Bidirectional X-Cycle {2}

The cells {0} form a bidirectional cycle: there are exactly two ways of placing the value {1} in these cells, forming two different possible configurations. Some {1} appear in a row, column or block regardless of the chosen configuration. Because one of the two configurations must be correct, other occurances of the value {1} can be removed from these rows, columns or blocks.

The cycle is an X-Cycle because only a single value is involved. Bidirectional X-Cycles are also known as Fishy Cycles or Bilocation cycles.

The two configurations of the bidirectional cycle are enforced by two complementary, circular chains of implications. The details of each chain are given below.

Cycle details, forward direction (View 1):
{3}

Cycle details, reverse direction (View 2):
{4}