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This item is a reference work
It belongs to categories: Orthodox chess, 
It was last modified on: 2006-02-26
 By Fergus  Duniho. Game Courier History. History of the Chess Variants Game Courier PBM system.[All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2017-07-03 UTC

Although Game Courier cannot fully analyze GAME Code to tell whether it fully enforces the rules of the game, I have given it the ability to more accurately estimate which presets enforce rules and which don't. One new thing that helps with this is the ability to display legal moves. When a preset has been programmed to display legal moves, it will populate an array of legal moves. So, if this array exists and has something in it, then it can display legal moves, and it very likely enforces them too. Besides checking this, Game Courier checks which code blocks are populated with code. If they're all empty, then it can be known for sure that there is no rule enforcement. If the post-move blocks are empty, odds are good that it doesn't enforce rules, and if the post-game blocks are empty, it's expected that it does not spot check, checkmate, or stalemate. One more thing is that it checks the post-game code for the strings check and stalemate. If it finds one of these in both, then it is assumed that it includes code for spotting check, checkmate, or stalemate, and this is taken as a good indication that full rule enforcement is present.

Based on this analysis, Game Courier will include a message above the board before a game begins to let you know what its capabilities appear to be. If you have programmed a game, you may bypass this and inform potential players of your preset's capabilities with even more certainty by including something like this in your pre-game code:

if == thismove null:
  say This preset enforces the rules and displays legal moves.;
endif;

By running the say command only when thismove is null, this message gets passed to it only at the beginning of the game before any moves have been made.