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

This Sudoku Puzzle has 45 steps and it is solved using Locked Candidates Type 1 (Pointing), Naked Single, Hidden Single, Locked Candidates Type 2 (Claiming), undefined, Hidden Rectangle, Naked Pair, Full House techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 5 in b1 => r8c2<>5
  2. Locked Candidates Type 1 (Pointing): 2 in b2 => r2c2379<>2
  3. Row 2 / Column 2 → 5 (Naked Single)
  4. Row 1 / Column 9 → 5 (Hidden Single)
  5. Locked Candidates Type 2 (Claiming): 8 in c1 => r78c3,r8c2<>8
  6. 2-String Kite: 9 in r6c2,r7c6 (connected by r7c3,r8c2) => r6c6<>9
  7. Hidden Rectangle: 2/9 in r2c56,r6c56 => r2c6<>9
  8. Hidden Rectangle: 4/5 in r8c17,r9c17 => r8c1<>4
  9. XY-Chain: 2 2- r8c2 -9- r6c2 -8- r6c6 -2- r2c6 -4- r2c3 -1- r2c9 -3- r8c9 -2 => r8c37<>2
  10. XY-Chain: 4 4- r2c3 -1- r2c9 -3- r8c9 -2- r8c2 -9- r6c2 -8- r6c6 -2- r2c6 -4 => r2c5<>4
  11. Locked Candidates Type 2 (Claiming): 4 in c5 => r7c6,r8c4<>4
  12. Naked Pair: 8,9 in r7c6,r8c4 => r8c5<>9
  13. W-Wing: 9/8 in r4c3,r7c6 connected by 8 in r6c26 => r4c6,r7c3<>9
  14. Row 7 / Column 6 → 9 (Hidden Single)
  15. Row 8 / Column 4 → 8 (Naked Single)
  16. Row 7 / Column 1 → 8 (Hidden Single)
  17. XY-Chain: 1 1- r2c3 -4- r7c3 -2- r1c3 -8- r4c3 -9- r4c4 -4- r3c4 -9- r3c7 -2- r3c9 -1 => r2c9,r3c1<>1
  18. Row 2 / Column 9 → 3 (Naked Single)
  19. Row 3 / Column 1 → 4 (Naked Single)
  20. Row 2 / Column 7 → 9 (Naked Single)
  21. Row 8 / Column 9 → 2 (Naked Single)
  22. Row 3 / Column 9 → 1 (Full House)
  23. Row 3 / Column 7 → 2 (Full House)
  24. Row 3 / Column 4 → 9 (Full House)
  25. Row 4 / Column 4 → 4 (Full House)
  26. Row 2 / Column 3 → 1 (Naked Single)
  27. Row 2 / Column 5 → 2 (Naked Single)
  28. Row 2 / Column 6 → 4 (Full House)
  29. Row 7 / Column 7 → 4 (Naked Single)
  30. Row 7 / Column 3 → 2 (Full House)
  31. Row 8 / Column 2 → 9 (Naked Single)
  32. Row 4 / Column 6 → 8 (Naked Single)
  33. Row 4 / Column 3 → 9 (Full House)
  34. Row 6 / Column 2 → 8 (Full House)
  35. Row 6 / Column 6 → 2 (Full House)
  36. Row 6 / Column 5 → 9 (Full House)
  37. Row 1 / Column 2 → 2 (Full House)
  38. Row 1 / Column 3 → 8 (Full House)
  39. Row 8 / Column 3 → 4 (Full House)
  40. Row 9 / Column 7 → 5 (Naked Single)
  41. Row 8 / Column 7 → 3 (Full House)
  42. Row 8 / Column 5 → 1 (Naked Single)
  43. Row 8 / Column 1 → 5 (Full House)
  44. Row 9 / Column 1 → 1 (Full House)
  45. Row 9 / Column 5 → 4 (Full House)
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