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Falcon Chess. Game on an 8x10 board with a new piece: The Falcon. (10x8, Cells: 80) [All Comments] [Add Comment or Rating]
Bn Em wrote on Thu, May 12, 2022 11:07 PM UTC in reply to dead dead from 09:56 PM:

Which of the two possible stepping Fortnights do you mean?

  • The one taking one each of wazir, ferz, and viceroy steps? Given that Gilman starts from the various bent/crooked pieces which only have two kinds of step, this is probably a bit out of scope (corkscrew pieces with one kind of step aside).
  • The one taking three Ferz steps, two in one direction and one at 60° (dual to the hex Shearwater)? That'd match the two‐of‐one‐and‐one‐of‐the‐other pattern of the Falcon, and arguably as a Shearwater extrapolation could be nameworthy (I'd've suggested Fulmar, a family of birds related to shearwaters beginning with the F of fortnight as shearwater begins with the S of sennight, but it's already taken (albeit with unclear etymology) for Zephyr+Lama; perhaps Petrel, the group including the fulmars and still beginning with a labial consonant, would suit it?), but presumably he either didn't consider two diagonal directions different enough without the AltOrth‐ness, or it just didn't occur to him. And there are also Nonstandard Diagonals at small enough angles (35°) for more Falcon‐like pieces there too

For a stepping‐Trison component I'd probably choose the former, but individually both are interesting enough imo. There's still a few bird‐of‐prey names unused I think so if one were keen to name them in Gilmanesque fashion all that'd remain would be finding a game to use them in…


Manticore. (Updated!) Moves one space orthogonally, then slides outward as a Bishop.[All Comments] [Add Comment or Rating]
📝Bn Em wrote on Sat, May 7, 2022 04:18 PM UTC in reply to Jean-Louis Cazaux from Fri May 6 05:55 AM:

Perhaps that's where Daniil Frolov got it from?

I've found a few other uses since writing this page (including one in JWB's Meta‐Chess) but haven't yet decided to update it; perhaps some time soon


Very Heavy Chess. A lot of firepower with all compounds of classical chess pieces.[All Comments] [Add Comment or Rating]
Bn Em wrote on Sat, May 7, 2022 04:15 PM UTC:

If we're talking prior usage, it's worth mentioning that Valkyrie has at least three distinct usages already: A queen that can also relocate friendly pieces, Bishop capturing as Queen, and a 3D‐specific piece moving as Rook or jumping two steps on either kind of diagonal. Conversely Heroine (albeit perhaps due to potential Drug associations) is afaict only used by Gilman for a Hex‐prism‐specific compound

Fwiw, Gilman also uses Hero on that last page, and there's also a Hero in Hero Chess. Surprisingly, Gilman seems to lack names for the two pieces under discussion (Knight+Chatelaine/Primate, to use his terminology) though. I suppose one could suggest Catholicos for BWN, as a rank above cardinal that starts with Ca‐ (for the usual extrapolations: Zetholicos ⁊c), but besides the long and awkward Archchancellor (note the double ⟨ch⟩) idk what he'd've used for the RFN

Pythia seems to be unused (understandably, given its relative obscurity); arguably it falls afoul of Fergus' objection to multiple ‘popesses’, as there was only one Pythia at a time, but as Jean‐Louis notes, if we can have two Sissas…

Imo Popess feels a bit awkward as a word, and I share Jean‐Louis' reservations re unnecessary loanwords; Pythia, Valkyrie, Heroine, and Baroness all sound fine to me


Chess 66. Board based on the 8x8 arrangement - with the difference that 66 fields are now available. (8x8, Cells: 66) [All Comments] [Add Comment or Rating]
Bn Em wrote on Thu, Apr 21, 2022 07:38 PM UTC in reply to Gerd Degens from 07:12 PM:

As I understand it, Fergus has decided to program a variant based on yours, and given it a different name to signal that it's not the same game. As a game in itself yours remains intact (and probably eventually publishable too if and when the Editorship approves), just more difficult to program given the primitives that Game Courier provides.

This game differs from yours only in that both a4 and 4, or both 5 and h5, can be occupied/passed through simultaneously. As such those spaces connect to the rest of the board in the same way they do already, they just stop being a ‘switch’ in the railway sense (aka a ‘set of points’ in my native British English, or German ‘Weiche’ as used in your original German page) and become just an unusual topological/geometrical feature of the board.

I'll admit I find it a little odd that such conditionally untraversible squares should be so difficult to implement (couldn't it be done with uncapturable dummy pieces that appear and disappear as the other square is occupied and vacated?), but I'm not a programmer and I've never had a go at writing GAME Code, so…


Bn Em wrote on Wed, Apr 20, 2022 03:10 PM UTC in reply to Gerd Degens from 07:02 AM:

It is probably appropriate to add that the switch can be operated not only from 'below' but also from the side.

Seeing as it can also be operated from ‘above’ too, if not already occupied (i.e. from my understanding, B a4–c2; R a6–4 is legal), I would agree that'd make sense.

  1. N a4-c3 ---> N a4-c2
  1. N f5-c4 ---> N f5-d4

?? Are those corrections? Aren't those diagonal moves, the way you've assigned file labels? of two and one steps respectively?


Bn Em wrote on Tue, Apr 19, 2022 09:23 PM UTC in reply to Gerd Degens from 06:39 PM:

A rook/queen on the rank 4 can only occupy square a4 and not square 4. This applies to the switch h5/5 vice versa.

That's interesting; given that a rook is allowed to move sideways from 4 onto b4 and beyond, that means that a rook on 4 can threaten a rook on b4 without being attacked back. Is this intentional?

The squares 4 and 5 do not have a uniform color. The squares are each composed of both colors.

Strictly speaking, the colours on the squares are a representational convention and bear no real influence on the game; ‘a bishop can change colour’ is equivalent to saying a bishop can reach the whole board, or in other words all squares are effectively the same colour. But that's a minor quibble

En Bw

I assume you mean me? That's one correct letter out of four, with two more misplaced ;)

I don't think that the moves to a5 and b5 are legal since they are on the same line.

That's one of the few things which changes depending on the knight‐move definition; the definition you've chosen would indeed exclude both destinations, as a queen can reach both of those squares; but the more usual definitions H.G. first brought up (either two othrogonal steps in one direction and one at right angles, or (my preferred expression) one orthogonal and one diagonally outwards — in either order (or not…?) and for some suitable definition of ‘outwards’) would probably allow both moves. Equally the question of whether N h4–g6 is legal, and probably other similar moves, is implicated there. There may be some way of defining the knight move to include only a subset of the moves in question, but that's unltimately for Gerd to decide if he wants to look for (or someone else to contribute if they come up w/ sth).


Bn Em wrote on Tue, Apr 19, 2022 01:52 PM UTC in reply to Fergus Duniho from 01:02 PM:

a series of moves in the generic rule-blind style of notation I used earlier

The move sequences given by Gerd in his comment are B d1–4; B 4–b5 and B d1–5; B 5–g6. He also notes that B d1–h5 is not legal, but B d1–a4 is.

How come the Bishop goes from 5 to g6?

The top corners and the top and left sides are shared between h5 and 5, but the bottom side and corners are different. So 5 behaves as h5 from above (and cannot be occupied at the same time as it), and so is diagonally adjacent to g6.

When the Bishop goes from 5 to g6, is it affected if another piece stands on h5?

5 and h5 cannot be occupied simultaneously, so this situation does not arise. But since both are diagonally adjacent (by the same corner) to g6, it would presumably be fine if they could.


Bn Em wrote on Mon, Apr 18, 2022 10:02 PM UTC in reply to Fergus Duniho from 09:28 PM:

a Knight on one of these spaces could not move as though it were on the other space. However, that looks like what the Knight is doing in your example

That much is clarified in the accompanying text. All three of e4, f6, and g7 can be reached by an orthogonal step (taking into account the rule about sideways moves from 5 going directly to g5) followed by a diagonal step.

This holds equally well whether we use the author's preferred definition for the knight move or either of the more common ones H.G. suggested

there are no bugs in the variant and the set of rules is consistent. Complicated, yes, but conclusive.

Afaict, the rules themselves are indeed consistent (and may well lead to an interesting game), but the explanation could be clearer, as shown by the fact that they seem to be unclear in some respect of another to most of the readers here.

Also I second H.G.'s request for clarification on the matter of knights moving through/over closed switches


Bn Em wrote on Sat, Apr 16, 2022 10:44 AM UTC in reply to Gerd Degens from 09:16 AM:

That's not according to the rules. Correct is: a rook can checkmate a king on h1 from h8, h7, h6, but not from h5 or 5.

Of course. I think I accidentally started on the wrong side of the board and then applied half a correction (it was late last night). But in any case that still answers my question, Thanks


Bn Em wrote on Fri, Apr 15, 2022 11:40 PM UTC in reply to Gerd Degens from 01:37 PM:

I use the word 'field' as a synonym for playing field or square. 'Field' has nothing to do with space in German.

The English word ‘space’ is used to refer to individual squares (or other shapes if boards are irregular) of the board. ‘Square’ is also used, as is ‘cell’ (especially in 3D) or ‘hex’ in hexagonal‐cell games. As ‘Feld’ is indeed, as Fergus rightly intuited, used for the same thing in German, it is thus the German word for space in this sense. Conversely, ‘field’ in English is rather unusual as a way of referring to spaces (i.e. squares ⁊c.)

Of course the usual sense of ‘space’ is better translated as ‘Raum’ or the like (hence e.g. Raumschach), but that sense is not what's meant here

This reads better, but it seems to be stating the obvious

My reading of the German suggests that ‘Farbtransfer’ — i.e. ‘Colour Transfer’ — is being use in a slightly more technical sense to refer to a particular kind of event (cf. e.g. ‘Bishop Conversion’ due to Carlos Cetina, which is more specific than simply converting bishops by some arbitrary means); after all, neither ‘Farbtransfer’ nor ‘colour transfer’ is an everyday word or phrase. And since the German also does not mention possibility (*‘dann muss ein Farbtransfer stattfinden können’) I'd probably translate it as your tautological‐looking one, but with ‘Colour Transfer’ capitalised

Could a Bishop move from d1 to e8 along the path d1-c2-d4/4-b5-c6-d7-e8?

Assuming ‘d4’ is a typo for ‘a4’, then my reading of the rules agrees that it could indeed take this path, or instead a path d1–e2–f3–g4–5–g6–f7–e8.

The position on the Switches must be clear. Either field 4 or field a4 [but not both; analogously for 5/h5] must be occupied

In other words, a piece moving onto the switch must choose on the turn that it gets there which squares it can move off onto? And so e.g. a rook can checkmate a king on h8 from h1, h2, h3, or h4, but not h5 or 5?


Tardis Taijitu. Xiang Qi board but with movable, bigger-inside-than-outside Fortresses. (3x(9x10), Cells: 144) [All Comments] [Add Comment or Rating]
Bn Em wrote on Tue, Mar 29, 2022 10:52 PM UTC in reply to H. G. Muller from 08:19 PM:

I've thought of smaller tardises before too, and agree that for most games they'd probably be more practical. As for checkmating difficulty, it seems that Charles was probably relying on the fact that Kings are confined to them, and so presumably the idea (or at least one possible strat) is to get as many offensive forces inside the tardises as possible while the board is still full enough to prevent too much tardis movement (as in the opening setup) and then use that to attack where the king can't escape. And potentially keep the armies spread‐out enough to prevent too much possible movement.

I agree that stopping teleportation whilst in check (after all, The Doctor sticks around until the danger's gone…) looks like a viable option should this indeed be unwinnable in practice


Bn Em wrote on Tue, Mar 29, 2022 07:38 PM UTC:

A piece moving diagonally through a cell orthogonally adjacent to a Tardis may do so through either two opposite corners of that cell, or one of the non-Tardis corners and halfway along the Tardis-bordering edge.

It took me disappointingly long to figure out how said diagonal moves into/out of the Tardises work, but I think I've got it now: for reference, a bishop starting from c4 could move souteast into the white Tardis (in its starting position as shown in the diagram) and continue along its a6f1 diagonal; from d4 it could go southeast b6f2 or c6f3, able in both cases to exit to the main board's g1; from e4 the southeast move takes it either d6f4 or e6f5, exiting onto g2; and moving southeast from f4 it may reach g3 via the Tardis' f6 or skip that square completely. Ofc from the latter three squares there are southwestward Tardis‐crossing moves too, and likewise from other squares.

a player may move the entire Tardis […] to swap place with any completely empty 3x3 block of non-Tardis cells

I see where this comes from, though it seems the emphasised restricion may be unnecessary at least in theory; the path‐splitting rule seems like it could be unambiguously be applied recursively, and from a lore perspective Tardises (well, the TARDIS) have been known to materialise inside each other (or even inside themselves, whether at the same or different points in their own timeline) on the show. The only problematic case would be a Tardis straddling a Tardis' edge (though they've never been seen inside each other's doors either, so…).

Subdividing the original Xiang Qi board

It seems the array diagram is missing a rank :‌(

For what it's worth, I like the idea behind this game a lot, though I haven't had a chance to try it; the unusual connectivity is interesting, the moving palaces a nice addition, and the way of incorporating extra space innovative. And the Tardis is the last entry in Man and Beast, too; a suitably unusual way to finish an epic series of articles.


Castle Siege Chess. Members-Only Traditional Chess merged with Circular Chess.[All Comments] [Add Comment or Rating]

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WeGo Chess. Members-Only Perfectly balanced, simultaneous play.[All Comments] [Add Comment or Rating]

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Chess with magical connections. Missing description (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
Bn Em wrote on Thu, Mar 24, 2022 04:03 PM UTC in reply to Aleksandr Kostin from 02:45 PM:

Besides the points made about your other submission, some of which apply here too, I have one further main question about this: What exactly is a ‘connection’? The mention of ‘support’ in the rules section suggests that it means being defended by a friendly piece (and the diagrams seem to support this), but it could be stated more clearly.

Also a minor question: are Kings excluded from providing ‘connections’ (as they are excluded from the effects of your other game), or is it just the own‐side pawns?


Chess with magic fields. Members-Only Missing description (8x8, Cells: 64) [All Comments] [Add Comment or Rating]

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Hopping Sliders[Subject Thread] [Add Response]
Bn Em wrote on Sat, Mar 5, 2022 02:05 AM UTC in reply to Daniel Zacharias from Fri Mar 4 01:54 AM:

It looks like ski-whatever is the only name anyone's used for these pieces.

Well… strictly speaking Gilman extended (in M&B06) the name Picket, as well as its orthogonal and 3D‐/hex‐diagonal counterparts (resp. Pocket and Packet) and their forward‐only counterparts (Piker/Poker/Paker) and compounds (typically with the suffix ⟨‐on⟩, as in e.g. Fezbaon for H.G.'s Lame Duck), to include pieces which leap over the first cell, or indeed the last or any single intermediate one — these latter three being resp. early‐ late‐ and flexi‐leap versions of the usually Stepping pieces.

It seems he only ever used the stepping form in his actual games though (though it seems ski‐ itself is (or at least originates as) problemist usage, which fwiw Gilman tended to be dismissive of, if not without his reasons)


Bn Em wrote on Thu, Mar 3, 2022 04:26 PM UTC in reply to Daniel Zacharias from 01:36 AM:

‘Ski‐’ seems to date back at least as far as Jelliss' ’All the King's Men‘, which would seem to be a work about pieces but not an actual game (I can't seem to access it though, and fsr the link in the Alphab. Index is to https://www.chessvariants.com/link/). Idk if he got his terminology from another source himself

I knew I must have forgotten something — looks like it was indeed Tenjiku's Tetrarch


Bn Em wrote on Wed, Mar 2, 2022 11:04 PM UTC in reply to Daniel Zacharias from 09:52 PM:

The Google Custom Search turns up this when searching for ‘ski‐rook’: https://www.chessvariants.com/other.dir/abc-chess.html

Apparently it contains a (leaping) ski‐bishop, though no actual ski‐rook. Only one I could find though. EDIT: Never mind, apparently it's just an example. And all the other usages of ski‐sliders or Pickets (and their compounds) seem to be lame. Which leaves only a game which I've had in mind but not yet got round to writing up, where a leaping‐picket+wazir promotes from a Phoenix/Waffle. And arguably (albeit failing the ‘straight line’ condition) the original GA unicorn/rhinoceros

I must admit I'm surprised these aren't more popular…


Game Courier. PHP script for playing Chess variants online.[All Comments] [Add Comment or Rating]
Bn Em wrote on Sun, Feb 27, 2022 11:43 PM UTC:

Speaking of 404's, I also get those from the What's New page, specifically the two newest links (Cubic Chess and 3D Chess 4 Cubed). Though they also have the External Link icon next to the name, so perhaps that's related.


Morley's Chess. Boards with enlarged sides.[All Comments] [Add Comment or Rating]
Bn Em wrote on Sat, Feb 26, 2022 12:45 PM UTC:

Having just read the book, this description is erroneous. Morley does propose the first variant givn on this page, but it is an alternative proposal, offered almost reluctantly after a digression on Knight's Tours, to the one the book is ‘about’ (though in many ways it's really a long and winding — though charming — book of Chess‐variant apologetics); the main variant in the book has only the ‘corridors’ on the sides, not the ones behind the camps. The second version offered here would seem to be apocryphal.

The corridors originate, according to Morley, as a way of giving the Rooks' pawns the ability of capturing in both directions, as the other 6 pawns can. The promotion rule is, as suggested here, that pawns can promote on the enemy back rank — pawns are given the opportunity to capture into the corridor ‘at their own risk’.

The variant as a whole is intended to expand the possibilities of the game (and counteract its being ‘played out’ — not so much between players of equal strength, as between players of potentially equal intuitive ability but differing levels of learnedness, esp. re the Opening) without making any changes to the rules or pieces, in contrast to e.g. Henry Bird's earlier proposal (referred to in the text) which introduces the Carrera compounds, as the added complexity would in his opinion be, though perhaps interesting to experts, too intimidating for lay chessplayers.

As a change, the ‘inverse Gustavian’ board (i.e. adding everything except the corners on each side) is a nice way of accomplishing that goal imo (and indeed, the Gustavian board has the opposite goal: introducing new pieces while changing the board as little as possible).


Rules of Chess. Missing description[All Comments] [Add Comment or Rating]
Bn Em wrote on Sat, Feb 19, 2022 05:02 PM UTC:

I see at the bottom of that page a note saying that it was translated by Altavista's Babelfish. We should probably get rid of it,

The note does also say that one “Cherry X.Z.”, who even had an email address linked in Wayback's copy, ‘modified’ it, which may mean it has had some human input to make it sensible Chinese. But my own Chinese isn't good enough to judge the correctness/idiomaticness(?) of the original page, so I can't weigh in on it from that perspective. I'm happy to leave that up to Editorial Discretion


波斯象棋(Shatranj). 廣泛出現在波斯的遊戲,國際象棋的前身 (Chinese Language)[All Comments] [Add Comment or Rating]
Bn Em wrote on Sat, Feb 19, 2022 12:28 PM UTC in reply to Fergus Duniho from 03:34 AM:

The link in the introduction is broken; it should probably point to the author's translation of the Chaturanga page — note that the latter, as well as the Courier Chess page still need converting (the Shogi page oþoh seems intact — it was last edited in 2018 though so perhaps it escaped the corruption). Also is there an old backup of the Chinese page on FIDE? As it stands now it's complete nonsense. EDIT: The Wayback Machine has a copy (and the garbled version seems to have the same update stamp so it probably hadn't changed in the 14 years before conversion to its current state)

I don't see anything wrong with having pages in multiple languages here, and we do indeed have some pages in Spanish, among others. The Alphabetical Index issues queries for English pages only by default, but you can query for non‐English pages too — apparently there's only(!) 108 of them so there's no difficulty getting them to display. Though in any case the Index lacks pages for “Pages beginning with ⟨菲⟩”, for example…


菲舍爾任意制象棋(Fischer Random Chess). 费舍尔的随机国际象棋变体 (Chinese Language)[All Comments] [Add Comment or Rating]
Bn Em wrote on Sat, Feb 19, 2022 11:55 AM UTC in reply to Fergus Duniho from 12:33 AM:

That does indeed look quite plausible (as does the Shatranj page), and concords with my own efforts at making sense of it, as well as lining up, afaict, with what the English page says.

The note at the end looks a little odd (It literally reads, as far as my Chinese gets me: “This is our English page's translation Fischer Random Chess”; the syntax of the Chinese is fine afaict but the link afterward, even with a space separating it, reads strangely). Would it be worth putting the link on the Chinese for “Our English page” (i.e. “我们英文页面”) instead?

Also incidentally what software did you use to convert it to CP1252? All the immediately accessible ones on linux seem to put up a (quiet) fuss about e.g. U+0081 not being available in the target encoding.


Bn Em wrote on Fri, Feb 18, 2022 01:58 PM UTC in reply to Fergus Duniho from 03:33 AM:

tried to enforce a site-wide use of UTF-8

That'd explain it: probably the conversion caught some pages that were already in UTF-8 and reëncoded them too.

different kinds of Chinese

My quick attempt last night at deëncoding using Libreoffice gave some pretty plausible‐looking UTF-8‐encoded Traditional Chinese (modulo anything encoded with byte 0x81, or presumably any other bytes unassigned in CP1252).


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