怪物謎題
Arto Inkala's 2012 puzzle
11.9SE 等級
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
刊出時的原始盤面（21 個已知數）。不顯示解答。
- SE 等級
- 11.9
- 作者
- Arto Inkala
- 年份
- 2012
起源與軼事
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.
資料來源：Arto Inkala; widely reproduced in 2012 press coverage (e.g. The Telegraph, Daily Mail).
這道怪物題是如何解開的
完全用邏輯解開需要 86 步。 開局是Forcing Chain，無需猜測就能落下第一手。
其中最難的一步是Forcing Chain， 這決定了它的難度。
僅顯示技巧與次數——不涉及格子、數字或任何答案資訊。
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