Requesting another chess variant: Crazyhouse

Hi again ! i love chess 960 , could you add crazyhouse as well ? i know , im very needy, thx !

this has been discussed before. there is widespread interest but it is prohibitively difficult to add variants that cannot be described in png format.

I agree that crazyhouse would be an excellent variant to add, if it ever becomes practical. although good advice for you, myself, and anyone else who likes lichess and wants crazyhouse, bughouse, capablanca, etc, would be to learn to code and get involved in the open source software revolution.

ok thx for the answer! I didn´t know it had been discussed before, sorry.

no, its fine. the more interest there is in crazyhouse, the sooner someone will create a .pgnx file format that supports it. I am not a coder (yet), but I was thinking about the problem last night.

moves can occur on one board or the other, so the move list needs to specify what board it occurred on. there also needs to be a notation for a captured piece appearing on a square that specifies the color of the piece.

There is already pgn standard for bughouse/crazyhouse called "BPGN"
web.archive.org/web/20070927030540/http://www.bughouse.be/BPGN_Standard.txt

You can download many crazyhouse pgn from http://ficsgames.org/ to see how is written
for example http://ficsgames.org/cgi-bin/search.cgi?white=&colors=1&black=&rclass=0&rgroup=2&variant=11&comps=0&result=1&rtimeoperator=1&gtime=9999&rincoperator=1&ginc=9999&eco1=&eco2=&date-sel-after-dd=7&date-sel-after-mm=05&date-sel-after=2014&date-sel-dd=7&date-sel-mm=05&date-sel=2015&Games=Search

Also there is some crazyhouse viewer written in Javascript. For example http://ficsgames.org/cgi-bin/show.cgi?ID=375530181
http://chessforeva.appspot.com/SjengBoard.htm

"It is prohibitively difficult to add variants that cannot be described in pgn format." Several variants have already been added that cannot be described in standard pgn notation. This should really be no reason for it to be impossible to implement a variant, at least in some form or other.

I would look to existing implementations (e.g. FICS and ICC, which incidentally managed to implement this particular variant years and years ago) for some sort of standard on the notation.

Actually, Thibault just dropped chess.js, which was a major blocker. So lichess is in the long term going towards the direction of... wilder variants. :)

There is a big list of variants by level of expressed interest on GitHub github.com/ornicar/lila/issues/441 already, and Crazyhouse is on top. :P