Zillions-of-Games is mentioned as a minimal way of meeting this requirement, because it is the most convenient option for someone to get his game programmed for play against a fairly strong computer opponent. For a small cost, which is currently whatever you want to donate, because it is no longer being sold commercially, you can get a key that unlocks the free Zillion-of-Games demo. With the unlocked demo, someone with some programming skill can program his own game. However, I did mention that it is not the only option. So if a game is programmed for ChessV or Fairy-Max, that’s going to count too. It’s just that for these programs you’re more at the mercy of the developer and can’t so easily do it yourself. It’s also going to count if you do a program in some more general-purpose language like C or C#. For most people though, this option will be more difficult or require the much greater cost of hiring a programmer to do it for you. So I mentioned the easiest option first but did not rule out other options.
Zillions-of-Games is mentioned as a minimal way of meeting this requirement, because it is the most convenient option for someone to get his game programmed for play against a fairly strong computer opponent. For a small cost, which is currently whatever you want to donate, because it is no longer being sold commercially, you can get a key that unlocks the free Zillion-of-Games demo. With the unlocked demo, someone with some programming skill can program his own game. However, I did mention that it is not the only option. So if a game is programmed for ChessV or Fairy-Max, that’s going to count too. It’s just that for these programs you’re more at the mercy of the developer and can’t so easily do it yourself. It’s also going to count if you do a program in some more general-purpose language like C or C#. For most people though, this option will be more difficult or require the much greater cost of hiring a programmer to do it for you. So I mentioned the easiest option first but did not rule out other options.