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Chess on a Tesseract. Chess played over the 24 two-dimensional sides of a tesseract. (24x(5x5), Cells: 504) [All Comments] [Add Comment or Rating]
Kevin Pacey wrote on Wed, Dec 13, 2023 08:06 PM UTC in reply to Joe Joyce from Tue Dec 12 09:29 PM:

Hi Joe

You say your "superpower" is extreme concentration? My (slightly younger) brother can see infrared heat with his vision - may have helped in his stint in the Reserves, besides watching his coffee cool down from a distance.

I hadn't thought much if I had any "superpowers". At times I think I have at least one form of ESP that's pretty useless, as it involves sometimes 'knowing' something unfortunate is going to happen to me soon. The best I can do is brace myself psychologically, rather than feel dread. For example, on my way to a chess club for several weeks in a row, I suddenly knew as I approached the building that I was going to lose my game that night - didn't matter about the strength of my opponent on a given night.


💡📝Bob Greenwade wrote on Thu, Dec 14, 2023 05:25 PM UTC:

I haven't reworked the text yet (other than deleting some extraneous stuff with overly large graphics), but I do have new diagrams that I hope are sufficiently legible:

Explanation will still be needed, and I do plan to still include "spread" diagrams for 01, 06, 10, and 60, but this is what starts things out.

PS: I'm still of a mind to replace the zeros on the Black cube with 7s. That would keep the pattern of lower digit first, and the pattern of opposing digits (first digit of one number and second of the number on the opposite Face) adding up to 7.


💡📝Bob Greenwade wrote on Thu, Dec 14, 2023 06:44 PM UTC:

I've reworked the text now, and somehow this much more concise description looks sufficient to me. I still need to update the (still-theoretical) physical board setup, as well as a two-dimensional version to help with Game Courier, but if editors agree that the description is good, then I think it could be published.


🕸Fergus Duniho wrote on Thu, Dec 14, 2023 11:30 PM UTC in reply to Bob Greenwade from 06:44 PM:

One thing your game description is still lacking is a rule for how the ranks and files on a face are laid out. In your illustration of an example Territory Face for White, the first rank is on the edge adjacent to the Home Face. When a piece moves to an Open Face, I imagine the ranks and files should be kept consistent. For example, if a face is adjacent to the far rank of one Face, the edge of it that is adjacent should be the first rank of that face. For this to work, Black's Pawns and Spears should go on the last rank of the Territory Faces they begin on. But the question remains whether it can be made to work. Is there some geometric proof that this works, or will someone have to lay out each face with ranks and files on it and check that they all line up?


🕸Fergus Duniho wrote on Thu, Dec 14, 2023 11:53 PM UTC:

You've left out the usual 2D representation of a tesseract, which I think is helpful for imagining the geometry of how the faces are connected to each other. The pictures you do have do not give the same perspective on a tesseract, and being crowded with designations for the faces makes it harder to get an idea of the geometry behind the shape.


🕸Fergus Duniho wrote on Fri, Dec 15, 2023 12:04 AM UTC in reply to Fergus Duniho from Thu Dec 14 11:30 PM:

Since 02 and 03 are both Territory Faces on 01, the edge shared between them will be along the left file of one and the right file of the other, but at the edge where they are adjacent to each other, each is also adjacent to 23. Following what I proposed earlier, this would have to be both the left file and the right file of 23, but that's a contradiction. So, this will not work. How, then, can ranks and files on each face be arranged in a consistent way?


💡📝Bob Greenwade wrote on Fri, Dec 15, 2023 12:17 AM UTC in reply to Fergus Duniho from Thu Dec 14 11:53 PM:

Good points, all that.

I'll leave the parallel-cube illustration there, but also add at least one designation-free version, and bring back some of the Schlegel diagrams (the cube-within-cube illustrations) for comparison, including the series of breakouts that I had, and the 2D layout as well as an updated 3D playspace. (I could also stack the "spread" diagrams into a sort of limited or modified Dali cross.)

As for the rank/file designations, that is admittedly something that I'm still figuring out. We're all used to the equivalent of {0,0} at White's left elbow, and I'm inclined to work things out the same way, but beyond that I'm not sure. The only way to be truly absolute about that would be to designate the White King's position as 0 and work out from there, with a special diagram for 01 and another for 06, 10, and 60, but I'd still be unsure about (as you say) what to do with 23, 24, 35, and 45. I'll sit down with it presently to work that out (probably parallel with the new diagrams).

I did already have in mind a solution to your last question: in all such cases, the lowest number takes precedence. In your example, 23 would continue from 02 rather than 03. (Explaining that is going to be a breeze, though, compared to making an illustration of it.)


🕸Fergus Duniho wrote on Fri, Dec 15, 2023 02:03 AM UTC in reply to Bob Greenwade from 12:17 AM:

I did already have in mind a solution to your last question: in all such cases, the lowest number takes precedence. In your example, 23 would continue from 02 rather than 03.

Here's where things become more difficult. By looking at an empty tesseract illustration, I'm able to plug in face designations and work things through. While 02 and 03 are Territory Faces of 01, so are 12 and 13. Like with 02 and 03, the edge they share in common is the left file of one and the right file of the other, and this edge also borders on 23. However, the edge of 23 it borders on is perpendicular to the edge that 02 and 03 border on. So, if 02 and 03 bordered it along a file, 12 and 13 would have to border it along a rank, or vice versa. This means that ranks and files will sometimes border each other along a common edge.

Maybe if you start Territory Faces with the edge appropriate to the edge of the Home Face is starts on, things will work out more easily. So, instead of putting Pawns and Spears on the first two ranks, do that for only two, and put them on the last two ranks for another two, on the leftmost files for another two, and on the rightmost files for another two.


🕸Fergus Duniho wrote on Fri, Dec 15, 2023 02:11 AM UTC in reply to Fergus Duniho from 02:03 AM:

Maybe if you start Territory Faces with the edge appropriate to the edge of the Home Face is starts on, things will work out more easily. So, instead of putting Pawns and Spears on the first two ranks, do that for only two, and put them on the last two ranks for another two, on the leftmost files for another two, and on the rightmost files for another two.

But even that is not an ideal solution. If, say, you start 02 on a rank and 03 on a file, then they will border along a file on 02 and a rank on 03. So, there is no way to escape files bordering with ranks unless you come up with a new non-Cartesian coordinate system.


💡📝Bob Greenwade wrote on Fri, Dec 15, 2023 02:14 AM UTC:

I've gotten a start on expanding the explanations, but I'm about ready to call it an evening. There are more illustrations to come, of course, especially the Schlegel diagram (which is uploaded) and its breakouts (which I haven't made yet).

I have figured that the coordinate system I describe works; I just have to figure out how to illustrate that.


💡📝Bob Greenwade wrote on Fri, Dec 15, 2023 02:17 AM UTC in reply to Fergus Duniho from 02:03 AM:

So, instead of putting Pawns and Spears on the first two ranks, do that for only two, and put them on the last two ranks for another two, on the leftmost files for another two, and on the rightmost files for another two.

I only put one setup illustration in for that because it would be too much to have four (not to mention that there really isn't a way to change the letters and numbers on the Musketeer board painter).


🕸Fergus Duniho wrote on Fri, Dec 15, 2023 04:05 AM UTC:

I thought of a different kind of coordinate system while in the shower. Each face has four sides, and each side borders on two other faces that share a number in their designations. For example, 01 borders on 02/12, 03/13, 04/14, and 05/15. So, its edges may be designated 2, 3, 4 and 5. Call the center square 00 and the eight spaces surrounding it 02, 23, 03, 34, 04, 45,05, and 45, dependinv on which sides each is closest to. Then call the outermost spaces 22, 32, 33, 43, 44, 54, 55, and 54. The higher numbers are used for spaces further from the center. Here an 11 multiple means a space that is two spaces toward that edge from the center. Any space in the game may then be designated by two numbers, perhaps written with a hyphen between them, such as 01-00 for the space White's king begins on.


💡📝Bob Greenwade wrote on Fri, Dec 15, 2023 05:49 AM UTC in reply to Fergus Duniho from 04:05 AM:

That's a decent, fairly organic alternative. I'll certainly consider it; I'll present both, but decide along the way which is the main one and which is the alternate for people with different preferences.

It may come down to which is easier for me to illustrate. ;) (And remember that "simpler" and "easier" aren't necessarily the same thing....)


Bn Em wrote on Fri, Dec 15, 2023 03:28 PM UTC in reply to Fergus Duniho from 02:03 AM:

ranks and files will sometimes border each other along a common edge.

This is common among non‐flat spaces; most multiplayer square‐cell boards have the same property (indeed some are effectively on cube surfaces, giving exactly the same effect seen here), as does the board of my Spherical Corner Chess.


🕸Fergus Duniho wrote on Fri, Dec 15, 2023 05:24 PM UTC in reply to Bob Greenwade from 05:49 AM:

That's a decent, fairly organic alternative.

One problem with it, which I thought of before going to sleep, is that the twelve intermediate faces all border on two edges with the number 0. For example, 12 borders on 01/02 and on 10/20. But it could be made to work by substituting another symbol for each of the two zeros, such as Z for the preceding 0 and X (Roman numeral 10) for the trailing 0. Alternately, you could use 7 instead of a trailing 0, which would make all the numbers around a face unique, and then use a different symbol than 00 for the center square. This also has the advantage of numbering each cube in the tesseract. The diagram I made makes it easy to identify the 8 cubes. These are:

  1. The inner cube of 01-06, 02-05, 03-04
  2. 01-10, 12-15, 13-14
  3. 02-20, 12-26, 23-24
  4. 03-30, 13-36, 23-35
  5. 04-40, 14-46, 24-45
  6. 05-50, 15-56, 35-45
  7. 06-60, 26-56, 36-46
  8. 10-60, 20-50, 30-40

💡📝Bob Greenwade wrote on Fri, Dec 15, 2023 05:40 PM UTC in reply to Fergus Duniho from 05:24 PM:

I replaced the zeros on Black's cube with sevens; the trailing zeros were throwing off even more patterns than what you describe.

I've changed and added graphics and edited text to reflect that change, and to describe the notation standards. I'll give a closer look at your notation a bit later.

I still need to make breakouts from the Schlegel diagram, and figure out if and how I can illustrate your circular notation method. Plus, something showing the relative directions of the Ranks and Files at the zero point.

And I'm sure you and others can point out other things that need to be done before this game is publishable. :)


🕸Fergus Duniho wrote on Fri, Dec 15, 2023 06:15 PM UTC in reply to Bob Greenwade from 05:40 PM:

I replaced the zeros on Black's cube with sevens; the trailing zeros were throwing off even more patterns than what you describe.

Okay, I've modified my tesseract image to use 7 instead of a trailing 0. This has the effect that each cube in the tesseract consists of all the faces with the same digit, which makes it easy to designate each cube with that same number, and each face designation is a combination of the numbers belonging to the two cubes which share that face. So, there are two ways of designating a face that give the same result in a convenient circling back kind of way.


💡📝Bob Greenwade wrote on Fri, Dec 15, 2023 06:20 PM UTC in reply to Fergus Duniho from 06:15 PM:

I actually hadn't noticed, until you pointed it out earlier, that this system gives each cube a number (0-7). I think it'd be a bit much to show pictures of each, but it's an interesting (and rather cool) feature.

I'll probably point that out the next time I go in to edit the text.


💡📝Bob Greenwade wrote on Fri, Dec 15, 2023 07:01 PM UTC:

Here's a tentative, preliminary look at a 2D playspace for this game:

No labels or paths shown; it's just the basic configuration.


💡📝Bob Greenwade wrote on Sat, Dec 16, 2023 04:49 PM UTC:

I may need to do some illustrating on movement between Faces and probably will provide such when I start posting about the physical playspace, but otherwise I think the "Geometric Concept" section is pretty good to go.

I also need to describe, and probably illustrate, Fergus' alternate coordinate system.

I'd appreciate editorial feedback at this time about anything that's unclear or simply forgotten.


💡📝Bob Greenwade wrote on Sun, Dec 17, 2023 07:17 PM UTC:

I put up some pictures of my (currently hypothetical) physical playspace. I probably will need to edit most of the illos to reduce their size before I go much further, though, since my file storage is filling up.

It did take me by surprise last night to see that the game was fully published. I didn't think it was quite ready (still needing some illustrations for movement from Face to Face, which I'm still going to work on short-term), but I think it'll still be good for now.

I'll have the edited illos to do, plus the movement illos, plus more of the Icon Clearinghouse and more preparation work than expected for the Dealer's Chess Expansion Set #4 (edit: plus figuring out how to fix the Snake vs. Mongoose game so it's actually playable in a balanced manner), so I think it'll be a while before I need to bother an editor or tech specialist again (other than trying to fix the Lariat in Zwangkrieg).

PS: Are the blue numbers too dark to be legible against the black trays?


🔔Notification on Sun, Dec 24, 2023 05:27 PM UTC:

The author, Bob Greenwade, has updated this page.


💡📝Bob Greenwade wrote on Sun, Dec 24, 2023 06:06 PM UTC:

Pursuant to possibly creating a Game Courier preset for this game (as mentioned a while ago), I've updated the 2D playspace graphic.

Once it's properly aligned, this will represent a space 82" x 58" (6'10" x 4'11").

Question: Will I need to rotate the "corner" Faces from their current 45 degree turn?


Ilya Yudovski wrote on Sun, Dec 24, 2023 07:49 PM UTC:Excellent ★★★★★

Astounding. I don't think I'll ever play something so complex, but the concept and work are awesome. The case, when reading about game rules and design, is almost as exciting, as the play itself.


Diceroller is Fire wrote on Sun, Dec 24, 2023 07:58 PM UTC in reply to Bob Greenwade from 06:06 PM:

Congrats on having it published! It was long but resulting!


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