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Caïssa Britannia. British themed variant with Lions, Unicorns, Dragons, Anglican Bishops, and a royal Queen. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2022-11-24 UTC

Okay, it's looking good.

H. G. Muller wrote on 2022-11-24 UTC

@Fergus: I have moved the Interactive Diagram that was somewhere down in the comments section into your article, replacing the diagram of the initial setup. (Your original image is still there, within <noscript> tags for those who have JavaScript disabled.) It tried to mimic the original image as much as possible, without resorting to a dedicated background image of the whole board. I hope this is OK with you.

(N.B. Flush the browser cache to use the latest Diagram script, as the previous one did not 'bleach' the dark color for the odd files when displayiong a move diagram.)

Greg Strong wrote on 2022-09-24 UTC

You can play this with the latest ChessV release candidate: ChessV 2.3 RC2

Just unzip and run the EXE.

David Haft wrote on 2022-09-24 UTC

The ZoG file doesn't seem to work, giving error 'The following bitmap couldn't be loaded: "images\boards\rwb10x10bmp" '

If you could advise on a fix, I'd love to play this

Aurelian Florea wrote on 2020-11-14 UTC

@Fergus, For this game is perfect, the way you did it. I meant as an option. I see it better is 4 colors when I move knight riders. At least on a 12x12. That is it, and it is not possible anyway with the interactive diagram. It is possible with presets and tried a picture and liked it.

Fergus Duniho wrote on 2020-11-14 UTC

and for myself in another how do I do it with 4 shades -yellow and silver not just silver with yellow at the same ranks as cherry and silver at the same ranks with dark blue- although I know Fergus does not consider this necessary

I consider it not just unnecessary but undesirable. I already tried Cavalier Chess with four colors back when I created it, and it was harder to make sense of than a three-color board. Besides that, this game's board uses the three colors of the British flag. Any fourth color would be arbitrary and make the board look less British.

H. G. Muller wrote on 2020-11-14 UTC

Extra shades is not a standard feature of the diagram, in the sense that it cannot be specified by a parameter in the Diagram definition, like startShade=.... can specify an alternative darkShade for making the diagram look nicer when it hasn't been used yet. The script does have an internal variable, though, that you can set by adding extra JavaScript on the page, like

      <script>oddShade = "#E04040";</script>

This would define an alternative startShade for the dark squares with odd coordinates.

There is no provision for an alternative lightShade.

Aurelian Florea wrote on 2020-11-14 UTC

HG, I still have not understood how you implemented the three shades or how I would implement 4 shades :)!

Aurelian Florea wrote on 2020-11-14 UTC

Found it. Thanks Kelvin!

KelvinFox wrote on 2020-11-14 UTC

It does have one in the comments

Aurelian Florea wrote on 2020-11-14 UTC

This game does not yet an interactive diagram, despite being a popular game here. @HG, Should I attempt one how do I write the shades function for this one (and for myself in another how do I do it with 4 shades -yellow and silver not just silver with yellow at the same ranks as cherry and silver at the same ranks with dark blue- although I know Fergus does not consider this necessary)?. Also for the Royal piece what should I do? I remember you guiding wdtr2 in something similar.

Fergus Duniho wrote on 2019-11-16 UTC

Done, and I moved the ASCII diagram to the ALT text of the image.

Greg Strong wrote on 2019-11-16 UTC

The graphic diagram on this page is very small for some reason.  Don't think it was always that way.  I will fix in a few days if Fergus doesn't.

Calvin Daniels wrote on 2019-11-16 UTC

Love the rebuild of chess. It's less a variant and more a unique offering, like shogi as example.

I'd say two things surprised me. In changing almost every piece on the board was there any thought of a different approach to the pawn?

And, of more interest, doing something to save te knight from its 'pasted on feel', the only real disappointment with the game so far? It woul be rare that promotion to a knight would be a better option than a taken piece IMO so I doubt knights get much play.

Perhaps making them a 'Veteran Knight' knight/camel combined move would help.

Or, allowing promotion to a knight on 8 and 9 row, to anything captured in 10th. In that was a knight might be better option as it arrives to the fray earlier.

Just a couple of thoughts.

Fergus Duniho wrote on 2019-02-03 UTC

Since a royal Queen cannot move through check, it can be checkmated in many of the same positions that would checkmate a King. For example, if a Rook or Bishop is checking it from more than one space away, it cannot capture the checking piece. If you replace it with a royal Chancellor, that piece now has up to 12 possible leaping moves, which is more than the royal Queen has. However, this is fewer than the royal piece in Cavalier Chess has, and checkmate is doable in that game. The main thing would be to design the army to complement the powers of the royal Chancellor. Extra diagonal pieces might be helpful, since it's going to be vulnerable to diagonal attacks. Maybe pieces with Camel or Zebra powers would be helpful too.

wdtr2 wrote on 2019-02-03 UTC
Reply to Kevin Fox's statement:

The Queen as a royal makes it harder to get it into checkmate IMO.  Making the chancellor royal would make it even harder to obtain checkmate.  Imagine the queen on rank 8, and 2 enemy rooks on rank 8 and 7.  The queen can attack the rook on rank 8, and the rook on rank 7 is acting as a barrier so that the queen must stay on rank 8.  If the rook on rank 8 is protected it is checkmate.  If we replace the queen with chancellor, the chancellor can escape with a horse movement to rank 6.  I think if you made the chancellor a royal, a lot of games would be drawn, due to lack of pieces to make a check, or the 50 move rule.  A royal chancellor has an improved ability to escape and move out of checkmate.


KelvinFox wrote on 2019-02-01 UTC

I wonder if German chess (with chancellor as the royal piece) would be a viable game

Kevin Pacey wrote on 2018-03-01 UTCExcellent ★★★★★

A fresh idea for a variant that at first made me wonder if the game was truly playable. The answer is a resounding yes!

Fergus Duniho wrote on 2017-08-18 UTC

Okay, that makes sense. In other words, a Queen cannot pass through check, because another piece could capture it while it is on the move, as it passes by so to speak, not just when it has reached its destination, and this is the same kind of thing that is happening when a Pawn is captured en passant.

H. G. Muller wrote on 2017-08-17 UTC

More generally 'en passant' (french for 'while passing') means that you capture a piece not on the square where it is, but on a square it passed through on the preceding move. In orthodox Chess Pawns can capture other Pawns en passant, and any piece can capture a King en passant (which, due to the rule that it is not legal to expose your King to capture, then means you cannot pass through check, and only applies to castling, as normal King moves never pass through anything).

In Caissa Britannia the royal piece does have normal moves that do pass through other squares.

Fergus Duniho wrote on 2017-08-17 UTC

H. G., what do you mean by "the interpretation that the Royal Queen can be taken en passant by any other piece"? As I understand the term en passant, all it applies to in this game is one Pawn capturing another.

Daniel wrote on 2017-07-08 UTC

What if we use the Chu Shogi Lion?

magneton wrote on 2016-12-13 UTC

colour-switch bishop amazing idea what is its relative value if we changed it with colour-bound bishop in fide chess is same as rook or less  

Aurelian Florea wrote on 2016-10-08 UTC


I think the bishop is named anglican, not angelican!

Fergus Duniho wrote on 2016-07-22 UTC

T.R. Dawson didn't invent the leo. You must be confused with the grasshopper

Maybe I missed this comment earlier. I didn't confuse it with the Grasshopper. In A Guide to Fairy Chess, Anthony Dickins writes,

Now we meet a small family of pieces that must hop in order to capture over one man of either colour to any square beyond that man on the same line; but when not capturing, they move on their normal designated lines. The LEO moves like a Queen, the PAO moves like a Rook and the VAO moves like a Bishop. They were introduced by T. R. Dawson from Chinese Chess, probably before 1914. (p. 11)

Since the Leo and the Vao are not actually in Chinese Chess,  the assumption here is that he invented these pieces. If anyone has a reference to an earlier creation of the Leo, I would be happy to see it.

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