Pattern Coverage

A row is deducible when at least one empty cell can be determined from its constraints alone, without information from crossing lines.

Of the 6-cell rows, 22,748 are deducible. Every one of them is covered by at least one of the 13 named patterns (5 basic, 8 compound). The table below shows how many deducible rows each pattern matches. Rows often match more than one pattern, so percentages sum to well over 100%.

These numbers reflect how many possible row configurations each pattern can match. They do not reflect how often each pattern appears in actual puzzles. Puzzle designers choose constraints deliberately, and harder puzzles tend to require the less common patterns.