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

这个数独谜题有 21 个步骤，它使用 Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Hidden Pair, Hidden Single, Uniqueness Test 4, undefined, Naked Single, Uniqueness Test 3, Give Up 技术解决。

Naked Single 解释
Hidden Single 解释
Hidden Pair 解释
Locked Candidates 解释
Locked Candidates 解释
尝试解决

解决步骤：

  1. Locked Candidates Type 1 (Pointing): 2 in b3 => r3c45<>2
  2. Locked Candidates Type 1 (Pointing): 9 in b4 => r789c2<>9
  3. Locked Candidates Type 1 (Pointing): 1 in b6 => r79c7<>1
  4. Locked Candidates Type 2 (Claiming): 4 in r8 => r7c45,r9c45<>4
  5. Locked Candidates Type 2 (Claiming): 5 in c6 => r4c45,r5c45,r6c45<>5
  6. Naked Triple: 3,4,9 in r9c178 => r9c245<>3, r9c459<>9
  7. Locked Candidates Type 2 (Claiming): 3 in r9 => r7c7<>3
  8. Hidden Pair: 2,4 in r4c45 => r4c45<>3, r4c45<>8, r4c45<>9
  9. 排 4 / 柱子 6 → 8 (Hidden Single)
  10. 排 6 / 柱子 6 → 5 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 3 in b5 => r6c7<>3
  12. Uniqueness Test 4: 5/9 in r4c27,r5c27 => r45c7<>9
  13. Uniqueness Test 4: 4/9 in r7c17,r9c17 => r79c7<>9
  14. W-Wing: 6/9 in r1c8,r4c9 connected by 9 in r36c7 => r3c9,r4c8<>6
  15. 排 4 / 柱子 9 → 6 (Hidden Single)
  16. 排 1 / 柱子 8 → 6 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 9 in b3 => r3c456<>9
  18. 排 3 / 柱子 6 → 3 (Naked Single)
  19. Uniqueness Test 3: 6/8 in r3c45,r7c45 => r9c45<>1
  20. Uniqueness Test 4: 2/9 in r3c79,r7c79 => r7c9<>9
  21. Give Up: Don't know how to proceed!
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