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.

Naked Single Explanation
Hidden Single Explanation
Hidden Pair Explanation
Locked Candidates Explanation
Full House Explanation
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)
Show More...