Ratings & Comments

I think one thing the author may do until when and if this variant gets formally published here is to make a Zillions of Games implementation of it, then send an email to Ed van Zon to get the implementation published. There can be a long delay before a submission and its publication here, but Ed’s pretty good about publishing a submission within a week of its submission.

The hard part is taking all these rules and converting them in to Zillions’ quirky language. I enjoy doing it myself; it converts rules in to unambiguous machine-readable rules, and it allows people to play the variant themselves.

I would also change the name of the summoned pieces in to something like, oh, Dragon Horse and Dragon King, the Anglicized form of these pieces’ names in Shogi. I like the summoning tactic, but it’s an open question whether having it makes the White advantage overwhelming. People seem to enjoy Crazyhouse a lot over at Lichess, so I think this summoning mechanic can be very usable.

(I should also point out that Betza called what is the Jester here the “Waffle”)

Zillions of Games is a commercial program, and not everyone has it. It is a pity the AI of the Interactive Diagram doesn't do drop moves yet. In general variants with drop moves (such as Shogi) are very hard for a computer, because of the huge branching factor. In this case drops (for summoning Demons) are limited to just a few squares adjacent to the Mages, while most of the time there wouldn't be anything to drop because the Demons are already in play. Implementing the Demon summoning as a regular drop, which would try any square, and rely on a user-supplied BadZone routine to reject any drop that doesn't land adjacent to a Mage would still be a very inefficient implementation, though.

I guess it would be possible to abuse the XBetza 'unload' modifier u for summoning. Currently this is defined as putting the piece that was captured by the move at the origin square of the leg that it labels. But a back-and-forth move where the second leg unloads (e.g. abuK) would never capture anything, as it would end where the piece itself was (and the first leg per default has m mode). But if the Diagram's AI would simply ignore the u in such a case, effectively making it a turn pass, a user-supplied routine WeirdPromotion could be used to specify a new piece for the unload square rather than the overall destination of the move. Promotion choices are automatically taken from the 'hand' already (to implement promotion-to-captured-only). This would then selectively generate drops on squares adjacent to the pieces capable of summoning (which have the abuK move component specified on them).

While H. G. Muller and Jean-Louis Cazaux have qualified their criticisms by saying they are not editors, they are among the regular contributors who are most qualified to be editors, and their criticisms are valid. This page needs to be fixed up a lot, and I will wait for appropriate changes to be made before publishing it.

I will also note that some people would have religious objections to pieces with demonic names. When Hans was running this site, he would not allow some Shogi variants that included demon pieces. While I don't share his religious beliefs, and I assume Japanese demons are not quite the same thing as Christian demons, I see more of a problem with a game that allows for summoning demons in the more usual western sense. I will also point out that the pieces called Demon and Demoness are more commonly known as Dragon King and Dragon Horse, these being the names they have in Shogi.

I will also note that some people would have religious objections to pieces with demonic names. When Hans was running this site, he would not allow some Shogi variants that included demon pieces. While I don't share his religious beliefs, and I assume Japanese demons are not quite the same thing as Christian demons, I see more of a problem with a game that allows for summoning demons in the more usual western sense. I will also point out that the pieces called Demon and Demoness are more commonly known as Dragon King and Dragon Horse, these being the names they have in Shogi.

I am a Christian but I see no real problem with these names.  I do think Dragon King and Dragon Horse are better names, both because they are established and because they are less likely to offend, but if the author wants to stay with Demon and Demoness, I don't personally think that is a sufficient issue to veto publication.  It is, after all, a game.  (And one of my own inventions would be problematic!  I now notice that page doesn't have the introduction where I described the origin of the name and the theme of the game -- an M. C. Escher drawing called Circle Limit IV -- I was working on that game and apparently never finished the rewrite...)

The Diagram below implements summoning for entering user moves. (The AI doesn't understand it yet.) It appears I had already built in some provisions to promote a piece on a locust square through the user-supplied WeirdPromotion routine: if the '256' bit of the promotion piece that is returned by the function was set, it doesn't promote the piece on the destination, but the piece on the locust square. I still had to fix some bugs in relation to handling of the pieces in hand, though. (Swapping with a piece increased the number of pieces in hand, and promoting at the locust square did not decrease it.) So refresh your browser cache!

In this Diagram there is one unorthodox piece, the Lady. It moves and captures like a Rook, but it can also swap with friendly pieces that are a Rook move away. In addition it can summon a Queen on an adjacent square, if you have one in hand. (And initially you do have one!) To do that just move the piece to such a square, and then back. A second click on an adjacent square would move the the piece there, rather than summoning.

The Pieces section is slightly awkward to read since the promoted forms sometimes show up before the unpromoted pieces and they aren't arranged in any obvious pattern.

OK, I cured this by sorting the piece descriptions from weak to strong, and by putting the promoted versions near the end. For each unpromoted piece it now also mentions what it promotes to.