Check out Glinski's Hexagonal Chess, our featured variant for May, 2024.

Enter Your Reply

The Comment You're Replying To
Greg Strong wrote on Sun, Jan 24, 2021 12:24 PM UTC in reply to Robert Mate from 07:59 AM:

If you're deriving from one of the board-size specific games then there are shortcuts to enable these easily. But the options vary depending on the board size, so for unusual sizes it is a little more work.

You can look at the include file for Duke of Rutlands Chess for an example but here are the relevant bits. For castling, conventional chess would be:

            AddCastlingRule();
            CastlingMove( 0, "e1", "g1", "h1", "f1", `K` );
            CastlingMove( 0, "e1", "c1", "a1", "d1", `Q` );
            CastlingMove( 1, "e8", "g8", "h8", "f8", `k` );
            CastlingMove( 1, "e8", "c8", "a8", "d8", `q` );

The arguments to CastlingMove are: player (0 or 1); the square the king starts on; the square the king ends on; the square the other piece starts on; the square the other piece ends on; and a single character specifying what letter should be placed in the FEN to represent the availability of this move.

For the two-space pawn move, in chess it would be:

    Pawn.AddMoveCapability( MoveCapability( <1, 0>, 2, 2, false, false ) ).Condition = { location: location.Rank == 1 };

The last bit, { location: location.Rank == 1 } is a lambda function taking a location and returning true or false specifying where on the board this new move should be available.  Ranks are counted starting at zero, so Rank == 1 means whenever on the second rank.  The arguments sent to the constructor of MoveCapability are: the direction of the move, <1, 0> means rank offset of 1 and file offset of zero; minimum number of steps; maximum number of steps; is capture allowed; and is capture required.  We did not set the minimum number of steps to 1 because the pawn already has a single-space move and we don't want to generate it twice.

Finally, if you want en passant, just set EnPassant = true in your SetGameVariables function.


Edit Form

Comment on the page ChessV

Conduct Guidelines
This is a Chess variants website, not a general forum.
Please limit your comments to Chess variants or the operation of this site.
Keep this website a safe space for Chess variant hobbyists of all stripes.
Because we want people to feel comfortable here no matter what their political or religious beliefs might be, we ask you to avoid discussing politics, religion, or other controversial subjects here. No matter how passionately you feel about any of these subjects, just take it someplace else.
Quick Markdown Guide

By default, new comments may be entered as Markdown, simple markup syntax designed to be readable and not look like markup. Comments stored as Markdown will be converted to HTML by Parsedown before displaying them. This follows the Github Flavored Markdown Spec with support for Markdown Extra. For a good overview of Markdown in general, check out the Markdown Guide. Here is a quick comparison of some commonly used Markdown with the rendered result:

Top level header: <H1>

Block quote

Second paragraph in block quote

First Paragraph of response. Italics, bold, and bold italics.

Second Paragraph after blank line. Here is some HTML code mixed in with the Markdown, and here is the same <U>HTML code</U> enclosed by backticks.

Secondary Header: <H2>

  • Unordered list item
  • Second unordered list item
  • New unordered list
    • Nested list item

Third Level header <H3>

  1. An ordered list item.
  2. A second ordered list item with the same number.
  3. A third ordered list item.
Here is some preformatted text.
  This line begins with some indentation.
    This begins with even more indentation.
And this line has no indentation.

Alt text for a graphic image

A definition list
A list of terms, each with one or more definitions following it.
An HTML construct using the tags <DL>, <DT> and <DD>.
A term
Its definition after a colon.
A second definition.
A third definition.
Another term following a blank line
The definition of that term.