Check out Alice Chess, our featured variant for June, 2024.

Enter Your Reply

The Comment You're Replying To
Sam Trenholme wrote on Fri, Feb 23, 2007 07:31 PM UTC:
As it turns out, the number of possible opening positions increases even faster than EXPTIME when Chess Variant boards get bigger and bigger.

From a message I posted to the old Yahoo group:

There are 1,440 setups in 8x10 chess where the queen is to the left of the queen.

If you add a single faerie piece, there are 12,600 setups for 9x8 chess (with the queen to the left of the queen).

If you add two of a single colorbound faerie piece, there are 36,000 possible 10x8 setups (with the queen to the left and all that). If you add two of the same piece which isn't colorbound, there are 63,000 possible 10x8 setups. If you add two non-colorbound pieces, such as the archbishop (bishop + knight) and the marshall (rook + knight), there are 126,000 possible setups.

126,000 setups vs. 1,440 setups. No wonder why so many more are playable.

We can go even further: If you add three unique non-colorbound pieces to FIDE chess on an 11x8 board, 1,360,800 possible setups (680,400 if we add two of one kind of piece and one of anothe kind of piece, such as two archbishops and a marshall). If we add four unique non-colorbound pieces to the FIDE mix on a 12x8 board, we have 16,329,600 starting positions with the queen to the left of the king. If we insist on making it two pairs of colorbound pieces to a 12x8 board (such as two camels and two camels + bishops), this restricts us: We have only 1,296,000 possible starting positions.

And, even further: If we have a 'Grand Chess'/Shogi setup on a 10x10 board, with the pawns on the third row and two sets of Capablanca Chess pieces (we discard the second king) behind the pawns, we have some 92,201,259,150,000 total possible setups (with the king on the right hand side).

It might take a while for the chess variant community to come with a full opening theory for each and evey one of the above setups. :)

- Sam

Edit Form

Comment on the page Complexity of Large Variants

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.