Pattern: Right Angle


<< Return to patterns page

Next pattern: opposite pattern >>

Introduction

The right angle pattern can help you find numbers when there is only one of the same number in both a row and a column. It is a mix between the diagonal and the corner pattern. When a number fits into the right angle pattern it makes a corner pattern.

Details

The right angle pattern is seen when three cells that are at ‘right angles’ with each other have numbers. Here is an example of several right angle patterns.

Sudoku grid with numbers partially filled in.  Box 2, 4, 6 and 8 each have a right angle pattern in them
Figure 1

Look at boxes 2, 4, 6 and 8. They all have three cells populated and each one of them have a right angle pattern.

When a right angle pattern exists it gives us the opportunity to find a number by looking at the row and the column that aren’t a part of the pattern. Look at box 2 in figure 2 below. Row 1 and column 4 aren’t a part of the right angle pattern in that box. That means we can look at that row and column for a single number that is a) in both the row and column that is b) not already in box 2.

Sudoku grid with numbers partially filled in.  Box 2 has arrows in it, two pointing left and right in row 1 and one pointing down in column 4
Figure 2

There is an 8 in row 1 and column 4. Box 2 doesn’t have an 8, so 8 is the only number that can fit in the ‘pocket’ of the right angle pattern. The number in r2c5 is therefore 8.

Now let’s look at box 4. Follow the same logic and you will see that the ‘pocket’ of the right angle pattern in box 4 holds a 2. Box 6 has a 1 in the pocket of its pattern and box 8 has a 6. See figure 3 below and convince yourself that each of the green numbers belong in their respective cells.

Sudoku grid with numbers partially filled in with four additional green numbers in boxes 2, 4, 6 and 8 which represent the numbers found because of the right angle pattern
Figure 3

Summary

Finding right angle patterns and filling in their 'pocket' will benefit you with both a number and a corner pattern. This will help find other numbers because a corner pattern can also help you find numbers.

Video about the diagonal pattern

This video talks about the right angle pattern and shows examples of it.

Skill Levels

The right angle pattern can be found in any skill level puzzle.

Next pattern: opposite pattern >>

<< Return to patterns page





If this website and YouTube channel have helped you, consider donating



Thanks in advance for your support!



More About Sudoku





Sudoku - the puzzle that addicts