H. G. Muller wrote on Fri, Nov 19, 2010 10:17 AM UTC:
Well, If you want to get humiliated, you can always play against SMIRF or Joker80. (The latter is included in the standard WinBoard install, when you select the variantist option during install.)
If you want a challenging, but beatable opponent, try Fairy-Max (also included in the WinBoard standard install, obtainable from WinBoard forum).