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

这个数独谜题有 6 个步骤，它使用 Naked Single, Locked Candidates Type 1 (Pointing), Empty Rectangle, Grouped Discontinuous Nice Loop, Give Up 技术解决。

Naked Single 解释
Locked Candidates 解释
尝试解决

解决步骤：

  1. 排 4 / 柱子 9 → 5 (Naked Single)
  2. 排 8 / 柱子 7 → 5 (Naked Single)
  3. Locked Candidates Type 1 (Pointing): 3 in b9 => r123c8<>3
  4. Empty Rectangle: 4 in b7 (r4c24) => r9c4<>4
  5. Grouped Discontinuous Nice Loop: 6 r9c1 -6- r23c1 =6= r23c2 -6- r4c2 -4- r56c1 =4= r9c1 => r9c1<>6
  6. Give Up: Don't know how to proceed!
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