Tengen plus mane-Go, part 1
Go Seigen tried this strategy once in 1929
(Go Seigen's Progress series sponsored by Jiji Shinpo).
His opponent Kitani Minoru (White) was very angry, because Go played mane Go till
W's move #64! Kitani won that game by 3 point, but later lot of
professionals said that it's very rude for B to use such strategy.
It's not a rare thing on Go servers.
Here is the first example: 40 moves long mane Go, based on tengen