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

This Sudoku Puzzle has 62 steps and it is solved using Locked Candidates Type 1 (Pointing), Skyscraper, undefined, Uniqueness Test 4, Sue de Coq, Empty Rectangle, Naked Single, Hidden Single, Naked Pair, AIC, Naked Triple, Hidden Rectangle, Finned Swordfish, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 6 in b1 => r3c8<>6
  2. Locked Candidates Type 1 (Pointing): 2 in b6 => r8c7<>2
  3. Skyscraper: 5 in r3c3,r7c1 (connected by r37c7) => r2c1,r89c3<>5
  4. Skyscraper: 3 in r8c7,r9c2 (connected by r6c27) => r8c3,r9c89<>3
  5. W-Wing: 3/6 in r1c9,r4c3 connected by 6 in r14c8 => r4c9<>3
  6. Uniqueness Test 4: 2/7 in r8c68,r9c68 => r89c8<>7
  7. Sue de Coq: r9c123 - {35789} (r9c5 - {59}, r7c2 - {78}) => r78c1,r8c3<>7, r7c1<>8, r9c9<>5
  8. Empty Rectangle: 7 in b3 (r7c28) => r2c2<>7
  9. Row 2 / Column 2 → 9 (Naked Single)
  10. Row 5 / Column 1 → 9 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 1 in b4 => r6c79<>1
  12. Naked Pair: 3,6 in r16c9 => r4c9<>6, r8c9<>3
  13. AIC: 8 8- r4c1 =8= r5c2 =2= r5c7 -2- r6c7 -3- r8c7 =3= r8c8 =2= r9c8 =1= r9c9 -1- r5c9 -8 => r4c89,r5c2<>8
  14. Row 4 / Column 9 → 4 (Naked Single)
  15. Row 5 / Column 2 → 2 (Naked Single)
  16. Row 4 / Column 1 → 8 (Hidden Single)
  17. Row 6 / Column 7 → 2 (Hidden Single)
  18. Row 8 / Column 7 → 3 (Hidden Single)
  19. W-Wing: 5/7 in r8c9,r9c1 connected by 7 in r7c28 => r8c1<>5
  20. W-Wing: 7/5 in r8c9,r9c1 connected by 5 in r7c17 => r9c9<>7
  21. Naked Pair: 1,8 in r59c9 => r2c9<>1, r2c9<>8
  22. Naked Triple: 1,5,7 in r2c9,r3c78 => r2c78<>1, r2c7<>5, r2c8<>7
  23. Locked Candidates Type 1 (Pointing): 1 in b3 => r3c3<>1
  24. Hidden Rectangle: 1/7 in r2c13,r6c13 => r6c3<>7
  25. Finned Swordfish: 7 r367 c128 fr3c3 => r2c1<>7
  26. Row 2 / Column 1 → 1 (Naked Single)
  27. Row 6 / Column 3 → 1 (Hidden Single)
  28. XY-Chain: 8 8- r7c2 -7- r9c1 -5- r9c5 -9- r8c5 -5- r8c9 -7- r2c9 -5- r3c7 -1- r5c7 -8- r5c9 -1- r9c9 -8 => r7c78,r9c2<>8
  29. Row 7 / Column 2 → 8 (Hidden Single)
  30. Row 7 / Column 8 → 7 (Hidden Single)
  31. Row 3 / Column 8 → 1 (Naked Single)
  32. Row 8 / Column 9 → 5 (Naked Single)
  33. Row 3 / Column 7 → 5 (Naked Single)
  34. Row 2 / Column 9 → 7 (Naked Single)
  35. Row 7 / Column 7 → 4 (Naked Single)
  36. Row 7 / Column 1 → 5 (Full House)
  37. Row 8 / Column 5 → 9 (Naked Single)
  38. Row 9 / Column 5 → 5 (Full House)
  39. Row 2 / Column 3 → 5 (Naked Single)
  40. Row 2 / Column 7 → 8 (Naked Single)
  41. Row 2 / Column 8 → 4 (Full House)
  42. Row 5 / Column 7 → 1 (Full House)
  43. Row 5 / Column 9 → 8 (Full House)
  44. Row 8 / Column 8 → 2 (Naked Single)
  45. Row 9 / Column 1 → 7 (Naked Single)
  46. Row 8 / Column 3 → 6 (Naked Single)
  47. Row 9 / Column 9 → 1 (Naked Single)
  48. Row 9 / Column 8 → 8 (Full House)
  49. Row 8 / Column 6 → 7 (Naked Single)
  50. Row 9 / Column 6 → 2 (Full House)
  51. Row 8 / Column 1 → 4 (Full House)
  52. Row 6 / Column 1 → 6 (Full House)
  53. Row 9 / Column 2 → 3 (Naked Single)
  54. Row 9 / Column 3 → 9 (Full House)
  55. Row 3 / Column 3 → 7 (Naked Single)
  56. Row 4 / Column 3 → 3 (Full House)
  57. Row 6 / Column 2 → 7 (Full House)
  58. Row 6 / Column 9 → 3 (Full House)
  59. Row 3 / Column 2 → 6 (Full House)
  60. Row 4 / Column 8 → 6 (Full House)
  61. Row 1 / Column 9 → 6 (Full House)
  62. Row 1 / Column 8 → 3 (Full House)
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