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

This Sudoku Puzzle has 43 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Pair, Locked Candidates Type 1 (Pointing), Naked Triple, Uniqueness Test 2, Locked Candidates Type 2 (Claiming), Naked Pair, undefined, 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 8 / Column 9 → 6 (Naked Single)
  2. Row 1 / Column 7 → 1 (Hidden Single)
  3. Row 8 / Column 4 → 4 (Hidden Single)
  4. Row 8 / Column 3 → 9 (Hidden Single)
  5. Row 7 / Column 5 → 9 (Hidden Single)
  6. Row 9 / Column 7 → 3 (Hidden Single)
  7. Row 2 / Column 9 → 3 (Hidden Single)
  8. Row 7 / Column 2 → 6 (Hidden Single)
  9. Row 7 / Column 3 → 1 (Hidden Single)
  10. Row 9 / Column 5 → 1 (Hidden Single)
  11. Row 9 / Column 6 → 2 (Hidden Single)
  12. Row 7 / Column 4 → 5 (Full House)
  13. Row 5 / Column 9 → 4 (Hidden Single)
  14. Row 8 / Column 7 → 5 (Hidden Single)
  15. Row 8 / Column 1 → 8 (Full House)
  16. Row 9 / Column 8 → 8 (Hidden Single)
  17. Locked Pair: 7,8 in r46c4 => r13c4,r6c5<>7, r3c4,r6c5<>8
  18. Row 6 / Column 5 → 6 (Naked Single)
  19. Locked Candidates Type 1 (Pointing): 2 in b4 => r3c1<>2
  20. Locked Candidates Type 1 (Pointing): 5 in b5 => r12c6<>5
  21. Naked Triple: 5,6,7 in r235c1 => r4c1<>5, r46c1<>7
  22. Naked Triple: 5,7,8 in r259c3 => r1c3<>5, r13c3<>7, r3c3<>8
  23. Uniqueness Test 2: 1/2 in r4c19,r6c19 => r456c7,r5c8,r7c9<>7
  24. Row 7 / Column 9 → 2 (Naked Single)
  25. Row 7 / Column 7 → 7 (Full House)
  26. Locked Candidates Type 2 (Claiming): 7 in r5 => r46c2<>7
  27. Naked Pair: 4,6 in r2c67 => r2c1<>6
  28. Row 3 / Column 1 → 6 (Hidden Single)
  29. W-Wing: 5/7 in r2c1,r9c3 connected by 7 in r5c13 => r2c3<>5
  30. XY-Chain: 5 5- r1c5 -7- r1c8 -6- r5c8 -9- r5c6 -5- r5c1 -7- r2c1 -5 => r1c2,r2c5<>5
  31. Row 1 / Column 5 → 5 (Hidden Single)
  32. Row 2 / Column 1 → 5 (Hidden Single)
  33. Row 5 / Column 1 → 7 (Naked Single)
  34. XY-Chain: 6 6- r1c6 -4- r1c2 -7- r2c3 -8- r5c3 -5- r5c6 -9- r5c8 -6- r1c8 -7- r3c8 -9- r3c7 -4- r2c7 -6 => r1c8,r2c6<>6
  35. Row 1 / Column 8 → 7 (Naked Single)
  36. Row 2 / Column 6 → 4 (Naked Single)
  37. Row 1 / Column 2 → 4 (Naked Single)
  38. Row 3 / Column 8 → 9 (Naked Single)
  39. Row 5 / Column 8 → 6 (Full House)
  40. Row 1 / Column 6 → 6 (Naked Single)
  41. Row 2 / Column 7 → 6 (Naked Single)
  42. Row 3 / Column 7 → 4 (Full House)
  43. Give Up: Don't know how to proceed!
Show More...