Sudoku Solving Techniques

Every pattern KaizenDoku's post-game analysis can spot on your own boards, explained with real, worked examples — from the basics through the advanced patterns competitive solvers use.

5
3
7
6
1
9
5
9
8
6
8
6
3
4
8
5
3
1
7
2
6
6
2
8
4
1
9
5
8
7
9
Easy

Naked Single
5
3
7
1
6
1
9
5
9
8
6
8
6
3
4
8
3
1
7
2
6
6
2
8
4
1
9
5
8
7
9
Easy

Hidden Single
9
35
7
4
2
1
8
35
7
5
34
2
6
1
9
4
5
4
5
7
9
9
2
1
8
3
4
5
9
5
7
Medium

Naked Pair
5
3
7
6
1
9
5
9
8
6
8
6
3
4
8
3
1
7
2
6
139
6
134579
2
8
4
1
9
5
8
7
9
Medium

Hidden Pair
5
3
7
6
1
9
5
3478
2478
9
8
6
8
6
3
4
8
3
1
7
2
6
6
2
8
4
1
9
5
8
7
9
Medium

Pointing Pairs
5
3
7
6
1
9
5
9
8
6
8
6
3
4
8
3
1
7
2
6
6
2
8
4
1
9
5
8
7
9
Medium

Box Line Reduction
9
7
4
2
1
8
348
1489
7
5
2
6
1
9
4
5
4
5
7
9
9
2
1
8
3
4
5
9
5
7
Hard

X-Wing
9
7
4
2
1
8
7
5
2
6
1
9
4
5
4
5
7
9
9
2
1
8
34567
3
4
5
9
5
7
23468
Expert

Swordfish
9
7
4
2
1
8
7
5
2
6
1
9
4
5
4
5
7
9
9
2
1
8
3
4
5
9
5
7
Advanced

Unique Rectangle

KaizenDoku shows you which of these you actually used after every game you play.

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