魔王谜题
Arto Inkala's 2012 puzzle
11.9SE 等级
By The Hardest Sudoku Team · Last updated
8
3
6
7
9
2
5
7
4
5
7
1
3
1
6
8
8
5
1
9
4
谜题按发布时的原样呈现（21 个已知数）。不展示答案。
- SE 等级
- 11.9
- 作者
- Arto Inkala
- 年份
- 2012
起源与传说
In 2012 Finnish mathematician Arto Inkala released a puzzle he described as the hardest he had ever made — a successor to his earlier 'AI Escargot'. International press widely reported it as 'the world's hardest Sudoku'. It has no simple-technique entry point and demands long forcing chains throughout, placing it near the very top of the SE grade scale.
来源：Arto Inkala; widely reproduced in 2012 press coverage (e.g. The Telegraph, Daily Mail).
这道怪物题是如何解开的
完全用逻辑解开需要 86 步。 开局是Forcing Chain，无需猜测就能落下第一手。
其中最难的一步是Forcing Chain， 这决定了它的难度。
仅显示技巧与次数——不涉及格子、数字或任何答案信息。
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