![]() Of my 100 puzzles, 45 are solved in this way. (3) Strong links required to be within the same cell, weak links required to be between different cells - xy_chain. Of my 100 puzzles, 89 are solved this way. (2) Strong links can be either between different cells or within the same cell, weak links can also be either between different cells or within the same cell - alternating inference chain. In the database of 100 puzzles I am using, 60 are solved this way. (1) Strong links required to be between different cells, weak links also required to be between different cells - original "nice loops". We get three of the strategies described at this website by using different definitions for strong and weak links. We can define links in two ways - they can be between the same value in two different cells in the same row, column, or box, or they can be between different values within the same cell. Thought about this one, it seems to be a somewhat strange special case of alternating inference chains.
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