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Chess 1010. Game played with 40 pieces. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]
David Paulowich wrote on 2023-01-30 UTC
diagram

DIAGRAM WITH REDUNDANT ROOKS

Here's an alternate setup, similar to TenCubed Chess. The Archbishop (e1) defends the Knight (c2) which protects a Pawn (a3) and a Rook (a1). After the Knight has moved, the Archbishop may take its place on (c2). The Chancellor has much the same story. Note that the Queens are now on their own colors. My personal preference is placing the Rooks on the second rank and something exotic - like Cannons - in the corners. With your Rooks in the corners, you are free to try new pieces on (b2) and (i2). Silver Generals would provide a rock solid defence of the Pawns - perhaps too solid.


Interactive diagrams. (Updated!) Diagrams that interactively show piece moves.[All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2023-01-29 UTC
satellite=burn files=8 ranks=8 promoZone=2 maxPromote=3 promoOffset=6 royal=6 graphicsDir=/graphics.dir/alfaeriePNG/ squareSize=50 graphicsType=png lightShade=#ffff80 darkShade=#bf998c rimColor=#077208 coordColor=#ffff40 borders=0 firstRank=1 useMarkers=1 newClick=1 trackPieces=1 atomicCapture=0 pawn::::a2-h2 bishop::::c1,f1 rook::::a1,h1 knight:N:::b1,g1 queen::::d1 king::::e1 steward::mWcF:: horse::BW:promotedbishop: dragon::RF:promotedrook:

This Diagram lets the Queen burn both actively and passively. It uses trackPieces=1 to track the Queen, so WeirdPromotion() can efficiently get her location, and mark the adjacent squares as the burn zone, to destroy all pieces that land there.

(Refresh the browser cache, as there was a bug in the standard script w.r.t. kamikaze moves: these did set the 'non-virgin' flag on the resulting empty square, so the Diagram would treat it as an invisible white piece rather than an empty square. For now I solved that by making all pieces resulting from promotion virgin. Which is of course incorrect, but much less harmful.)


Riftwalker Chess. Hidden A 4 dimensional game on a 3x3x3x3 board. (3x(3x(3x3)), Cells: 81) [All Comments] [Add Comment or Rating]

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Stone's Chess. Hidden Two archbishop variation. (8x10, Cells: 80) [All Comments] [Add Comment or Rating]

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Riftwalker Chess. Hidden A 4 dimensional game on a 3x3x3x3 board. (3x(3x(3x3)), Cells: 81) [All Comments] [Add Comment or Rating]

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Home page of The Chess Variant Pages. Homepage of The Chess Variant Pages.[All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2023-01-29 UTC

Yes, I was thinking that we no longer need the quickedit script. It was made back when I was still accessing the site through dial-up. Now that we're all using broadband, dial-up speeds are no longer a bottleneck. Besides that, I have since reduced the size of the edititem script by replacing four separate but identical drop-down lists with a single datalist that gets used by four different fields.


Tenjiku Shogi. Fire Demons burn surrounding enemies, Generals capture jumping many pieces. (16x16, Cells: 256) [All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2023-01-29 UTC

Indeed, a user promotion choice does overrule everything else. If a fixed promotion is required for pieces that would offer choice, the promotion query should be suppressed. Not only because it would prevail, but because it makes no sense at all to let the user choose and then do something else.

The mechanism the Diagram uses for this is to call WeirdPromotion() with the promo parameter set to 1021 (which is not a valid piece type), to inquire whether there is promotion choice. When this call returns 1001 the query will be suppressed, when it returns 1000 a query is forced, and in any other case it decides itself (based on maxPromote, promoZone and promoChoice).

In the AI it works slightly different; there (for a piece that could normally promote) WeirdPromotion() is called with promo equal to the promoted piece (as per promoOffset), and to suppress the promotion this would have to return 1022. It is the deferral (promo=0) that must be turned into a kamikaze move by returning 251, so that moves that would not naturally promote also get burned.

So when a passive burn is detected, WeirdPromotion() should return 1001 if promo == 1021, 251 if promo == 0 and 1022 otherwise.

 


Apothecary Chess-Modern. Large board variant obtained through tinkering with known games.[All Comments] [Add Comment or Rating]
Aurelian Florea wrote on 2023-01-29 UTC

@Fergus Have you any idea about what is going on!


Fighting Chess. A reform to Chess that eliminates stalemate and strengthens some of the pieces.[All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2023-01-29 UTC
I consider every deviation from the orthodox rules proposed here a deterioration...

David Paulowich wrote on 2023-01-29 UTCPoor ★
"This rule gets rid of zugzwang." 
 
More than sixty years ago I learned how to use zugzwang to win with King and Rook against the lone King. So how does Tony Berard deal with this problem? 
 
"The rooks, bishops, and knights now also move and capture like a king." 
 
Sixteen years ago I commented on Ultra Chess (by Ruggero Micheletto).  Here is a question for both authors.  Is the endgame King and Rook versus King and Knight even more likely to lead to a draw in your chess variants?

Infinite Chess 3D. Extends Chess to larger, even infinite, boards. () [All Comments] [Add Comment or Rating]
Ben Reiniger wrote on 2023-01-29 UTC

No, rules 2-3 means that pieces cannot move from one "domain" to another except as in a 4d (asymmetric) game.

But it does look like I may have been wrong about the title: the domains are each infinite, while apparently the domains are supposed to be limited to an 8x8 grid.


4D Hexagonal Chess. 4D analogue of Glinski's Hexagonal Chess based on Hyperchess4. (5x(5x(5x5)), Cells: 361) [All Comments] [Add Comment or Rating]
Kevin Pacey wrote on 2023-01-29 UTC

Fergus wrote:

"... it looks like this game has 5 ranks, 5 files, 5 3D rows or levels, and 5 4D columns or realms."

Yes, I suppose it could be put that way.


Mansindam (Pantheon tale). (Updated!) A variant that combines 'drop' rule and strong pieces, and there is no draw. (9x9, Cells: 81) [All Comments] [Add Comment or Rating]
Daphne Snowmoon wrote on 2023-01-29 UTC

I'm thinking of making Masindam puzzles soon !


Home page of The Chess Variant Pages. Homepage of The Chess Variant Pages.[All Comments] [Add Comment or Rating]
Ben Reiniger wrote on 2023-01-29 UTC

I cannot use the item quick-edit script (as an editor) because the form does not have the new BoardRealms input (though perhaps the quick edit can be deprecated now that the author list population isn't so slow), and the database apparently won't allow it to be null. Again, I really think allowing nulls for non-game items would be best, and BoardRealms should be defaulted to 1 in any forms.


Riftwalker Chess. Hidden A 4 dimensional game on a 3x3x3x3 board. (3x(3x(3x3)), Cells: 81) [All Comments] [Add Comment or Rating]

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4D Hexagonal Chess. 4D analogue of Glinski's Hexagonal Chess based on Hyperchess4. (5x(5x(5x5)), Cells: 361) [All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2023-01-28 UTC

When representing a 4D game in two dimensions, which is what we're limited to on a computer screen, it makes sense to pair together a higher-dimensional label with a lower-dimensional one. This is especially so with something like Game Courier, which gives you only files and ranks to work with. This can lead to a coordinate like Dc23, which I hovered over randomly, which transposes the second and third dimensions. Bearing that in mind, it looks like this game has 5 ranks, 5 files, 5 3D rows or levels, and 5 4D columns or realms.


Tenjiku Shogi. Fire Demons burn surrounding enemies, Generals capture jumping many pieces. (16x16, Cells: 256) [All Comments] [Add Comment or Rating]
Adam DeWitt wrote on 2023-01-28 UTC

I also experienced this bug with contagious promotions. It seems the shogi promotion prompt is suppressing the WeirdPromotion result.


H. G. Muller wrote on 2023-01-28 UTC

Indeed, when WeirdPromotion() is used to pieces that would also promote otherwise it involves more than just returning the desired promotion piece. The Diagram makes a special call to it (recognizable by promo = 1021) to inquire whether there might be promotion choice, and in the passive burning case this should be used to suppress the choice that maxPromote and promoZone would suggest. I don't think the current version does this entirely correct for Shogi promotions, though. I will have a look at it tomorrow.


4D Hexagonal Chess. 4D analogue of Glinski's Hexagonal Chess based on Hyperchess4. (5x(5x(5x5)), Cells: 361) [All Comments] [Add Comment or Rating]
Kevin Pacey wrote on 2023-01-28 UTC

I edited my previous comment, for any who missed it.


Fergus Duniho wrote on 2023-01-28 UTC

4d games are rare enough that I wouldn't have bothered to add a database column.

Since I was adding code to the footer to indicate a board's dimensions, it seemed more appropriate than treating them as 3D games.

It will probably cause confusion for new authors.

I have added tooltips to the Edit Item form, and if there are other forms they should be added to, I can do that. I have also used parentheses to make it clearer what the dimensions of a board refer to. For 3D boards, a single pair of parentheses go around the files-by-ranks part, and levels goes on its left. For 4D boards, another pair of parentheses goes around the 3D board dimensions, and the 4th dimension goes on the left. The convention I'm following places increasing dimensions on the left, and it treats the number of ranks as the first dimension. This is because in the typical Chess variant, the board has two sides, and each player starts with all his pieces on one side. So, the distance between two sides would be the number of ranks. The second dimension, the number of files, is about how much space each side has to spread out its forces. Since we normally write files before ranks in algebraic notation, it makes sense to add higher dimensions to the left side. Also, this was the convention followed in some 3D games I looked at last night. And it's also sort of how Arabic numerals work. The leftmost digit in a numeral has a higher value than those to the right.


Infinite Chess 3D. Extends Chess to larger, even infinite, boards. () [All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2023-01-28 UTC

The diagram on the page superficially resembles that of Sphinx Chess, but it has only two axes of movement, the vertical and the horizontal. If you follow the lines of movement of pieces on this board, you will see that multiple boards have been placed together to create a larger playing area on which pieces are still moving in two dimensions.


4D Hexagonal Chess. 4D analogue of Glinski's Hexagonal Chess based on Hyperchess4. (5x(5x(5x5)), Cells: 361) [All Comments] [Add Comment or Rating]
Kevin Pacey wrote on 2023-01-28 UTC

If I recall/recognize the diagram correctly, at the diagram's bottom e.g. 'Ae' indicates (4D) Board column A and (2D) board file e. The labels at the sides e.g. '15' indicates (4D) Board row 1 and (2D) board rank 5 (a column being like a file by my understanding). True for both the rules page diagram and the preset diagram.

edit: I had to re-read the labelling by zooming in on the bottom of the diagram, so I could tell lower case letters apart from numbers - my eyesight/laptop's not the greatest, maybe. Also, there are over half a dozen 4D CVs in the database, as I recall seeing (I got a few of my own published over the years). Not as many as there are 3D CVs, true.


Ben Reiniger wrote on 2023-01-28 UTC

It should be the same as for rows/columns in 2d hexagonal games, right? (I'm not sure if we have a consistent policy for that...)

4d games are rare enough that I wouldn't have bothered to add a database column. It will probably cause confusion for new authors. But there's already reason to expound on the categories and index information on special cases, maybe as tooltips plus a link to a page describing non-obvious conventions?


Infinite Chess 3D. Extends Chess to larger, even infinite, boards. () [All Comments] [Add Comment or Rating]
Ben Reiniger wrote on 2023-01-28 UTC

The title of this page seems wrong on both counts: it is not infinite, and it is 4d, not 3d.

The introduction discusses infinite chess, but the eventual game description is clearly 4d (in an asymmetric, "2d+2d" way like Parton's Sphinx Chess).


Fergus Duniho wrote on 2023-01-28 UTC

Extending the number of ranks and files to infinity does not also increase the axes of movement through individual spaces. This is a large 2D game, but it is not 3D or 4D. So, I have removed it from those categories.


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