The site has moved to a new server, and there are now some issues to fix. Please report anything needing fixing with a comment to the homepage.

The Chess Variant Pages

Enter Your Reply

The Comment You're Replying To
H. G. Muller wrote on 2019-11-21 UTC

This is a test for how the Interactive Diagram can be used for variants with extensive side effects to their moves, by means of an (optionally) custom-supplied JavaScript function WeirdPromotion(fromX, fromY, toX, toY, promotionType) embedded in the HTML of the page that contains the diagram. This function originally was intended for specifying promotions not covered by the normal promotion rules (based on the specified promotion-zone size and the promoChoice or promoOffset parameters). E.g. for when a contageous piece is captured, for implementing non-rectangular promotion zones, or for vetoing certain choices dependent on the board rank where the promotion takes place.

promoChoice=QNBR graphicsDir=../membergraphics/MSelven-chess/ whitePrefix=w blackPrefix=b graphicsType=png symmetry=none newClick=1 captureMatrix=.@6/"/"/"/"/" atomicCapture=0 pawn::::a2,b2,c2,d2,e2,f2,g2,h2,,a7,b7,c7,d7,e7,f7,g7,h7 knight:N:::b1,g1,,b8,g8 bishop::::c1,f1,,c8,f8 rook::::a1,h1,,a8,h8 queen::::d1,,d8 king::::e1,,e8

But the function can also be used to modify the board in squares not touched by the move ('side effects'). In Atomic Chess captures have a rather drastic side effect: the piece itself, and all surrounding non-Pawns of either color will disappear! The function WeirdPromotion supplied with this page takes care of clearing the board around the to-square in the required way. There is one snag: to cause disappearance of the capturer as well, it has to be erased on its from-square, as the routine is executed before the move is made. So clearing the to-square erases the capture victim, but the capturer will still be moved to it afterwards, and thus has to be erased pre-emptively.

Edit Form

Comment on the page Atomic chess

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.