Adding new variants

If a chess variant is implemented at www.chess.com, then should its engine also be implemented for computer analysis? I see that Trice's chess is implemented at www.chess.com right now but computer analysis is only available for orthodox chess but I may be wrong. Developing game rules is very easy, but the engine is really hard.

If engine is not compulsory for a chess variant, then I would be interested in writing Javascript code for 30 or so chess variants with fairy chess pieces and hexagonal boards (if not for 3D boards) that can be implemented at www.chess.com so that the online chess website with largest player base in the world will be able to try out and play them with (if not at www.jocly.com and www.pychess.org which has always got with very lesser enough number of active players as base).

Some of chess variants that do not require coding new rules, but can be implemented instantly because they can be set up with the existing features of chess variants are:
(1) Musketeer chess (2) Metamachy (3) Grand chess (4) Wildebeest chess (5) Shako (6) Tutti-frutti chess (7) Gustav III chess (8) Courier chess (9) Duke of Rutland chess (10) Reformed courierspiel (11) Carerra chess (12) Janus chess (13) Chancellor chess (14) Modern chess (15) Hyderabad decimal chess (16) Kaiserspiel (17) Sultanspiel (18) SimChess (19) Amazon chess (20) Makruk (21) Sweet 16 chess (22) Romanchenko's chess (23) Xiangqi (24) Cylinder chess (25) Wild tamerlane chess (26) Gigachess (27) Terachess (28) 4 board chess (29) Rollerball chess (30) Capablanca chess
These are played with size of chess board ≥ 8×8 and are sorted from the most interesting to the least interesting.
And white wins every time in Capablanca Chess due to the defects in the starting position.

Would it be possible to create a custom-960 setup? ( between  if castling, on opp squares if any bishops, and pre-set pieces otherwise randomly set up)

yes, ANYTHING IS POSSIBLE HERE as long as the staff agree to it.

Many of players over hereby request for custom 960 setup. It will take some time for the www.chess.com developers to consider all those requests which come from many players and implement it over hereby. (However that this does not require coding new rules or new fairy pieces or board shape to consider for AI).
If anyone over hereby want to try out custom 960 setup right now without waiting for www.chess.com developers to implement it over hereby, then there is Placement chess at www.pychess.org. Unlike www.chess.com and www.lichess.org, chess variants over thereby are less popular and human players will occasionally come to play for a rated game. Most of the time anyone ends up trying out unrated games with AI, although AI there is quite strong especially level 8 and there are 8 levels of AI difficulty to play with any chess variant over thereby (unlike www.jocly.com demonstration page at https://mi-g.github.io/jocly/examples/browser/control.html?game=metamachy-chess which has only weak AI of single difficulty level to try out with for all of two player strategy board games available over thereby).
115 two player strategy board games and none of them involving any element of chance such as those like dice, playing cards, toss of coin, luck of draw, etc. were available for play at www.jocly.com during 2017-2018 until on Wednesday, 24 October 2018 www.jocly.com got completely shut down due to confiscation of game server by attackers.
Today that www.jocly.com got open again but the game server is detached making it impossible to play any of types of new games or review any of types of old games. Yet that it is still however possible to co-ordinate two player strategy board games at https://jocly.jcfrog.com/joclymatch/gamespanel.php, but anyone with the game link can make the move for side of white side or black side and not necessarily the two players involved within playing of that game.
www.lidraughts.org contains some collection of checkers variants unlike www.lichess.org and www.pychess.org which are exclusively dedicated for chess variants but that I find out any variant of checkers to be boring because all of pieces in any of checkers variant is the same unlike that of any of variant of chess.
www.pychess.org and www.lidraughts.org are heavily AI-based so that development of AI should be given first and foremost priority, any new variant of chess or checkers developed over thereby.
May be that www.pychess.org and www.lidraughts.org are branches of www.lichess.org with such chess variants and with such checkers variants that are kept separate from www.lichess.org. www.pychess.org and www.lidraughts.org have very little player base and neither they seem to be related to www.lichess.org nor they seem to be owned by www.lichess.org.

https://ancientchess.com/page/play-courier-chess.htm

This is one interesting

that one i've has been waiting on the list for a while already, given we have everything to set this up. it's on now https://www.chess.com/variants/courier-chess

Missing an icon.. and unsure about stalemate rule, made it a win like chaturanga.

oh, thank you!

Well, I think stalemate can count as a victory, like in the medieval rules

courier chess and racing kings has been added

There have been a handful of variants played "in the forum". 

1. Chess on an infinite plane. See the topics there
2. Hand and brain chess. You could consider using an engine for one part of the pair. In hand and brain chess, one player picks the type of piece and the other plays a move which must be with that piece. Castling is considered a king move, not a rook move. The brain would say "pawn" or "bishop" etc but wouldn't specify which one.
3. Forced capture chess which is different from giveaway chess, not only because kings retain special power but you are also trying to win by checkmate. Just that if you have a legal capture you have to make one, even if it means losing your queen to capture a pawn.

Of those 3 I reckon hand and brain would prove the most popular.

What is chess on an infinite plane?

https://www.chess.com/forum/view/chess-variants/chess-on-an-infinite-plane-vickalan-captaintugwash

I see that all the variants at Chess.com are variants of Western chess. Frankly, I consider that rather racist. Why not include Janggi (Korean chess) and Sittuyin (Burmese chess), especially considering that there are currently no online sites that host these 2 chess variants?

sittuyin is interesting to be added, but Janggi is not a chess variant, it's another game, it looks like xiangqi and go, you put the pieces in the intersections of the lines.

oh, chaturanga and chaturaji are both ancient forms of chess, played in india

Of these the "forced capture" one should be very simple to implement, as it uses standard chess rules but also incorporates one rule of giveaway chess, albeit in a slightly different form in that you don't capture if it leaves your king in check.

why don't you add checkers but all the pieces are ferz and they are promoted to bishop at the last rank lol

lol no checkers is forbidden here

I think Chaturanga should be added to the chess.com app.

Why is it that the elephants in Courier Chess sometimes look like elephants and sometimes look like mini-bishops?

I can't remember whether we actually have straightforward Capablanca Chess here under a different name. That's normally played on a 10x8 board with the Chancellor and Archibishop taking up the extra back-rank squares.