Check out Janggi (Korean Chess), our featured variant for November, 2024.

Enter Your Reply

The Comment You're Replying To
Matteo Perlini wrote on Tue, Dec 4, 2012 08:40 PM UTC:
Mats, thanks. This solves part of the problem. The whole solution is this one:

(define shift1-check (
(set-flag found false)
START
(while (and (on-board? next) (not-flag? found))
(if (and (piece? King) friend?) (verify attacked?) (set-flag found true))
next
) (verify (flag? found))
back
$1
(verify not-friend?)
(set-flag found? false)
add
))

 But, the problem is the huge computational complexity of this implementation. It takes some seconds just to calculate the movable pieces. So this solution is not a practical one.

I have tried to implement a solution with a dummy piece that check whether there is an attacked king, if so move a dummy piece. But it seems I don't know some basic concepts.

At the end of each players' moves, I want the dummy player do that:
- clear the position "king-check"
- scan all the boar
- if the king is attacked, then create a marker in position "king-check"

This is what I have implemented:

(define checking
(
cascade
(capture king-check)
add
(set-flag found false)
START
(while (and (on-board? next) (not-flag? found))
(if (and (piece? King) friend?) (verify attacked?) (set-flag found true))
next
)
(verify (flag? found))
back
(create Marker king-check)
)
)

Unlucky this solution doesn't work. Any ideas? :-)

Edit Form
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.
Avoid Inflammatory Comments
If you are feeling anger, keep it to yourself until you calm down. Avoid insulting, blaming, or attacking someone you are angry with. Focus criticisms on ideas rather than people, and understand that criticisms of your ideas are not personal attacks and do not justify an inflammatory response.
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.