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2.Manticore and 2. Griffin ?[Subject Thread] [Add Response]
Jean-Louis Cazaux wrote on 2021-08-04 UTC

In wikipedia Fairy chess pieces they are the Osprey for DthenB and the Ostrich for AthenR


UPDATED! This item is a game information page
It belongs to categories: Two dimensional, Large board
It was last modified on: 2021-08-04
 By Albert  Lee. Amazonia. (Updated!) 11x11 board with Pawns that promote to Princesses in the middle of the board.[All Comments] [Add Comment or Rating]
Albert Lee wrote on 2021-08-04 UTC

Hi Fergus,

I have elaborated more on the Flying General move and included Janggi as well in the explanation.


Fergus Duniho wrote on 2021-08-04 UTC

What's the Flying General in Xiangqi?


2.Manticore and 2. Griffin ?[Subject Thread] [Add Response]
Bn Em wrote on 2021-08-04 UTC

Charles Gilman called these Zephyr and Lama respectively, though by his description they cannot make the one‐step move that I'm not sure whether you're including. The latter also turns up as an Osprey in Expanded Chess


Apothecary Chess Tournament[Subject Thread] [Add Response]
Aurelian Florea wrote on 2021-08-03 UTC

I have assigned the round six games!


NEW! This item is a game information page
It belongs to categories: Two dimensional, Each player has a different army
It was last modified on: 2021-07-26
 By Albert  Lee. Chess vs Strong Makruk. Chess against an enhanced Makruk army in an 8x8 board.[All Comments] [Add Comment or Rating]
Albert Lee wrote on 2021-08-03 UTC

This post is ready for publication.


UPDATED! This item is a game information page
It belongs to categories: Two dimensional, Large board
It was last modified on: 2021-08-04
 By Albert  Lee. Amazonia. (Updated!) 11x11 board with Pawns that promote to Princesses in the middle of the board.[All Comments] [Add Comment or Rating]
Albert Lee wrote on 2021-08-03 UTC

This post is ready for publication.


UPDATED! This item is a game information page
It belongs to categories: Two dimensional, Orthodox chess set but with special rules about the board
It was last modified on: 2021-07-29
 Author: Alessandro  Castelli and Fergus  Duniho. Inventor: Don  Miller and Leo  Nadvorney. Spherical chess. (Updated!) Sides of the board are considered to be connected to form a sphere. (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2021-08-03 UTC

On e.g. a 10‐file board, Miller's reasoning would line up with Nadvorney's.

That's a good point. On a 10-file board, the files would surround the pole in a way that makes diagonal movement more intuitive, and once the board was defined, it would be easy to make spherical adaptations of various 10x8 variants like Grotesque Chess and other related games or 10x10 variants like Grand Chess.


Fergus Duniho wrote on 2021-08-03 UTC

All I did to the original diagram was change its formatting to make it easier to read. I got the idea for putting a box around the main board from Pritchard, who did the same, but unlike him, I left all the inner coordinates in.


Bn Em wrote on 2021-08-02 UTC

While on its own the original diagram on this page was a bit obscure, in conjunction with Fergus' circular diagrams it really clarifies the rationale behind Nadvorney's interpretation of the diagonal move; a bit of thought also reveals why Miller's reasoning in keeping the bishop on its own colour is flawed: if the bishop stays on its own colour you would expect a rook stepping over the pole to change colour as it does on a normal square‐cell board, whereas here (or on any spherical/Klein‐bottle‐shaped board with a multiple of four files) it doesn't. On e.g. a 10‐file board, Miller's reasoning would line up with Nadvorney's.

As for Chess on the Dot, the change in the diagonal's handedness at the poles also keeps it on one colour (on a board of this parity), but isn't stirctly necessary for a closed loop: Nadvorney's version (as can be seen on its diagram) does it just as well, and even Miller's manages, albeit via a much more circuitous route.

Fwiw, here's the original diagram as salvaged from the Internet Archive:

c7  d7  e7  f7  g7  h7  a7  b7  c7  d7  e7  f7
c8  d8  e8  f8  g8  h8  a8  b8  c8  d8  e8  f8
g8  h8  a8  b8  c8  d8  e8  f8  g8  h8  a8  b8
g7  h7  a7  b7  c7  d7  e7  f7  g7  h7  a7  b7
g6  h6  a6  b6  c6  d6  e6  f6  g6  h6  a6  b6
g5  h5  a5  b5  c5  d5  e5  f5  g5  h5  a5  b5
g4  h4  a4  b4  c4  d4  e4  f4  g4  h4  a4  b4
g3  h3  a3  b3  c3  d3  e3  f3  g3  h3  a3  b3
g2  h2  a2  b2  c2  d2  e2  f2  g2  h2  a2  b2
g1  h1  a1  b1  c1  d1  e1  f1  g1  h1  a1  b1
c1  d1  e1  f1  g1  h1  a1  b1  c1  d1  e1  f1
c2  d2  e2  f2  g2  h2  a2  b2  c2  d2  e2  f2 

NEW! This item is a Zillions-of-Games file
It belongs to categories: Two dimensional, Orthodox chess set but with different capturing rules
It was last modified on: 2021-07-31
 Author: Fergus  Duniho. Inventor: John  Leslie. Hostage Chess ZIP file. Pieces taken are held hostage and can be exchanged against other pieces and then dropped.[All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2021-07-31 UTC

John Leslie noticed some bugs in the previous version, and I found out that the latest version on my computer had already fixed those bugs. So I included it in a new zip file with some changes to the initial comments.


UPDATED! This item is a game information page
It belongs to categories: Two dimensional, Large board, Three or more players, From ancient times, War game, Chess combined with some other game or sport
It was last modified on: 2021-07-27
 By Daphne  Snowmoon. Pandemonium (Surajang修羅場). (Updated!) Capablanca chess + Crazyhouse.[All Comments] [Add Comment or Rating]
Daphne Snowmoon wrote on 2021-07-30 UTC

Some pieces have been renamed

Van -> Wazir (Movement also changed: D -> W)

Ferz(Sa士) -> Ferz(In刃)


UPDATED! This item is a game information page
It belongs to categories: Two dimensional, Orthodox chess set but with special rules about the board
It was last modified on: 2021-07-29
 Author: Alessandro  Castelli and Fergus  Duniho. Inventor: Don  Miller and Leo  Nadvorney. Spherical chess. (Updated!) Sides of the board are considered to be connected to form a sphere. (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2021-07-29 UTC

I have updated this page with diagrams and more detailed descriptions.


NEW! This item is a game information page
It belongs to categories: Two dimensional, Orthodox chess set but with different moving pieces, Orthodox chess set but with different initial setups
It was last modified on: 2021-07-13
 By John  Loftus. All Out. The pieces are dropped one at a time, remaining immobile until the king is dropped.[All Comments] [Add Comment or Rating]
Ben Reiniger wrote on 2021-07-28 UTC

From this:

Pieces of a player's army may not move until their army's king has been placed on the board.

I take it that pieces can be kept in hand indefinitely after piece movements have begun. But the first sentence:

Players take turns dropping their pieces onto an empty board one at a time, anywhere, and in any order they wish.

gives the impression that all drops happen before ordinary movement begins. A little clarification would be nice.

This is fairly similar to some other games. I think the closest may be Unachess; the main difference is that there, noncapturing moves are allowed before the king arrives. There is concern expressed on that page that white has a significant advantage by rushing a queen+king; does that not happen here (and why not)?

Why limit to two pawns?


This item is an organization, society, group or company
It belongs to categories: Not categorized
It was last modified on: 2017-09-07
 Author: Fergus  Duniho. NOST: kNights Of the Square Table. kNights Of the Square Table.[All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2021-07-28 UTC

Are there any former NOST members around with back issues of NOSTalgia that could be scanned and put on the internet? The NOST website had only a few of the latest issues. Pritchard sometimes used it as a source for his Encyclopedia of Chess Variants, but his descriptions of games are often sketchy rather than complete.


UPDATED! This item is a game information page
It belongs to categories: Two dimensional, Orthodox chess set but with special rules about the board
It was last modified on: 2021-07-29
 Author: Alessandro  Castelli and Fergus  Duniho. Inventor: Don  Miller and Leo  Nadvorney. Spherical chess. (Updated!) Sides of the board are considered to be connected to form a sphere. (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2021-07-28 UTC

I started on adding an introduction, but it's late, and I will have to wait until tomorrow to continue.


Fergus Duniho wrote on 2021-07-28 UTC

I have a better idea of how this works now. I was describing a torus in my last comment. Unlike a torus, the north and south poles are not adjacent on a sphere. I will write up a better description and provide some more visual diagrams when I have the time.


Fergus Duniho wrote on 2021-07-27 UTC

The description of this game is very confusing. The middle eight rows make sense. These include a regular Chess board with two files from the other side on each side. This much is like Cylindrical Chess.

g8  h8  a8  b8  c8  d8  e8  f8  g8  h8  a8  b8
g7  h7  a7  b7  c7  d7  e7  f7  g7  h7  a7  b7
g6  h6  a6  b6  c6  d6  e6  f6  g6  h6  a6  b6
g5  h5  a5  b5  c5  d5  e5  f5  g5  h5  a5  b5
g4  h4  a4  b4  c4  d4  e4  f4  g4  h4  a4  b4
g3  h3  a3  b3  c3  d3  e3  f3  g3  h3  a3  b3
g2  h2  a2  b2  c2  d2  e2  f2  g2  h2  a2  b2
g1  h1  a1  b1  c1  d1  e1  f1  g1  h1  a1  b1

But the two rows at the top and bottom do not fit the same pattern. Here is the pattern that would make sense to me:

g2  h2  a2  b2  c2  d2  e2  f2  g2  h2  a2  b2
g1  h1  a1  b1  c1  d1  e1  f1  g1  h1  a1  b1
g8  h8  a8  b8  c8  d8  e8  f8  g8  h8  a8  b8
g7  h7  a7  b7  c7  d7  e7  f7  g7  h7  a7  b7
g6  h6  a6  b6  c6  d6  e6  f6  g6  h6  a6  b6
g5  h5  a5  b5  c5  d5  e5  f5  g5  h5  a5  b5
g4  h4  a4  b4  c4  d4  e4  f4  g4  h4  a4  b4
g3  h3  a3  b3  c3  d3  e3  f3  g3  h3  a3  b3
g2  h2  a2  b2  c2  d2  e2  f2  g2  h2  a2  b2
g1  h1  a1  b1  c1  d1  e1  f1  g1  h1  a1  b1
g8  h8  a8  b8  c8  d8  e8  f8  g8  h8  a8  b8
g7  h7  a7  b7  c7  d7  e7  f7  g7  h7  a7  b7

I do not understand why the pattern on the page is not this.


deep thought wrote on 2021-07-27 UTC

The reason people are calling it a 'Klein bottle' rather than a sphere is because of the weird situation around the poles.

If you draw the eight spaces surrounding each pole as triangles, then the rook shouldn't pass -- it only crosses edges. If you draw them as squares and try to connect opposites, each pole becomes a 'cross-cap' rather than a point. A sphere with two cross-caps is topologically equivalent to a Klein bottle.

(Alternatively each pole could be a double-handle, then you have an orientable surface of genus 4.)


This item is a miscellaneous item
It belongs to categories: Not categorized
It was last modified on: 2015-12-11
 Author: Fergus  Duniho. Home page of The Chess Variant Pages. Missing description[All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2021-07-27 UTC

The tag description page-scripts aren't working.

That had to do with how I mass-edited many scripts to include the headcode.php script in the HEAD section. I have now corrected it for this script.


Ben Reiniger wrote on 2021-07-27 UTC

The tag description page-scripts aren't working.


UPDATED! This item is a game information page
It belongs to categories: Two dimensional, Large board, Three or more players, From ancient times, War game, Chess combined with some other game or sport
It was last modified on: 2021-07-27
 By Daphne  Snowmoon. Pandemonium (Surajang修羅場). (Updated!) Capablanca chess + Crazyhouse.[All Comments] [Add Comment or Rating]
Daphne Snowmoon wrote on 2021-07-25 UTC

Thanks for the kind reply!


H. G. Muller wrote on 2021-07-25 UTC

The rule that a Pawn dropped on 2nd rank regains his double push makes it a case of location-dependent moving, rather than an initial move. Position-dependent moving is not directly supported by the Interactive Diagram, but if can be emulated through automatic promotion: define multiple piece types for the piece with the variable move (all using the same symbol), and automatically 'promote' any of these types to the type that has the move belonging to the square they land on. This can be done by a user-supplied JavaScript function WeirdPromotion(). I did that in the Diagram I recently made for The Consuls.

In this case you would need two Pawn types, where only type 2 has the double push (and only type 1 promotes according to the normal mechanism on reaching the zone). Type 2 would always change into type 1 when it moves; both types would change into type 1 or 2 when they are dropped, depending on where they are dropped.

To make the promotion choice dependent on other pieces present on the board is problematic. The function WeirdPromotion() can also be used to veto promotions that would otherwise be possible. But the Diagram currently doesn't keep track of how many pieces of each type there are on the board. So it would have to scan the entire board to detect whether the proposed promotion piece is already there. This is possible, but would slow down the AI a lot. (But the AI currently cannoot handle games with drops anyway, so perhaps this is not a problem.)


Daphne Snowmoon wrote on 2021-07-25 UTC

Nelson // Thank you very much !!

(´ ˘ `)

Pawns, unlike other pieces, can be promoted over and over again. The reason is to strengthen the Pawn's advance.

Pawns can be dropped at 1st rank, so they can defend more actively. (For example, like Shogi's Anaguma, you can move the King into a corner and surround it with Pawns.)

However, the Pawn's attack power is relatively weak. Compared to other promoted pieces, Pawn has a lot of limited movement, and I thought it needed appropriate compensation. That's unlimited promotions.

As the saying goes, 'Pawns are the soul of chess', I felt that Pawns needed a unique feature.


Daphne Snowmoon wrote on 2021-07-25 UTC

H.G. //

Rule to advance 2 squares when moving to 2nd rank after a Pawn is dropped in 1st rank

Rule with restrictions on promotion (e.g., among the promoted pieces, only one piece with the same movement can exist on the board)

etc ?


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