Use this code in the rubywarrior/warrior_name-level/player.rb
file, ie:
john-beginner/player.rb
charly-intermediate/player.rb
run rubywarrior like this to avoid selecting the warrior every time:
$ ./bin/rubywarrior -d rubywarrior/john-beginner
or
$ cd rubywarrior/john-beginner
$ ../../bin/rubywarrior