Turbot Crane

A Turbot Crane is a short single-digit chain built from two strong links connected by a weak link. Like a Skyscraper or a Two-String Kite, it guarantees that one of two remote candidates must be true, allowing eliminations outside the pattern.

A Turbot Crane alternates between strong and weak links, forming a short chain on a single digit. The two candidates at the ends of the chain are the key points of the pattern.

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At least one end of the chain must be true. Therefore, any candidate of the same digit that can see both ends would be eliminated no matter which end survives, and can be removed.

Unlike a Skyscraper or a Two-String Kite, the candidates do not form one of those recognizable shapes. The strong links may come from any combination of rows, columns, and boxes, as long as they create the same logical structure.

A Turbot Crane is therefore the general form of this deduction: a short alternating chain on one digit whose two ends jointly eliminate candidates that see them both.