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Monthly Archives: January 2017
A Chicken Chok’in Checkpoint on Unhidden Chains
This post checkpoints Royle 17-16774, a rare example in The Hidden Logic of Sudoku of conjugacy chains dealing with a monster cloud of candidates. The checkpoint also catches SudoRules dismembering a “useless” XY nice loop that somehow sneaked into THLS. … Continue reading
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 c-chains, color wrap, Denis Berthier, near BUG, nice loop, remote pair, Reverse XY chains, swordfish, The Hidden Logic of Sudoku, uniqueness, X-chains
2 Comments
Remaining THLS XV hXY Avoided
Here we complete the report on the puzzles selected in The Hidden Logic of Sudoku to show that hidden XY chains are an “inescapable tool for the advanced player”, and therefore require the generation and maintenance of symmetry grids. None … Continue reading
No THLS Case for Hidden XY Chains
This post and the next demonstrate that the examples presented in The Hidden Logic of Sudoku as requiring “Hidden” XY Chains actually have alternative, and much less demanding, resolution paths in the Sysudoku repertoire. The burdensome maintenance of symmetry grids is … Continue reading
Hidden XY Chains Are Reverse XY AIC
This post demonstrates that every hidden XY chain has a recognizable AIC counterpart on the normal grid, nrc space. That means it is not necessary, if you are AIC literate, to generate and maintain the grid spaces in which hXY … Continue reading
Systematic Sudoku 