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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Naked Triple, Naked Single, Locked Candidates Type 2 (Claiming), Hidden Pair, Uniqueness Test 2, undefined, Finned Swordfish, Locked Pair, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 4 → 8 (Hidden Single)
  2. Naked Triple: 1,6,8 in r9c137 => r9c45<>1, r9c5<>6, r9c9<>8
  3. Row 9 / Column 9 → 9 (Naked Single)
  4. Row 5 / Column 9 → 8 (Hidden Single)
  5. Locked Candidates Type 2 (Claiming): 1 in r9 => r7c3,r8c1<>1
  6. Hidden Pair: 1,8 in r49c3 => r4c3<>2, r4c3<>3, r9c3<>6
  7. Uniqueness Test 2: 2/4 in r6c45,r9c45 => r4c46,r6c1<>1
  8. Row 4 / Column 3 → 1 (Hidden Single)
  9. Row 9 / Column 3 → 8 (Naked Single)
  10. Row 9 / Column 7 → 6 (Naked Single)
  11. Row 9 / Column 1 → 1 (Naked Single)
  12. Row 4 / Column 2 → 8 (Hidden Single)
  13. Row 8 / Column 7 → 8 (Hidden Single)
  14. Finned X-Wing: 5 r28 c18 fr2c7 => r1c8<>5
  15. Almost Locked Set XZ-Rule: A=r14679c4 {124579}, B=r1278c6 {12679}, X=9, Z=2 => r3c4<>2
  16. Almost Locked Set XZ-Rule: A=r4679c4 {12479}, B=r1278c6 {12679}, X=9, Z=2 => r1c4<>2
  17. Almost Locked Set XY-Wing: A=r7c9 {57}, B=r12c8,r23c7,r3c9 {234567}, C=r4578c8 {12457}, X,Y=4,5, Z=7 => r1c9<>7
  18. Finned Swordfish: 7 r158 c568 fr1c4 => r2c56,r3c5<>7
  19. Locked Pair: 2,6 in r2c56 => r1c6,r2c128,r3c5<>6, r1c6,r2c278,r3c5<>2
  20. Row 3 / Column 5 → 9 (Naked Single)
  21. Row 1 / Column 8 → 6 (Hidden Single)
  22. Row 7 / Column 4 → 9 (Hidden Single)
  23. Row 5 / Column 6 → 9 (Hidden Single)
  24. Row 3 / Column 7 → 2 (Hidden Single)
  25. Row 8 / Column 2 → 9 (Hidden Single)
  26. Row 4 / Column 6 → 3 (Hidden Single)
  27. Row 4 / Column 7 → 7 (Naked Single)
  28. Row 2 / Column 6 → 2 (Hidden Single)
  29. Row 2 / Column 5 → 6 (Naked Single)
  30. Row 5 / Column 5 → 7 (Hidden Single)
  31. Row 8 / Column 5 → 1 (Naked Single)
  32. Row 6 / Column 4 → 1 (Hidden Single)
  33. Row 7 / Column 8 → 1 (Hidden Single)
  34. Row 1 / Column 6 → 1 (Hidden Single)
  35. Row 1 / Column 4 → 7 (Hidden Single)
  36. Row 3 / Column 4 → 5 (Full House)
  37. Locked Pair: 2,4 in r45c8 => r2c8,r6c9<>4
  38. Row 1 / Column 9 → 4 (Hidden Single)
  39. Row 1 / Column 2 → 2 (Naked Single)
  40. Row 1 / Column 3 → 5 (Full House)
  41. Row 5 / Column 3 → 2 (Hidden Single)
  42. Row 5 / Column 8 → 4 (Naked Single)
  43. Row 5 / Column 1 → 3 (Full House)
  44. Row 4 / Column 8 → 2 (Naked Single)
  45. Row 4 / Column 4 → 4 (Full House)
  46. Row 6 / Column 5 → 2 (Full House)
  47. Row 9 / Column 4 → 2 (Full House)
  48. Row 9 / Column 5 → 4 (Full House)
  49. Row 8 / Column 1 → 5 (Hidden Single)
  50. Row 8 / Column 8 → 7 (Naked Single)
  51. Row 2 / Column 8 → 5 (Full House)
  52. Row 7 / Column 9 → 5 (Full House)
  53. Row 8 / Column 6 → 6 (Full House)
  54. Row 7 / Column 6 → 7 (Full House)
  55. Row 2 / Column 7 → 3 (Naked Single)
  56. Row 3 / Column 9 → 7 (Full House)
  57. Row 6 / Column 9 → 3 (Full House)
  58. Row 6 / Column 7 → 5 (Full House)
  59. Row 2 / Column 2 → 4 (Naked Single)
  60. Row 2 / Column 1 → 7 (Full House)
  61. Row 3 / Column 1 → 6 (Naked Single)
  62. Row 3 / Column 3 → 3 (Full House)
  63. Row 6 / Column 1 → 4 (Full House)
  64. Row 6 / Column 2 → 6 (Full House)
  65. Row 7 / Column 3 → 6 (Full House)
  66. Row 7 / Column 2 → 3 (Full House)
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