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Comments by Doug Chatham

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Rules of Chess FAQ. Frequently asked chess questions.[All Comments] [Add Comment or Rating]
Doug Chatham wrote on Wed, Mar 7, 2012 12:22 PM UTC:
Article 3, section 9 of the FIDE Laws of Chess:

3.9         The king is said to be 'in check' if it is attacked by one or more of the opponent's pieces, even if such pieces are constrained from moving to that square because they would then leave or place their own king in check. No piece can be moved that will either expose the king of the same colour to check or leave that king in check.

Ultima. Game where each type of piece has a different capturing ability. (8x8, Cells: 64) (Recognized!)[All Comments] [Add Comment or Rating]
Doug Chatham wrote on Fri, Aug 27, 2010 01:17 PM UTC:
Statement 2 is the correct one. See the illustration at

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Doug Chatham wrote on Wed, Feb 24, 2010 11:28 AM UTC:
Rich, if you'll look at the page Joe mentioned, you'll see 'You are
viewing ratings based on a wildcard that includes all Chess variants played
on Game Courier. This is not as meaningful as ratings based on a single
variant, which you may find by clicking on the Ratings link above the board
in a preset.'

Ferz. Moves one diagonally.[All Comments] [Add Comment or Rating]
Doug Chatham wrote on Sat, Feb 6, 2010 06:59 PM UTC:
This chart has names for chess pieces in 73 languages:

Chess. The rules of chess. (8x8, Cells: 64) (Recognized!)[All Comments] [Add Comment or Rating]
Doug Chatham wrote on Fri, Apr 10, 2009 01:46 PM UTC:
Hunter: No, a king cannot move two spaces to kill a piece.

Xiang Hex ZIP file. Missing description[All Comments] [Add Comment or Rating]
Doug Chatham wrote on Sun, Jan 11, 2009 11:36 PM UTC:
Larry: Oh,ok.

Doug Chatham wrote on Sun, Jan 11, 2009 01:33 PM UTC:
John, all chess variants are one-dimensional. For example, see EEEEEEEEEEEEEEX! Chess, the one-dimensional expression of FIDE Chess, on this page. :-)

Chess Variant. Private Taking the two most famous Fairies into Capablanca. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]

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Doug Chatham wrote on Thu, Oct 30, 2008 01:57 AM UTC:
Werewolf: Moves like a Man except on moves 10,20,etc, during which they
move like some monstrously powerful piece, an Ubi-ubi, maybe?

Mad King Chess. Missing description (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
Doug Chatham wrote on Fri, Oct 17, 2008 01:57 PM UTC:
Can the Mad King move to a square that is defended by an opposing piece?

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Doug Chatham wrote on Wed, Oct 15, 2008 08:14 AM UTC:
More of the same

N-Plus-K Queens Problem PageOne or more fairy chess problems
. Missing description[All Comments] [Add Comment or Rating]
💡📝Doug Chatham wrote on Tue, Sep 16, 2008 04:32 PM UTC:
The Sept. 5 issue of Science has a short article describing this problem.

45 or 46 Cell Contest - 2007 Design Contest. Quick contest for 45 or 46 cells. Deadline for Submissions: November 30, 2007.[All Comments] [Add Comment or Rating]
Doug Chatham wrote on Wed, Jun 25, 2008 01:10 PM UTC:
Would you update us on the progress of the judging for this contest?

King's Guard Chess. Pawns move like kings and only Pawns may capture. (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
Doug Chatham wrote on Fri, Jun 13, 2008 02:26 PM UTC:
What happens if I capture the opponent's last pawn on the last row with my last pawn, which must immediately promote since it's on the last row? More generally, what happens if both players achieve a losing condition at the same time?

The FIDE Laws Of Chess. The official rules of Chess from the World Chess Federation.[All Comments] [Add Comment or Rating]
Doug Chatham wrote on Wed, May 21, 2008 10:01 AM UTC:
Article 9.3 of the Laws of Chess says 'Declaring a check is not obligatory.' So, you weren't even required to say 'check', much less 'checkmate'.

Mutators. Article discussing the concept of Mutators.[All Comments] [Add Comment or Rating]
Doug Chatham wrote on Tue, May 20, 2008 10:44 AM UTC:
Do you have any example of an atomic mutator? It seems to me that all mutators are composite: for example, [Pass] could be factored as [Pass, if White][Pass, if not White].

Rules of Chess FAQ. Frequently asked chess questions.[All Comments] [Add Comment or Rating]
Doug Chatham wrote on Sun, Apr 27, 2008 04:29 PM UTC:
Yes, promoted pawns can be immediately captured after promotion. The opponent is not required to wait. See the Pawn FAQ page for more details on the question 'Can promoted pieces be captured directly after promotion?'.

Chess. The rules of chess. (8x8, Cells: 64) (Recognized!)[All Comments] [Add Comment or Rating]
Doug Chatham wrote on Wed, Apr 23, 2008 10:55 PM UTC:
To the person who is confused by the 'one and one' knight's move description:

Read the description of the knight's move again. It's one horizontally or vertically, and then one diagonally. The 'one and two' description you're thinking of doesn't mention diagonal movement -- it's one vertically, then two horizontally or it's one horizontally, then two vertically.

Both descriptions get the knight to the same places.

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Doug Chatham wrote on Sun, Apr 13, 2008 02:39 PM UTC:
Maybe in a few years, we'll be able to 'print' the board and pieces using a 3-dimensional printer like the one described on this video:

Penturanga. Chaturanga on a board with 46 pentagonal cells. (8x5, Cells: 46) [All Comments] [Add Comment or Rating]
Doug Chatham wrote on Mon, Dec 3, 2007 06:40 PM UTC:
The old CVP-linked pentagonal game that you mentioned, is it Webball, which is played on a dodecahedron?

Variants with Queens. Some variants, mostly dealing with queens, and mostly modest. (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
Doug Chatham wrote on Wed, Nov 28, 2007 05:51 PM UTC:
Nice list. Here's another suggestion:
Deposable queen (Cinderella? Were-Queen?): If a promoted Queen crosses or lands on its side's second rank, it turns back into a pawn.

Ninety-one and a Half Trillion Falcon Chess Variants. Missing description[All Comments] [Add Comment or Rating]
Doug Chatham wrote on Sun, Nov 18, 2007 09:16 PM UTC:
Joe Joyce,
See this page for a description of what a 'mutator' is.

Black Holes. On 5 by 8 board with holes as pieces which also can be used for transport. (5x8, Cells: 40) [All Comments] [Add Comment or Rating]
Doug Chatham wrote on Tue, Oct 9, 2007 09:02 PM UTC:
I guess the S is short for 'Springer', the German word for 'knight', or something similar.

Bland Chess. Chess with no diagonal moves. (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
Doug Chatham wrote on Fri, Oct 5, 2007 11:47 PM UTC:

'Bland Chess' seems to me to be an unfortunate name. If Taxicab weren't taken, I'd suggest 'Taxicab Chess' since the rules remind me of taxicab geometry. Unfortunately, I don't have a better alternative. ('SNEW Chess'? 'Straight and Narrow Chess'?)

Is there a variant where the pieces are only permitted to move to, say, white squares? (I suppose there have to be an extra rule to force the White King off its black square so it could be threatened.)

Fluid Chess. A modest variation allowing movement through friendly pieces. (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
Doug Chatham wrote on Thu, Oct 4, 2007 02:49 PM UTC:
If you're going to divide pieces into their directional components, I suggest that you also make the captures kamikaze.

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