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

This Sudoku Puzzle has 36 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), undefined, Turbot Fish, Uniqueness Test 4, Locked Candidates Type 2 (Claiming), AIC, Full House, Give Up techniques.

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

Solution Steps:

  1. Row 5 / Column 7 → 4 (Naked Single)
  2. Row 5 / Column 9 → 5 (Naked Single)
  3. Row 1 / Column 9 → 7 (Hidden Single)
  4. Row 5 / Column 5 → 6 (Hidden Single)
  5. Row 4 / Column 3 → 5 (Hidden Single)
  6. Row 9 / Column 4 → 3 (Hidden Single)
  7. Row 9 / Column 6 → 5 (Hidden Single)
  8. Row 3 / Column 5 → 5 (Hidden Single)
  9. Row 6 / Column 8 → 1 (Hidden Single)
  10. Row 8 / Column 9 → 4 (Hidden Single)
  11. Row 8 / Column 5 → 7 (Hidden Single)
  12. Row 3 / Column 8 → 4 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 2 in b4 => r4c5<>2
  14. Locked Candidates Type 1 (Pointing): 1 in b5 => r4c12<>1
  15. 2-String Kite: 8 in r3c1,r7c8 (connected by r2c8,r3c9) => r7c1<>8
  16. Row 8 / Column 3 → 8 (Hidden Single)
  17. Turbot Fish: 6 r3c2 =6= r3c6 -6- r8c6 =6= r7c4 => r7c2<>6
  18. Uniqueness Test 4: 1/4 in r2c45,r4c45 => r2c45<>1
  19. Locked Candidates Type 1 (Pointing): 1 in b2 => r1c23<>1
  20. Locked Candidates Type 2 (Claiming): 1 in c2 => r7c1<>1
  21. Uniqueness Test 4: 1/9 in r2c13,r5c13 => r2c13<>9
  22. Finned X-Wing: 9 c29 r37 fr1c2 => r3c1<>9
  23. AIC: 6 6- r2c8 -8- r7c8 =8= r7c9 =9= r3c9 -9- r2c7 =9= r2c5 -9- r6c5 -2- r6c6 =2= r8c6 -2- r8c7 -6 => r12c7,r79c8<>6
  24. Row 9 / Column 8 → 7 (Naked Single)
  25. Row 7 / Column 8 → 8 (Naked Single)
  26. Row 2 / Column 8 → 6 (Full House)
  27. Row 7 / Column 9 → 9 (Naked Single)
  28. Row 2 / Column 3 → 1 (Naked Single)
  29. Row 5 / Column 3 → 9 (Naked Single)
  30. Row 5 / Column 1 → 1 (Full House)
  31. Row 7 / Column 4 → 6 (Hidden Single)
  32. Row 7 / Column 1 → 7 (Hidden Single)
  33. Row 9 / Column 1 → 9 (Hidden Single)
  34. Row 4 / Column 1 → 2 (Hidden Single)
  35. Row 4 / Column 2 → 3 (Full House)
  36. Give Up: Don't know how to proceed!
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