Tag Archives: uniqueness

Another Look at Ardson Very Hard v.2 38


This post brings up an interesting question about the multiple solution puzzle: Does its ambiguity prevent strictly logical solving from reaching a solution? Introducing the first selected review puzzle of the A.D. Ardson Very Hard v.2 collection on April 11, … Continue reading

Posted in Advanced Solving | Tagged , , | 6 Comments

THLS Limps In On Chains


This post identifies the conjugacy chain, the last fundamental chain type to be introduced in The Hidden Logic of Sudoku, as a weakened X-chain.  Since the last few chapters introduce extensions for XY chains, it becomes clear that THLS is … Continue reading

Posted in Advanced Solving, Berthier | Tagged , , , , , , , , , , | 2 Comments