Interesting!

I'm reminded of the #Powerup-Zone tag, but this doesn't fit there. There's also Lumberjack which is sort of a simpler version of this, and of course Smess.

I've taken a stab at clarifying the 64+16 rule, please check that it is what was intended. I also cleaned up grammar in a few places (though it looks like someone else had a pass a the same today?).

Marsellais chess has a rule where each player moves 2 pieces in the same turn. Castling is considered a single move. All other castling rules apply.

I'm wondering what the number of moves played in an average game of Chinese Chess would be (for comparison, I've seen 40 or 42 moves given for FIDE Chess). Does anyone know?

What about 'Chess66'? Do you want to publish it - or possibly not and why not? If you don't want to continue with 'Chess66', then it won't work with 'Chess69' either. Anyway, then try the variant 'Avatar Chess' , which I think is programmable. Thanks in advance.

I wouldn't switch courier and knight. The charm is to respect the historical setup of Courier chess. That position for the knight, next to the rook is not unusual to my eyes.

i think it does, and considering its been up for 20 years i think its doing good work.

Just noticed this comment. Apparently Old Shatar actually starts with the pawns on the 2nd and 7th ranks. 1. d4 d5 is mandatory first move. Since Old Shatar did not actually have the Hia, I wanted to keep the game as close as possible to the original but, of course, add a Hia. Your idea, of course, is good. I did add a game in a comment, as an example game. I think the checkmate is very nice.

I'd suggest to move the link to your blog into this page, and delete the external link page.

You don't say here, but from playing one of the versions linked in your blog, it appears the same piece can be moved multiple times. That's worth saying explicitly, since that is one of the main things that differentiates some multi-move variants.

Undertaker

The description of the Undertaker says it promotes to the Knightrider. I believe this is incorrect -- judging from the description of the Knightrider and the Dayrider, it should say the Undertaker promotes to the Dayrider.

Edited regarding letters: Berolina pawns changed from P to Q.

It appears the CVP website has been switched from http to https. Since the piece images are on my own website, which is http, the browser now refuses to display them.

In this case I can easily fix it, because the same piece set probably is somewhere on the CVP website, and if not, can be uploaded as user graphics. But the same problem will now manifest itself in other places. In particular, the 'Diagram Editor with Scalable Graphics' will be broken. This refers to a C program on my own website thar dynamically generates piece images according to specification, and now also is no longer accessible. So far Fergus did not manage to compile the same program for the CVP website, so that it could run there.

[Edit] Interesting. On my PC with FireFox all this works. Perhaps I have switched off this pedantic security feature there; I don't really remember.

I think this is unlikely. I have never seen the Edo-era description of Tenjiku Shogi, but I do know how such descriptions looked in general. They basically showed a drawing of the initial position, where each square contained a drawing of the way the piece moved, with the kanji of the piece name in the center. Sliding moves would just be radial lines, and it would be immediately clear whether the Lion Hawk also had orthogonal slides.

Only complex moves, such as the Lion, would not be obvious from the drawing, and would be described by an additional line of text. I once have seen the picture for the Teaching King (a piece from Maka Dai Dai Shogi); it had lines in 8 directions, each with 3 perpendicular line segments crossing it for indicating the multi-captures of teh Lion Dog. (And the text line then said it would move like Queen or Lion Dog.)

The setup has changed a lot !

There is nothing 'unknown' about the set of prime numbers; it is in fact very well known that there is no such thing as a 'complete' set of them, as the set is infinite. There exist simple (albeit inefficient) algorithms to determine for any given number whether it is prime or not.

It is also a misconception that the presence of a Huygens would make a game unsolvable due to the properties of primes or any other of its properties. E.g. it is very easy to prove a game with a starting position of King + 2 Queens vs King + Huygens on an infinite board is won for the Queens. It is even possible to give a detailed algorithm for how to do this, in a number of moves that only grows logarithmically with the distance between the Huygens and the Kings. If the Huygens has the first move, this number can of course be made arbitrarily large, by moving the Huygens far away after it runs out of safe checks (because the King approached it).

All this would still be true if the Huygens was a Rook, rather than a subset of it.