114,953 views
21 hours ago
317,130 views
6 years ago
672,438 views
5 years ago
248,141 views
10 years ago
Show more
677,945 views
13,182
0
Numberphile
4.48M subscribers
Tags
numberphile
Chessboard (Sports Equipment)
clones
mathematics
proof
chess
invariant
1000 Comments