should be able to fill all the cells. Then 3 and 5 can only be in these cells. For that, we eliminate the possibilities of 3 and 5 occurring in all other places in that column.

@Adelin I don't think you understood the point. You have to look only a column 8. In a sudoku any column should have the numbers from 1 to 9 only once. If we apply this concept to column 8 we can see the cells in row 5 and 9 can have only the values of 3 and 5. If one of them is 3 the other should definitely be a 5. If you are still confused, please look at the link in the above comment to know more about naked pairs.

@Adelin no it is not possible. What will the value of row 9 column 8 be then? When you have two cells in the way explained above they are called naked pairs: sudokuoftheday.com/techniques/naked-pairs-triples

@VotBear, thanks for the remark please see the updated answer

@Adelin I have updated the answer with the proper explanation.

@Adelin if you look at thd possible numbers at that cell, you can see there is only a 7. What makes you think there should be a 5

@HashirOmer mutaa is different from prostitution as permanent marriage is.

write*

walaykum alsalam

thanks

@ProgramFOX nothing actually, I followed your steps here: meta.codegolf.stackexchange.com/a/1617/12291 and made a simple script to post a message I didn't know it worked. Sorry to bother you.

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