专家 外部数独
网格外部的提示数给出在该行或列中遇到的前三个数字——但不包括它们的顺序。
专家 外部数独。这是网站上最难的谜题——每个数字的放置都来自跨边界和宫约束的精确逻辑推理。无需猜测。
2
3
9
3
4
1
9
7
4
9
2
6
5
3
9
9
3
6
7
9
6
3
2
5
8
8
7
7
3
1
2
8
1
5
4
2
3
1
9
7
8
6
8
7
6
4
3
6
9
5
8
6
7
4
3
7
2
3
5
什么是外部数独？
难度
★★★☆☆
3/5
约束类型
外部线索
典型给定数
28–36 given + 4×9 outside clues
平均解题 (专家)
65 分钟
专家 级别的解题技巧
| 技巧 | 描述 | 级别 |
|---|---|---|
| Clue-Zone Mapping | Each outside digit must appear in the nearest 3 cells of its row or column. Map all outside clues to their zones immediately. | 初级 |
| Cross-Side Reasoning | If left clue digit X must be in cols 1–3, and right clue digit X is in the same row, that row already places X — the other side confirms its column. | 中级 |
| Box-Side Interaction | An outside clue for a row interacts with the box containing cols 1–3. If the row's box is heavily constrained, the outside digit's position may be forced. | 中级 |
| Digit Elimination from Clues | When a clue digit is placed in the zone, eliminate it from the rest of the zone row/col using standard Sudoku logic. | 中级 |
| Dual-Side Chains | Combine left and right clues for the same row: both digits restrict the same three columns from opposite ends, leaving the middle box fully determined. | 高级 |
在专家需要掌握的技巧
- X翼技巧 — Expert outside grids under-clue the borders, so window logic alone stalls — fish on digits that appear in many clues, since their global positions are the most constrained.
- Swordfish technique — Three rows whose windows trap the same digit in matching columns set up a Swordfish — the standard escape from an expert outside-clue deadlock.
按难度划分的平均解题时间
简单
8 分钟
中等
18 分钟
困难
36 分钟
专家
65 分钟
想要规则、策略和解题步骤的完整指南吗？
如何玩外部数独 →
相关变体
摩天楼数独
The next step in border-clue logic — outside numbers become visibility counts that constrain entire row orderings.
三明治数独
Border clues with arithmetic teeth: each one is the sum of the digits trapped between 1 and 9.
杀手数独
Moves the clue layer inside the grid as summed cages — a natural graduation from window placement to sum deduction.
常见问题 — 专家 外部数独
更多问题？请参阅完整 外部数独指南.