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H. G. Muller wrote on Thu, Apr 30, 2009 08:17 AM UTC:

I encountered two variants which seem not yet decribed on the CVP:

MiniChess / SpeedChess, wich is played on a 5x6 board, and even has a
described sub-variant MiniChess 2007 which adds a color-swap non-capture
move to the bishop:

http://wiki.cs.pdx.edu/cs542-spring2007/mini-chess/rules.html

The other variant is Twilight Chess, a variant with piece drops:

http://membres-lig.imag.fr/prost/Twilight_Chess/index.html

This latter variant seems of fundamental interest, as it decouples the
problem of handling drops from the problem of how to handle quiescence
search (which makes variants like Shogi and Crazyhouse so difficult): the
holding from which you can make drops is not filled by captures, but you
can move pieces there voluntarily.

Greg Strong wrote on Thu, Apr 30, 2009 11:01 PM UTC:

Twilight chess is interesting.  I think the page is not quite clear how the
50-move draw rule works with pawn warping.  I guess, technically, warping a
pawn is moving a pawn, so it resets the 50-move counter.  But pawn moves
normally reset the counter because they are non-reversable.  Now I guess
all pawn moves are reversable because warping allows them to go backwards. 
I'm not sure I like this.  The non-reversability of pawn moves is one of
the defining characteristics of Chess.

H. G. Muller wrote on Fri, May 1, 2009 07:36 AM UTC:

I guess the problem is similar to that in Shogi and Crazyhouse. I am not
sure these games even have 50-move rules.

Greg Strong wrote on Fri, May 1, 2009 12:02 PM UTC:

Shogi does not.  Not sure about Crazyhouse.

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