You are on the backup site for Any posts, moves, or other changes you make here will not be permanent, because the pages and database from the main site will be backed up here every midnight EST. Additionally, things may not be working right, because this site is also a testbed for newer system software. So, if you are not here to test, develop, or merely read this site, you may want to change .org to .com in the navigation bar and go to the main site.

The Chess Variant Pages

Enter Your Reply

The Comment You're Replying To
Fergus Duniho wrote on 2022-03-22 UTC

Attention Game Courier Developers

While working on a preset for Miller's Spherical Chess, I was using the problem composer to set up positions for testing whether the pieces had the correct moves. While doing this, I happened to have the white King on h1 while testing its powers of movement, and it had nine moves highlighted as legal. I eventually figured out that it was counting the castling moves as legal even though I had no Rooks on the board.

To fix this, I replaced this code:

setflag a1 a8 h1 h8 e1 e8;

with this code, which conditionally checks whether the right piece is on each space before setting the flag.

if == K space e1:
  setflag e1;
if == R space a1:
  setflag a1;
if == R space h1:
  setflag h1;
if == k space e8:
  setflag e8;
if == r space a8:
  setflag a8;
if == r space h8:
  setflag h8;

The reason the King was getting an extra legal move on h1 is because h1 was flagged for the Rook. When I tried the King on g1, it had only 8 legal moves. By setting each flag conditionally, a problem will not allow castling unless a King and Rook are in the right positions for castling. I have made this change to the Chess preset, and with appropriate modifications, it should be made for any preset that allows castling and uses flags to control when castling is allowed.

Edit Form

Comment on the page How to Enforce Rules in Game Courier

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.

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.