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The Emperor's Game. Variant on 10 by 10 board from 19th century Germany. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]
Georgi Markov wrote on 2021-12-05 UTC

Indeed. Please see my comments on the Sultan's game page from October 20 and 21.


Turkish Great Chess variation V. Large variant with three new pieces. (13x13, Cells: 169) [All Comments] [Add Comment or Rating]
Georgi Markov wrote on 2021-12-05 UTC

Thank you for your comment and the discussion.


The Emperor's Game. Variant on 10 by 10 board from 19th century Germany. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]
gmarkov wrote on 2021-12-05 UTC

Capablanca Random Chess. Randomized setup for Capablanca chess. (10x8, Cells: 80) [All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2021-12-04 UTC

I have made an attempt to implement Fischer castling in the Interactive Diagram. There is no special XBetza notation for this; a shuffle game has to be specified with a 'nominal' setup. This setup defines (together with the XBetza normal castling definition) where the king must end up, and what the castling partners are (the corner pieces, which must be of equal type). If such a castling is defined, any shuffle that involves the king will then be restricted to make the king end up between the castling partners, and will activate Fischer castling.

To support the shuffle rules of Capablanca Random Chess I enhanced the Diagram's shuffle feature: An exclamation point before a piece in a shuffle specification now either means that pieces of that type should be equally distributed over square shades, or, when there only is one such piece, that it must remain on the shade it is already on. This way Q and A can be forced on different shades by putting them so in the nominal position, and order an extra shuffle of only Q and A to determine which one goes on which shade. The shuffle specs are thus QA,N!BR!AC!QK.

Initially a Diagram always shows the nominal position; there is no spontaneous shuffle. To shuffle you have to press 'Restart' in the AI control bar.

Note that the AI does not support the Fischer castling yet; I am still working on that.

files=10 ranks=8 promoZone=1 promoChoice=NBRQAC graphicsDir=/membergraphics/MSelven-chess/ squareSize=35 graphicsType=png shuffle=QA,N!BR!AC!QK pawn:P:ifmnDfmWfceF:pawn:a2,b2,c2,d2,e2,f2,g2,h2,i2,j2,,a7,b7,c7,d7,e7,f7,g7,h7,i7,j7 knight:N:N:knight:c1,h1,,c8,h8 bishop:B:B:bishop:d1,g1,,d8,g8 rook:R:R:rook:a1,j1,,a8,j8 queen:Q:Q:queen:e1,,e8 archbishop:A:BN::b1,,b8 chancellor:C:RN:chancellor:i1,,i8 king:K:KisO3:king:f1,,f8

The Sultan's Game. Variant on 11 by 11 board from 19th century Germany. (11x11, Cells: 121) [All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2021-12-02 UTC

When castling, the king move four squares toward one of the rooks, and the rook jumps to the other side of the king.

That definitely sounds more sensible. I had to add a special parameter castlingGap to the Interactive Diagram to support the weird way of castling that is described in the text. (I see the Diagram in the article has already been changed to castle in the normal way, though, unlike the one I first published in the comments.)


Capablanca Random Chess. Randomized setup for Capablanca chess. (10x8, Cells: 80) [All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2021-12-02 UTC

Umm, I did not even know this rule existed. WinBoard restricts the shuffle only to have the Bishops on different colors. I agree the rule makes no sense. I have also seen descriptions that did not allow the Bishops to be on adjacent squares. (That also seemed to make little sense.)

The Interactive Diagram would have to struggle to enforce this rule, because there is no way to tell it directly that a pair of pieces of different types would have to be placed on different square shades. As a work-around you could 'mark' the shades by piece type, by defining the nominal start position with a back rank RBRBNKNCQA, so that RNQ are on dark squares, and BKCA on light. You can then order a sequence of shuffles, RNQ,BKCA,QA,!BNRKC .

The first shuffle solely serves to put Q on a random dark square, the second to put A on a random light square, and the third then randomly swaps the two. The remaining pieces then have to be shuffled the usual way, i.e. the Bishops would have to go on opposit shades (indicated by the ! prefix).

I guess it would be useful to extend the shuffling capabilities of the Diagram with a prefix to indicate the piece should stay on the same color as it was in the nominal setup. Sy This would be indicated by #, then the shuffle instructions could be K#QC#AR!BN,QA, with a nominal setup where Q and A start on different shades.


The Sultan's Game. Variant on 11 by 11 board from 19th century Germany. (11x11, Cells: 121) [All Comments] [Add Comment or Rating]
Jean-Louis Cazaux wrote on 2021-12-02 UTC

The rule of castling is not correct as far as the Rook is concerned. When castling, the king move four squares toward one of the rooks, and the rook jumps to the other side of the king.

This will be corrected in future editions of A World of Chess, by JL.Cazaux and R.Knowlton.

In addition, the name Tressan has to be corrected to Tressau on this page.


The Emperor's Game. Variant on 10 by 10 board from 19th century Germany. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]
Jean-Louis Cazaux wrote on 2021-12-02 UTC

The rule of castling is not correct as far as the Rook is concerned. When castling, the king moves three squares when castling short and four when castling long. The rook jumps to the immediate square on the other side of the king.

This will be corrected in future editions of A World of Chess, by JL.Cazaux and R.Knowlton.


Capablanca Random Chess. Randomized setup for Capablanca chess. (10x8, Cells: 80) [All Comments] [Add Comment or Rating]
Thomas wrote on 2021-12-02 UTCExcellent ★★★★★

But why the limitation to set up queen and archbishop on different coloured squares, when they can change the square colour by moving like rook resp. knight?


Symmetric Chess. Missing description (9x8, Cells: 72) [All Comments] [Add Comment or Rating]
Carlos Cetina wrote on 2021-12-02 UTC

Very good, having cleared the cache and deleted the cookies, the AI no longer commits the illegality of not converting the bishop. Now it plays 24 ... Qc4. Continuing the game it developed like this:

1.g3 d5 2.d4 f5 3.Bg2 e6 4.f4 Qb4 5.c3 Qb5 6.Nf2 g6 7.Nd3 a5 8.a4 Qc4 9.Nd2 Qc6 10.Ne5 Qb6 11.b3 Nc6 12.Ndf3 Qd6 13.Ba3 Qd8 14.Bc5 Qa6 15.Qf2 Nxe5 16.Nxe5 b6 17.Ba3 Nf7 18.Nxf7 Bxf7 19.O-O Qf6 20.c4 dxc4 21.Bxa8 Qxa8 22.Ki1 cxb3 23.Rb1 Qd5 24.Rxb3 Qc4 25.Rd3 b5 26.axb5 Qxb5 27.Qa1 i5 28.Rb1 Qd5 29.Bc5 Qa8 30.Qa4 c6 31.Bb6 Bd8 32.Bxd8 Kxd8 33.Rdb3 Qa6 34.Rb6 Qa7 35.Qxc6 h5 36.Qd6 Qd7 37.Rb8#

Thanks for showing me the solution. So when will we see the Interactive Diagram offered on the Google Apps Store?


H. G. Muller wrote on 2021-12-01 UTC

When I paste that game up to move 24 back into the Diagram, and then play Rxb3, it doesn't reply with that same Bishop move. And when I play the (illegal) move Qa6 instead of Rxb3 it doesn't capture the Queen, but plays Bd8. Did you flush the browser cache, (Shift + reload in FireFox) to make sure you are using the latest version of the diagram script? You might have been using the old version where I hadn't implemented the rule yet. If you are sure you have flushed the cache you can paste the moves 1-23 back in the Diagram (in the dashed text box below the navigation buttons), and continue the game from there.


Carlos Cetina wrote on 2021-12-01 UTC

It seems that there is a bug such that the AI does not always make the conversion as can be seen in the following game on move 24 of the blue side:

1.g3 d5 2.d4 f5 3.Bg2 e6 4.f4 Qb4 5.c3 Qb5 6.Nf2 g6 7.Nd3 a5 8.a4 Qc4 9.Nd2 Qc6 10.Ne5 Qb6 11.b3 Nc6 12.Ndf3 Qd6 13.Ba3 Qd8 14.Bc5 Qa6 15.Qf2 Nxe5 16.Nxe5 b6 17.Ba3 Nf7 18.Nxf7 Bxf7 19.O-O Qf6 20.c4 dxc4 21.Bxa8 Qxa8 22.Ki1 cxb3 23.Rb1 Qd5 24.Rxb3 Bd7 25.Rc3 c5 26.Rd3 c4 27.Rd2 i5 etc


Carlos Cetina wrote on 2021-12-01 UTC

Magnificent! I encourage you to publish your Interactive Diagram in the aforementioned apps store since it is a very good showcase to spread ideas, in such a way that a certain number of variants could be played by default (including Symmetric Chess, of course!). I believe that you could get a fair remuneration in money for your work including banner ads. Using the app would be free. What do you say?


H. G. Muller wrote on 2021-12-01 UTC

Do you think that the Interactive Diagram software could be used in the Android environment?

I know that for sure. It is browser-based, and every OS nowadays has a browser that understands HTML and JavaScript. So you don't need a separate App for it. (Of course the browser is also an App, but I assume everyone already has that.) It works fine on my Samsung Tablet.


Carlos Cetina wrote on 2021-12-01 UTC

Thank you very much, HG. It's a great improvement.

One of my biggest dreams is to see one day in the Google Apps Store one with which this chess variant can be played against the AI. Do you think that the Interactive Diagram software could be used in the Android environment?


H. G. Muller wrote on 2021-12-01 UTC

I have implemented the bishop conversion rule now as a standard feature of the Interactive Diagram. So that it is now also possible to play Symmetric Chess against the AI (for which the trick of changing both bishop's piece types when one of them moved did not work). All that is now required is define the bishop with an extra initial iW move, and add a parameter conversion=N, where N is the number of the piece table of the piece to which the rule applies. (So here N=3). The first moves of pieces of this type are then forced to go to different square shades.

files=9 promoChoice=NBRQ graphicsDir=../graphics.dir/alfaeriePNG/ whitePrefix=w blackPrefix=b graphicsType=png squareSize=50 symmetry=none conversion=3 pawn::::a2,b2,c2,d2,e2,f2,g2,h2,i2,,a7,b7,c7,d7,e7,f7,g7,h7,i7 knight:N:::b1,h1,,b8,h8 bishop::BiW::c1,g1,,c8,g8 rook::::a1,i1,,a8,i8 queen::::d1,f1,,d8,f8 king::::e1,,e8

Advanced Hexagonal Chess. Hexagonal variant that has no equal.[All Comments] [Add Comment or Rating]
Max Koval wrote on 2021-11-29 UTC

It is ready to be published.


Pandemonium (Surajang修羅場). Capablanca chess + Crazyhouse.[All Comments] [Add Comment or Rating]
Daphne Snowmoon wrote on 2021-11-29 UTC

Piece list added !


Chess with Different Queens. players choose their super pieces.[All Comments] [Add Comment or Rating]
B.E. Dolata wrote on 2021-11-28 UTC

H.G. Muller, thanks for the comments. I've also been doing some testing in ChessV.

White: Queen, Black: Queen
White wins: 94
Black wins: 93
Draws: 113
White: Griffon, Black:
White wins: 177
Black wins: 48
Draws: 75

I'm currently running test on the Archbishop and Chancellor.

The Queen-Griffon was matchup is fairly lopsided in the simulations, but its close enough that that I still found it fun to play myself. I haven't tested the Griffon-Lion matchup yet either in the computer or over the board, but your results for the KaFafsW Lion make me think that it could be unplayable. I will run some tests with the Q2afsW after my current games finish running and see if this tones down the Lion sufficiently.


H. G. Muller wrote on 2021-11-28 UTC

I see that the Lion now has become a regular 2-step area mover. I tested a Lion that was blocked more easily (KaFafsW), because it was missing the Moa path and lame Dabbabah (nD), so that only the D move was multi-path (reachable in 2 ways), by pitting it against a Queen in Fairy-Max. To my surprise the lameness did not weaken it that much compared to a KNAD: it beat the Queen by 63% in 200 games, which is only slightly smaller than the Pawn-odds score.

The balance could still be improved a little by making every square on the 'second ring' reachable through a single path only. E.g. the A squares through the F squares, (as they already are), and all others through the W squares. So that it becomes a compound of a range-two Queen and a Xiangqi Horse (Q2afsW). That would most likely still leave it stronger than a Queen, while all other replacements are weaker than Queen.

I also tried the WyasW against a normal Griffon. It was only marginally stronger. I guess it suffers a lot from the fact that the paths cross on the F squares, which means that there now are 8 squares where two of its arms can be blocked. This makes the detour over the W squares nearly as much as a liability as an asset. Furthermore, it made the piece very difficult to develop; the initial F step is really useful for sneaking between Pawns. This was quite annoying, so I would not recommend use of this piece. and stick to the regular Griffon.


Terachess II. An unrealistic summit on a very large board of 16x16 squares and 128 pieces.[All Comments] [Add Comment or Rating]
Eric Silverman wrote on 2021-11-27 UTCExcellent ★★★★★

I've been playing a lot of this game recently (via Ai Ai), partly for my own enjoyment and partly as inspiration for my own 16x16 experiments. There are relatively few modern Chess variants played on 16x16, and for me, this game is the best example thus far.

The variety of pieces presented here is at first intimidating, but one soon realises there is a logic to everything presented here, and shortly thereafter you'll find the piece movements become natural. The balance of the initial position is excellent, with every piece finding its way into the fight without too much awkward development. Games are long -- against AI at 2 minutes/move my games take at least 400 plies, with my longest so far at 695 -- but as a large Shogi variant fanatic this doesn't bother me at all. Throughout those long games one will find drama, excitement, and plentiful opportunities for subtlety and subterfuge.

If I were very picky, I might say that I'd like to see the Rook + Camel/Bishop + Camel compounds in here, which I find really fun on a large board. Also the basic leapers -- Camel, Giraffe, Knight -- feel less impactful in a game this size. Having said that, everything works well together, and I enjoy this game tremendously.


Koval's Hexagonal Chess. (Updated!) A new way to play chess on hexagonal cells.[All Comments] [Add Comment or Rating]
Max Koval wrote on 2021-11-25 UTC

I clarified the ambiguity associated with the interpretation of the double-step rule and also emphasized the identity of the pieces' movement to other hexagonal variants. I will also add extra information, related to this variant in the near future.


Ben Reiniger wrote on 2021-11-24 UTC

I think it'd be worth adding some of that information into the page, the intro and/or notes sections. (E.g., "pieces move as in other standard [is 'standard' OK here?] hexagonal variants" and maybe "the board shape and setup are designed to be better balanced" in the intro, and the comparisons to other variants in the notes.)

The pawns' initial two-step could use a clarification on whether pawns that make an initial one-step but land still in the two-step "zone" are still admitted a subsequent two-step (it seems like yes?).


Chess with Different Queens. players choose their super pieces.[All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2021-11-23 UTC

From the description (both here and of the Sliding General), shouldn't it be a three‐path lame dabbabah?

Well, the description was KtfsF, so I assumed a W as second step was out.

Another enhancement I had considered was to just add the Wazir move to the existing Griffon pattern.

That was the first thing that came to my mind as well, but I was afraid this would make it too strong. IIRC the value for the Griffon I measured was 8.2, and 4 extra moves easily up the value by 2 Pawns, even for a Rook. Just bending a trajectory in another shape is more like adding extra squares at the end of the trajectory: all the normal Griffon move now become more easily blocked. This should partly compensate the effect.


Bn Em wrote on 2021-11-23 UTC

a King, a Xiangqi Elephant, a Xiangqi Horse and a two-path lame Dabbabah (XBetza KaFafsW).

From the description (both here and of the Sliding General), shouldn't it be a three‐path lame dabbabah? Including the possibility of two consecutive same‐direction Wazir steps. That'd give KaFafsfW or KaFafsWnD


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