Shusaku number
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The Shusaku number represents the "distance" between a Go player and Honinbo Shusaku, measured in Go opponents.
A person's Shusaku number can be determined, as follows:
- Shusaku himself has the Shusaku number 0.
- Any other Go player has the number 1 + the smallest Shusaku number of the player's opponents (provided at least one opponent has a Shusaku number). For example, if a player has played Shusaku himself, that player would have a Shusaku number of 1.
- For all other people, the Shusaku number is undefined.
To extend the analogy to Erdős numbers even further, one can define Shusaku numbers of the second kind to only consider players who have defeated a lower-numbered opponent. That is, only those who have beaten Shusaku would have a Shusaku number of 1, and so forth.
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