daj95376 wrote:Although I don't understand Sue de Coq, I've run enough SdC puzzles through my solver to notice that they often have common eliminations with a short continuous loop constrained to two boxes. I further observed this taletell pattern in many of the continuous loops.

The doubly-linked ALS xz-rule (aka ALS mutual exclusion rule) subsumes the Sue De Coq (SDC) technique ... and the distributed-disjoint-set (DDS) technique subsumes the doubly-linked ALS xz-rule.

Makes one wonder ... why all this attention currently on the SDC