The Chess Variant Pages

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This page is written by the game's inventor, Ralph Betza.

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Azgoroth wrote on 2022-06-08 UTC

It's clear that the rules of compulsion as laid out here are not quite formal. I took my own stab at interpreting them on the page that I linked. To summarize my interpretation:

  • Every compulsion defines conditions under which it is satisfied.
  • Multiple occupancy compulsion is satisfied by moving off or destroying the piece entirely (plus some edge cases).
  • Ichor compulsion is satisfied by moving off, being pushed to a non-ichorous square, or destroying the piece entirely (plus some edge cases).
  • Ghast compulsion is satisfied by fleeing, being pushed further from the Ghast, destroying the Ghast, or destroying the piece (plus some edge cases).
  • If it's your turn and one of your pieces is compelled, you must make a legal move that satisfies at least one of your pieces' compulsions.
  • There is nothing wrong with adding new compulsions to your pieces, although this is only possible with either a Go Away's push or by a Wounded Fiend leaving a square containing another one of your pieces.

While typing this up I realized that there are a few omissions in my edge cases, which I will rectify when I get a chance. It really is tough to enumerate all the cases!

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