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Sudoku technique · Specialty reference · reference
Continuous and discontinuous nice loops
Closed inference paths have additional deduction rules beyond an open endpoint chain. The way links meet determines the rule.
How to spot it
Start with the AIC lesson, then study a worked loop in the source.
The common mistake
A loop does not make all its nodes true; link type and continuity control the deduction.
Learn this first
AIC.
Further reading: hodoku.sourceforge.net