Fortune Telling Collection - Zodiac Analysis - Who can explain in detail the use principle of ur and ar in Sudoku?
Who can explain in detail the use principle of ur and ar in Sudoku?
Avoidable Rectangle is a technique to "reverse" the unique rectangle deletion method: after all three vertices of the "rectangle" are filled, it is found that the fourth vertex must not be filled with numbers that constitute a fatal pattern.
As shown in figure 1, when we do this, we find that A, B and D are all filled with numbers. If we put these three squares and c together, it just constitutes "9-? -9-4 inch structure. C is an unknown number. C If you fill in 4, it will constitute the fatal structure of "9-4-9-4", so it is wrong to fill in 4, so C≠4. Get the solution c = 1.
All four vertices must be the numbers we fill in, and there can be no hints. Because deadly patterns are filled in by ourselves, once there is a prompt number, we will reason according to the prompt number, so there will be no case of judging whether it can be filled in according to uniqueness.
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