![]() See figure 2 below.īecause of this we know that r6c5 must be a 6 and we also know we can now place the 6 in box 6. ![]() Because of the hidden corner pattern in box 6 we now know that the 1 is constrained to row 6 in box 6 (the cells with red circles). Now that we know the corner pattern is there we can look for other numbers. In this example the 25 twins are there but we can't solve them yet. There is still a corner pattern (a hidden one) if the twins can't be solved because no other numbers can fit in those two cells. If they can be solved the diagonal pattern becomes a corner pattern. Take a look at figure 1 and convince yourself that this is so. Figure 1 has a 2 and a 5 in both row 6 and column 9 and therefore the green circled cells are 25 twins. If you can find two numbers that are in both the row and the column and they aren't already in the box then you have found twins. When this pattern is found look at the row and the column in the box that don't contain either of the two numbers (in this case row 6 and column 9). If twins are found they would be in the green circled cells. This pattern allows us to look for twins. When two numbers are kitty-corner from each other in a box, or in other words the corners of the numbered cells are touching, the diagonal pattern exists. ![]() There can be more than two numbers in a box that has the diagonal pattern but only two numbers are needed for the diagonal pattern to exist. If twins are found it can help find other numbers. The diagonal pattern can be found with only two numbers in a box. If Sudoku Primer and the YouTube channel have helped you, consider donating a little
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