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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 2012-03-07 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 2010-08-27 UTC
Statement 2 is the correct one. See the illustration at

[Subject Thread] [Add Response]
Doug Chatham wrote on 2010-02-24 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 2010-02-06 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 2009-04-10 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 2009-01-11 UTC
Larry: Oh,ok.

Doug Chatham wrote on 2009-01-11 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. Taking the two most famous Fairies into Capablanca. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]
Doug Chatham wrote on 2008-11-21 UTC
Well, if you want a 'stereotypical' chess variant, you'll need to get rid of en passant capturing and promotion to pieces not already captured. Those two changes seem to be common reflexes.

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Doug Chatham wrote on 2008-10-30 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 2008-10-17 UTC
Can the Mad King move to a square that is defended by an opposing piece?

N-Plus-K Queens Problem PageOne or more fairy chess problems
. Missing description[All Comments] [Add Comment or Rating]
Doug Chatham wrote on 2008-09-16 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 2008-06-25 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 2008-06-13 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 2008-05-21 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 2008-05-20 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 2008-04-27 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 2008-04-23 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.

[Subject Thread] [Add Response]
Doug Chatham wrote on 2008-04-13 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 2007-12-03 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 2007-11-28 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 2007-11-18 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 2007-10-09 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 2007-10-05 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 2007-10-04 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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