Loop

A loop is a cyclic pattern of linked cells or candidates.

Loops are usually represented by chains, where the first and the last cell are the same. Like a chain, implications in a loop can either travel in a single direction or in both directions. A bidirectional loop is better known as a Nice Loop.

Examples of loops are:

• Turbot Fish
• Fishy Cycle
• XY-Ring
• XY-Cycle
• Nice Loop

Notation systems are similar to chain notation, with Nice Loop notation especially designed for loops.