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Chennis. Kyoto-Shogi-inspired variant (with alternating piece sides), with a tennis theme.[All Comments] [Add Comment or Rating]
Daniel Lee wrote on 2022-01-21 UTC

Ready to be published.


Shinobi Chess. Asymmetric variant where one army has droppable Shogi-inspired pieces that start in hand.[All Comments] [Add Comment or Rating]
Daniel Lee wrote on 2022-01-21 UTC

Ready for publication


Empire Chess. Asymmetric variant where one army has pieces that move like queens but capture differently.[All Comments] [Add Comment or Rating]
Daniel Lee wrote on 2022-01-21 UTC

Ready for publication


Advanced Hexagonal Chess. Hexagonal variant that has no equal.[All Comments] [Add Comment or Rating]
Max Koval wrote on 2022-01-20 UTC

This page was recreated under its new name 'Ultimate Hexagonal Chess' (https://www.chessvariants.com/rules/ultimate-hexagonal-chess).


Chak. (Updated!) A modern vision of what a Mayan chess would look like.[All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2022-01-20 UTC

Nice! One thing I notice is that the script asks if you want to promote -- it's mandatory and not a choice.

Good point. I used the regular Shogi-style promotion supported by the Diagram, which always offers the choice. It is possible to implement mandatory promotion by supplying an additional JavaScript routine WeirdPromotion() on the page, which is a bit of a hassle. Perhaps I should support an alternative method for declaring promotion mandatory, e.g. through the already existing promoChoice parameter to the Diagram. With Shogi-style promotions this is currently not used. It would be logical to let the setting + mean mandatory promotion, and += that there is a choice. Unfortunately this is not backward compatible with Diagrams of games with Shogi-style promotion I (and others) made in the past, which often specify promoChoice as just +,  or not at all. I will give it some thought how best to make this a standard feature of the Diagram.

[Edit] OK. I fixed it by using a newly added feature of the Diagram (so only active after refresh of the browser cache): if the promoChoice string contains !L in some variant with Shogi-style promotion (i.e. promoOffset non-zero), the piece with ID L will not be allowed to defer, and will promote automatically on reaching the zone. This was inspired on the same notation being used with Chess-style promotions for indicated that the choice is not allowed on last rank. (Which is commonly used to force promotion of a Pawn there when promotion on other ranks is optional.)


Daniel Lee wrote on 2022-01-19 UTC

Nice! One thing I notice is that the script asks if you want to promote -- it's mandatory and not a choice.


Chess. The rules of chess. (8x8, Cells: 64) (Recognized!)[All Comments] [Add Comment or Rating]
Kevin Pacey wrote on 2022-01-18 UTC

Is chess [still] important? An older member of my chess club once opined in the new millennium that chess is no longer as important as before. I didn't ask what he meant. To me, chess reached its high mark in the 1970's, mainly with the Geo-political stakes involved in the Fischer-Spassky match, and later the Karpov-Korchnoi one. Chess was also important back then since it was seen as a test for AI whether a machine can beat a highly skilled human player at the game. Chess suffered to some degree because of what followed historically, in both cases.

These days, one Googles 'why is chess important' and the top answers that come up have only to do with the benefits of chess to students and/or children. Does anyone see any other meaningful reasons why chess might be viewed as important in modern times?

edit: I also posted the above on a Canadian Chess (CFC) message board. A reply by Aris Marghetis went: "If I may humbly suggest, chess serves as an inspiration: people of all kinds of differences being able to come together to compete, to create, to enjoy.

I'm not aware of any other single activity that can be played across all kinds of divisions that humanity has created, maintains, etc. Chess is universal!"


Fantastic XIII. (Updated!) A bizarre large odd chess variant with the weirdest men from Cazaux's family.[All Comments] [Add Comment or Rating]
Bn Em wrote on 2022-01-17 UTC

‘Idk’ and the others are indeed abbreviations: ‘Idk’ itself is ‘I don't know’; ‘Afaik’ ‘as far as I know’; ‘Ofc’ ‘Of course’; and ‘Iirc’ ‘if I recall correctly’.

As for trivially making up, a pawn on the central rank stops the opponent's pawn from making the same move (as that space is now occupied) and the opponent can't immediately do anything equivalent, and so has won a (potentially) better position with little effort — and since White can force this more easily than Black, the argument goes that normal pawns of an odd‐file board might give White more of an advantage. Here is the formal write‐up of Hutnik's idea, which he first proposed here, and the first few comments on Elven Chess(/Elven Shogi) also touch on it.

I seem to remember the old versions of some of your larger games (Gigachess ⁊c.) had the Ship, before you updated them. And ofc I wasn't accusing you of ‘stealing’ the ship ;) just noting that it also exists where the snaketongue was first named (I expect Eric probably got it from there, though it's certainly possible he came up with it independently).


Chak. (Updated!) A modern vision of what a Mayan chess would look like.[All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2022-01-16 UTC

Interesting variant. The following Diagram gives a good approximation. (Requires a refresh of the browser cache, to make pieces without any moves work.)

ranks=9 files=9 graphicsDir=../graphics.dir/alfaeriePNG35/ whitePrefix=w blackPrefix=b graphicsType=png squareSize=35 symmetry=rotate promoZone=5 promoOffset=8 promoChoice=!P!K maxPromote=2 royal=2 royal=10 stalemate=win counterbare=lose pawn::fsmWfcF::a3,c3,e3,g3,i3 king::K::e1 offering::-:ram:e2 shaman::FvW:guard:c1,g1 vulture::N:knight:b1,h1 serpent:R:R:rook:a1,i1 quetzal::pQ:paovao:f1 jaguar::KN:knightguard:d1 warrior::FvW:berolinapawn: divine king::Q2:falcon:

I also had to implement something for winning by reaching a target square. Such a game rule is also encountered in King of the Hill and Kahn Chess. For the moment this is handled through the routine BadZone() in a user-supplied script, (which was needed here anyway for preventing promoted pieces move back into their own half): when this function returns -1 the Diagram's standard script now interprets this as a winning move, rather than a forbidden move. Such a win is treated as baring in Shatranj, so that there is an after-move for proving the move was legal, and would declare a loss instead if it exposed royalty to capture. This again required the result of counter-baring to be specified by a parameter, (rather than always being a draw), as it should not be possible to draw here by reaching the Altar on the half-move following the one where the opponent did.


Daniel Lee wrote on 2022-01-16 UTC

Oops, I think I lost the image for that. I'll update.


Fantastic XIII. (Updated!) A bizarre large odd chess variant with the weirdest men from Cazaux's family.[All Comments] [Add Comment or Rating]
Jean-Louis Cazaux wrote on 2022-01-15 UTC

Thank you BnEm. I don't understand all what you say. English is not my mother tongue and I don't get the meaning of "Idk","afaik","ofc", "iirc" which are probably shortcuts but I don't know for what.

Also, I don't get this sentence "Otherwise a pawn reaching the middle rank has an advantage over its counterpart that can't be trivially made up for." What do you mean "trivially made up for", I'm lost.

Concerning the Ship, I used it only in my Tamerlane II, not on my other variants. Actually, I adopted it long long time ago, in the very first CV I created (and fabricated, pictures exist in https://www.chessvariants.com/d.photo/tamerlane.html), in 1978, https://www.chessvariants.com/large.dir/tamerlane2-old.html Of course in that time we had not Internet, I had no computer, it was prehistory, I was not speaking English at all, and I didn't know Betza (smile).


Chak. (Updated!) A modern vision of what a Mayan chess would look like.[All Comments] [Add Comment or Rating]
Jean-Louis Cazaux wrote on 2022-01-15 UTC

Great looking, nice thema. What I have not understood reading the rules, is how the pieces start? What is the initial setup?


Fantastic XIII. (Updated!) A bizarre large odd chess variant with the weirdest men from Cazaux's family.[All Comments] [Add Comment or Rating]
Bn Em wrote on 2022-01-15 UTC

At a first couple glances, this looks nice!

It's nice to see the Ship back again after you took it out of your mainline larger games, and ofc the snake fits logically with it. The Cheetah (aka the Beaver for those who are into Gilman) is nice too (and much rarer than the squirrel) and the Sabre‐tooth I've never seen before — it's kinda terrifying!

A couple of notes: afaik the name snaketongue (whence iirc your shortened snake) goes back to Betza's Bent Riders article — which also mentions the ship (under the name twin tower — arguably in bad taste but acknowledged as such in the original version; I think Greg accidentally(?) removed that when he added his own footnotes).

And regarding your question at the beginning, one argument for even ranks is that otherwise a pawn reaching the middle rank has an advantage over its counterpart that can't be trivially made up for. Idk if i've seen it said this way round (maybe in the comments on H.G.'s Elven Chess) but certainly there was a proposal by Rich Hutnik that on boards with odd ranks the pawn should be able to capture straight forwards to balance that advantage (by discouraging a move to the middle rank). Ofc that hasn't stopped people, and it may well matter less than it was made out to. And indeed (other than a kind of symmetry) there's nothing in particular to suggest any advantage for even files.


Mosaic Chess. (Updated!) Large variant combining pieces from various other games.[All Comments] [Add Comment or Rating]
Carlos Cetina wrote on 2022-01-14 UTC

Testing the preset of this variant using the PLAY someone at the same location resource, I got to a position that shows that there is a bug.

After the following moves

1. P g4-g6

1 ... p g9-g7

2. Z i1-g4

2 ... c g10-g9

3. Z g4-i7

3 ... c g9-g8

4. P f4-f5

4 ... a e11-i7

5. S e3-f4

5 ... a i7-d2; q-dest

6. S f4-g5

6 ... q d2-i7

7. A h2-f4

7 ... q i7-i3 // - check! -

White has only 2 moves for removing the check: 8. E j3-i3 and 8. I k3-i3

However, the first is banned by the software warning that

g4 is empty. Use your browser's BACK button to go back to the previous page, then reload if necessary. If this is your settings file, you may edit it at https://www.chessvariants.com/play/pbm/play .php? game = Mosaic + Chess & settings = mosaic & submit = Edit 

while when wanting to perform the latter, the software asks

Which piece will you promote to? 

showing a menu of 19 options, all pieces of the blue side.

EDIT: Just realized that moving 8. U j1-i3 cancels the check correctly but does not invalidate the gist of the report.


Tamerlane II. Modern variant based upon ancient large chess variant. (11x11, Cells: 121) [All Comments] [Add Comment or Rating]
Jean-Louis Cazaux wrote on 2022-01-11 UTC

Yes indeed, if I update this page I wish to keep the diagram too, it's very nice to have it. Thanks


H. G. Muller wrote on 2022-01-11 UTC

OK, I see. But the Diagram is intended as a means for practicing the variant that people have just read the rules of in the article, so I think it would be bad to surprise them with other rules. If you manage to correct the article, I will adapt the Diagram accordingly. Of course it would be better if you included the Diagram in the main page of the article; then it will not be pushed into oblivion by later discussions like this one. And then you can correct the Prince move yourself.


Shako. Cannons and elephants are added in variant on 10 by 10 board. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]
Jean-Louis Cazaux wrote on 2022-01-11 UTC

I have an idea, but maybe it will not work. This is my idea: if I write a new page for Shako as a "member submissions". Then someone just removes all contents in the existing Shako page except a link directing to the new one. Will it work?


Ben Reiniger wrote on 2022-01-11 UTC

Our old pages like this one are hard html files, whereas the new submissions ("member submissions") store their content in the database. (All the pages have indexing information in the database.)

So you can edit "member submissions" using forms that pull up the database fields, let you edit them, and then push updates to the database. But older files like this one cannot be edited from a web form. Instead, you can edit the html file itself, and an editor can upload it to the site; it isn't so much about editorializing, just the technology. (You'd have to send us the new image files too; there's another benefit to the modern member submissions: we've added file upload scripts.)

In my previous post I started to think about how to migrate an old style page to the new format. If Fergus and Greg think it's not unreasonable we might try that. When I have time I'll give it a try on our dev/backup site.


Tamerlane II. Modern variant based upon ancient large chess variant. (11x11, Cells: 121) [All Comments] [Add Comment or Rating]
Jean-Louis Cazaux wrote on 2022-01-11 UTC

Exact HG, I had not realized that. This is the consequence of the fact that I can't edit this page like I do with my other games. (I have the same problem with Shako).

This page on our site is not updated. The updated page is here http://history.chess.free.fr/tamerlane2.htm

If I could I would update the page on CVP too. I could then explain why this evolution.


H. G. Muller wrote on 2022-01-11 UTC

I was looking to this Interactive Diagram (thanks HG). The Prince's move is not correct. It is not K. It should be KimfnD.

The description in the page says K, so that is what I use in the Diagram.


Shako. Cannons and elephants are added in variant on 10 by 10 board. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]
Jean-Louis Cazaux wrote on 2022-01-10 UTC

Ben, why not giving me the right to edit the page to make it simple? If I can edit the pages of my other variants why not editing Shako? If we do this way, no links will be lost. If for any reason my new edition wouldn't satisfy you or other editors, it would always be possible for you to restore the previous version.

I think Shako would deserve a better page with better graphics.


Ben Reiniger wrote on 2022-01-10 UTC

You can certainly edit the html file and send it to an editor to re-upload. To migrate it to a member submission would be nicer, but harder; if we created a member submission page and could attach the current itemID I think it would correctly assign favorites, comments, etc., but I'm not sure if lacking the MS prefix of a member submission would break anything? There are surely also absolute links to this page, so we'd need a redirect, but that's no problem.


Jean-Louis Cazaux wrote on 2022-01-09 UTC

I wish I could edit this page to present it in a better manner, and consistently with my other variants. Is that possible?


Tamerlane II. Modern variant based upon ancient large chess variant. (11x11, Cells: 121) [All Comments] [Add Comment or Rating]
Jean-Louis Cazaux wrote on 2022-01-08 UTC

I was looking to this Interactive Diagram (thanks HG). The Prince's move is not correct. It is not K. It should be KimfnD.


Microorganism Chess. A 16x16 board with pieces that behave like micro-organisms. (16x16, Cells: 256) [All Comments] [Add Comment or Rating]
Walker wrote on 2022-01-07 UTC

Maybe we could speed the game up a bit by making some pieces slightly faster and, like the Drunken Nights of CwDA, tone down the White Blood Cell a bit.


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