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This Sudoku Puzzle has 59 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Quadruple, Naked Single, Locked Candidates Type 2 (Claiming), Hidden Pair, Locked Pair, Full House techniques.

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

Solution Steps:

  1. Row 4 / Column 5 → 4 (Hidden Single)
  2. Locked Candidates Type 1 (Pointing): 7 in b7 => r7c456<>7
  3. Naked Quadruple: 1,5,8,9 in r7c456,r8c6 => r8c45<>1, r8c4<>5, r8c45<>8, r8c45<>9
  4. Row 8 / Column 4 → 6 (Naked Single)
  5. Row 8 / Column 5 → 6 (Naked Single)
  6. Locked Candidates Type 2 (Claiming): 6 in r5 => r6c78<>6
  7. Hidden Pair: 3,6 in r8c78 => r8c78<>1, r8c78<>4
  8. Row 8 / Column 7 → 3 (Naked Single)
  9. Row 8 / Column 8 → 3 (Naked Single)
  10. Row 8 / Column 6 → 1 (Hidden Single)
  11. Locked Pair: 4,6 in r23c7 => r23c8,r5c7<>6, r23c8,r7c7<>4
  12. Row 2 / Column 8 → 5 (Naked Single)
  13. Row 3 / Column 8 → 5 (Naked Single)
  14. Row 5 / Column 8 → 6 (Hidden Single)
  15. Row 7 / Column 8 → 4 (Hidden Single)
  16. Row 7 / Column 7 → 1 (Hidden Single)
  17. Locked Pair: 4,9 in r23c2 => r23c3,r45678c2<>9, r23c3,r8c2<>4
  18. Row 2 / Column 3 → 6 (Naked Single)
  19. Row 3 / Column 3 → 6 (Naked Single)
  20. Row 2 / Column 7 → 4 (Naked Single)
  21. Row 3 / Column 7 → 4 (Naked Single)
  22. Row 2 / Column 2 → 9 (Naked Single)
  23. Row 3 / Column 2 → 9 (Naked Single)
  24. Row 8 / Column 3 → 4 (Hidden Single)
  25. Row 8 / Column 2 → 5 (Hidden Single)
  26. Row 7 / Column 3 → 9 (Hidden Single)
  27. Row 7 / Column 5 → 8 (Naked Single)
  28. Row 7 / Column 2 → 7 (Full House)
  29. Row 7 / Column 4 → 5 (Full House)
  30. Row 7 / Column 6 → 5 (Full House)
  31. Row 3 / Column 5 → 1 (Naked Single)
  32. Locked Candidates Type 2 (Claiming): 3 in r2 => r3c46<>3
  33. Row 3 / Column 4 → 8 (Naked Single)
  34. Row 3 / Column 6 → 8 (Naked Single)
  35. Locked Candidates Type 2 (Claiming): 8 in c2 => r456c3<>8
  36. Locked Candidates Type 2 (Claiming): 9 in c4 => r456c6,r56c5<>9
  37. Locked Pair: 2,7 in r56c5 => r2c5,r456c6<>2, r2c5,r4c46,r5c46,r6c46<>7
  38. Row 2 / Column 5 → 7 (Naked Single)
  39. Row 4 / Column 6 → 7 (Naked Single)
  40. Row 5 / Column 6 → 3 (Naked Single)
  41. Row 6 / Column 6 → 3 (Naked Single)
  42. Row 2 / Column 4 → 3 (Naked Single)
  43. Row 5 / Column 5 → 2 (Naked Single)
  44. Row 6 / Column 5 → 2 (Naked Single)
  45. Row 4 / Column 3 → 2 (Naked Single)
  46. Row 2 / Column 6 → 2 (Naked Single)
  47. Row 5 / Column 3 → 7 (Naked Single)
  48. Row 6 / Column 3 → 7 (Naked Single)
  49. Row 4 / Column 8 → 1 (Naked Single)
  50. Row 6 / Column 8 → 1 (Naked Single)
  51. Row 4 / Column 2 → 8 (Naked Single)
  52. Row 4 / Column 4 → 9 (Naked Single)
  53. Row 6 / Column 2 → 8 (Naked Single)
  54. Row 6 / Column 4 → 9 (Naked Single)
  55. Row 4 / Column 7 → 9 (Naked Single)
  56. Row 5 / Column 2 → 1 (Naked Single)
  57. Row 5 / Column 4 → 1 (Naked Single)
  58. Row 6 / Column 7 → 9 (Naked Single)
  59. Row 5 / Column 7 → 8 (Naked Single)
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