# Zachary's Karate Club

The most famous small network in science. 34 club members, 78 friendships, and a fight that split the club in two.

Source: https://netgraf.isik.co/m/zachary-karate-club
Kind: Real
Summary: 34 people, 78 relationships
Structure: average 4.6 connections each, 14% of the possible ties drawn, 4 communities

## People (34)

- Mr. Hi, Karate instructor
- Member 2, Went with Mr. Hi
- Member 3, Went with Mr. Hi
- Member 4, Went with Mr. Hi
- Member 5, Went with Mr. Hi
- Member 6, Went with Mr. Hi
- Member 7, Went with Mr. Hi
- Member 8, Went with Mr. Hi
- Member 9, Went with Mr. Hi
- Member 10, Stayed with John A.
- Member 11, Went with Mr. Hi
- Member 12, Went with Mr. Hi
- Member 13, Went with Mr. Hi
- Member 14, Went with Mr. Hi
- Member 15, Stayed with John A.
- Member 16, Stayed with John A.
- Member 17, Went with Mr. Hi
- Member 18, Went with Mr. Hi
- Member 19, Stayed with John A.
- Member 20, Went with Mr. Hi
- Member 21, Stayed with John A.
- Member 22, Went with Mr. Hi
- Member 23, Stayed with John A.
- Member 24, Stayed with John A.
- Member 25, Stayed with John A.
- Member 26, Stayed with John A.
- Member 27, Stayed with John A.
- Member 28, Stayed with John A.
- Member 29, Stayed with John A.
- Member 30, Stayed with John A.
- Member 31, Stayed with John A.
- Member 32, Stayed with John A.
- Member 33, Stayed with John A.
- John A., Club president

## Relationships (78)

- Mr. Hi and Member 2: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 3: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 4: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 5: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 6: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 7: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 8: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 9: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 11: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 12: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 13: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 14: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 18: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 20: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 22: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Mr. Hi and Member 32: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 2 and Member 3: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 2 and Member 4: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 2 and Member 8: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 2 and Member 14: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 2 and Member 18: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 2 and Member 20: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 2 and Member 22: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 2 and Member 31: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 3 and Member 4: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 3 and Member 8: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 3 and Member 9: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 3 and Member 10: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 3 and Member 14: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 3 and Member 28: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 3 and Member 29: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 3 and Member 33: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 4 and Member 8: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 4 and Member 13: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 4 and Member 14: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 5 and Member 7: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 5 and Member 11: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 6 and Member 7: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 6 and Member 11: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 6 and Member 17: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 7 and Member 17: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 9 and Member 31: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 9 and Member 33: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 9 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 10 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 14 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 15 and Member 33: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 15 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 16 and Member 33: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 16 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 19 and Member 33: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 19 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 20 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 21 and Member 33: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 21 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 23 and Member 33: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 23 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 24 and Member 26: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 24 and Member 28: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 24 and Member 30: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 24 and Member 33: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 24 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 25 and Member 26: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 25 and Member 28: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 25 and Member 32: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 26 and Member 32: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 27 and Member 30: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 27 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 28 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 29 and Member 32: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 29 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 30 and Member 33: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 30 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 31 and Member 33: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 31 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 32 and Member 33: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 32 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]
- Member 33 and John A.: friends outside the club (social, confirmed) [source: https://en.wikipedia.org/wiki/Zachary%27s_karate_club]

## Tour (5 steps)

1. A university karate club in the early 1970s. Wayne Zachary recorded who spent time with whom outside class.
2. Mr. Hi taught the classes. He wanted to raise the price of lessons.
3. John A. ran the club and said no. Members started taking sides.
4. Mr. Hi was fired and started a new club. Purple went with him. Amber stayed.
5. Zachary used only these friendships to guess who would go where. He got everyone right except member 9.

## Sources

- https://en.wikipedia.org/wiki/Zachary%27s_karate_club