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This item is a reference work
It belongs to categories: Orthodox chess, 
It was last modified on: 2020-07-18
 Author: Greg  Strong. Castling Rules in Chess Variants. An investigation of castling rules in chess and chess variants.[All Comments] [Add Comment or Rating]
Greg Strong wrote on 2020-07-18 UTC

I finally got around to updating this to incorporate the various suggestions and corrections.

  • Added a section on how castling is described in XBetza notation

  • Added examples where the castling move is preserved, but with pieces other than king and/or rook. In Knightmate, the knight castles instead of the king. In CwDA, the king castles with pieces other than rooks. I also mentioned the exception for castling with a colorbound piece with the Colorbound Clobberers.

  • Updated the first occurrence of Fast Castling to Wide Chess

  • Fixed the text size issue in the History of Castling section by eliminating the HTML table. Did not need to use Flexbox, thankfully, because I have not had time to get my mind around that yet (although it looks interesting.)


Fergus Duniho wrote on 2020-05-09 UTC

I moved this page and its graphics to the /terms/ directory.


Aurelian Florea wrote on 2020-05-06 UTC

I have deleted everything in all my fast castling presets (they did not work anyway) and from the regular castling rules for waffle chess. I am sorry for any inconvinience.


Greg Strong wrote on 2020-05-05 UTC

There is also a waffle chess preset with regular castling that was used for some games.

My thought here is to edit this preset and remove the rule enforcement (assuming the games are complete.)  This way the games will still be available and people can view them, but if people go to create a game with the preset it will give the warning "Uncoded. No rules enforced. No legal moves displayed."


Aurelian Florea wrote on 2020-05-05 UTC

The help I was requiring  was to change the name of those presets. As this is no longer needed nor is the help. Just thank you for clearing what fast castling and free castling means.

About the presets with altered rules I understand why my way is confusing. There is also a waffle chess preset with regular castling that was used for some games. Tomorrow I'll find a way to avoid said confusion.


Greg Strong wrote on 2020-05-05 UTC

With frog chess and hannibal chess I am deviating from the rules, indeed this is what I want to say.

Please do not do that.  That creates confusion for you to create a rule-enfocing preset that does not enforce the correct rules for the game.  If you want to play-test an alternate version with game courier, but you should either (A) change the name of the game "Frog Chess with Fast Castling" or something like that, or (B) do your playtesting without rule enfocement.

I do not know how to correct these errors. Could you help, please?

I am not sure what you are asking for help with.


Aurelian Florea wrote on 2020-05-05 UTC

It seems then I am ok with the fast castling rule. I was in error the second time. 

With frog chess and hannibal chess I am deviating from the rules, indeed this is what I want to say.

I hope that settles things.


Greg Strong wrote on 2020-05-05 UTC

Greg, fast castling in the waffle chess preset is a mistake of mine. It supposed to be free castling.

Why do you think that?  Kevin's page does not describe free castling - it says it does not matter if the squares in between are occupied and the rook always goes to the king's starting square.  This is fast castling, not free castling.

This mistake appears also in the frog chess and Hannibal chess where I am writing a preset for such a variation of the rules.

I do not understand what you are saying.  Frog and Hannibal have Standard castling.  Or are you saying you want to deviate from the rules and make presets with fast castling anyway?


Aurelian Florea wrote on 2020-05-05 UTC

Greg, fast castling in the waffle chess preset is a mistake of mine. It supposed to be free castling. This mistake appears also in the frog chess and Hannibal chess where I am writing a preset for such a variation of the rules. I do not know how to correct these errors. Could you help, please?

 


Greg Strong wrote on 2020-05-04 UTC

Ok, that's why I didn't see the name "fast castling" on the waffle chess page.  I will fix it.


Kevin Pacey wrote on 2020-05-04 UTC

It may be worth noting that the first variant invention of mine that used 'fast castling' rules was my 12x8 Wide Chess creation.


Greg Strong wrote on 2020-05-04 UTC

H.G., I'm not familiar at all with castling in XBetza but it does seem like something that should be included.  If you don't mind writing up a section on that I'd certainly put it in.


Greg Strong wrote on 2020-05-04 UTC

Thanks guys.  I'm back to work so I won't be able to look at this until this evening at the earliest.


H. G. Muller wrote on 2020-05-04 UTC

Some remarks:

'Castle' in Xiangqi is really unusual; in almost every description in English I have seen, the 3x3 area is called 'Palace'.

Shogi does not have a castling move, but almost every text on Shogi strategy will tell you that the first thing you have to do in the game is 'castling', and then describe a large number of castle formations, usually with the King in or near a corner. I am not sure if we should refer to this different meaning of 'castling' in Shogi. Perhaps we could add a sentence that a 'castle' is a defensive constellation of pieces around the King near a corner (e.g. after you mentioned that the increased piece power made a centralized King unsafe). And that in Chess moving your King there (either through a special leap or the slow way) would trap the Rook, so that a single move has been provided to get the King in the corner without trapping the Rook in Chess. (In Shogi the corner piece of course is a Lance, which is trapped on the edge file by its own move, and it is usually integrated in the castle.

Fergus already remarked this: in some variants castling with pieces other than Rooks is possible. This should certainly be mentioned.

In the description of Fast Castling you don't mention whether it is allowed if any of the squares the King leaps over is under attack.

Perhaps we should mention something about notation for flexible/free castling (recommend one)?

Since you mention the terminology used in the ChessV option, you could perhaps also mention the XBetza notation for these types: O = castling, jO = close-rook castling, (usually prefixed with 'is' to stress that it is a sideways virgin-only move), the range indicator specifies the number of King steps, for flexible castling all possible castlings are mentioned separately. (XBetza does not support free or fast castling yet. I assume this would have to be done as a different atom, say S, because it is sort of a King-Rook swap. Where free castling would be nS (non-jumping), and fast castling S.)

ChessV's designation 'long' for Janus-Chess castling conflicts with the more common use of "long" for Q-side castling. I usually say 'asymmetric castling' when I refer to Janus Chess, although writing this makes me realize that I might as well call it 'symmetric castling', as the end result is the same K-side and Q-side. Perhaps 'symmetrized castling' would describe it best. In XBetza notation I have to define castling to the left and to the right as separate moves in Janus Chess (irO3 and ilO4). And because the setup is mirror-symmetric, left and right are swapped for black, meaning that the white and black King have different moves. Very annoying! In the Interactive Diagram I added an option castleFlip for this that automatically swaps the meaning of l and r on black castling specifications, so that the Kings can still be considered the same piece type. (Perhaps the meaning of l and r should always be swapped for black pieces in games with mirror-symmetric setups???)

 


Fergus Duniho wrote on 2020-05-04 UTC

I did a little bit of proofreading and did some minor corrections of typos, punctuation, grammar, and word choice.

I didn't add capitalization or ending periods, though I'm wondering if you would like to add them. I noticed that The History of Castling section used a smaller font because you used a table. I have started using flex boxes instead of tables, but I didn't touch your HTML.

When I was programming castling subroutines for Game Courier, I made them agnostic about the identity of the two pieces castling. One game that comes to mind where this is useful is Chess with Different Armies. In that game, a King may castle with whatever piece in its army begins in the corners. Maybe you could add something about games that allow castling with pieces other than rooks or even the king if there are any.

 


Fergus Duniho wrote on 2020-05-03 UTC

Very good. It could use a little proof-reading, which I could do later.


Greg Strong wrote on 2020-05-03 UTC

I have created the page on castling as discussed in another thread.  The graphics are original.


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