PGASetPTournamentProb(3) on Linux

The text 034b550a7f36, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny) shipped it. The page shows this text now.

Specifies the probability that the string that wins a binary tournament will be selected.