Tracking issue for variant support

[tom-anders]

Creating this as a meta issue so it's easier to keep track of the remaining effort for full variant support:

• Fix Fairy-Stockfish integration: adapt to uci fix in multi-stockfish #2644

• Three-Check: Add indicator for number of checks to MaterialDifferenceDisplay widget: Variant material diff #2655

• Crazyhouse/Horde: Hide MaterialDifferenceDisplay: Variant material diff #2655

• Crazyhouse: Add piece menu to drag pieces onto the board Crazyhouse support 🎉  #2662

• Crazyhouse: Visualize DropMoves suggested by the engine

• Atomic: Add sound effect for explosions feat: add explosion sound for captures in Atomic Chess #2663

• Enable server analysis request for variants and support it in „learn from your mistakes“: Engine support for chess variants #2652, fix: support drop moves in learn from your mistakes #2658

• Enable tablebase requests for variants. It only supports standard for now:

  mobile/lib/src/model/explorer/tablebase_repository.dart

  Line 30 in fa5e72e

  Uri.https(kLichessTablebaseHost, '/standard', {'fen': fen}),

• fix issues mentioned in Still can play unsupported variants #1276 (comment)

  • Horde: if only two white pawns remain, there's a bug that prevents them from being captured
  • Racing Kings: do not flip board if playing black fix: do not flip board in Racing Kings if POV is black #2661

• Cloud evals for Analysis Board ( currently it uses the evals of standard chess) fix: include variant in evalGet event #2687

• Opening Explorer for Variants

• KoTH/RacingKings square highlights

• Add variant support to...

  • TV (see https://github.com/lichess-org/mobile/blob/b68e4b18d66fb7a9894db407fa75a3f91dd77607/lib/src/model/tv/tv_channel.dart): More variant support #2705
  • stand-alone Analysis Board (add menu to change the variant) feat: variant support in standalone analysis board #2660
  • Board Editor feat: add variant support to board editor #2673
  • OTB screen (add support for variant win/draw conditions)
  • Tournaments: More variant support #2705
  • "Create Game" dialog: More variant support #2705
  • Challenges: More variant support #2705
  • Study
  • offline computer play: More variant support #2705

[ijm8710]

Would any of these also make sense?:

• "play against computer"
• ability to request analysis for variants such as atomic
• studies
• Broadcasts

I don't think these exist on web but if they did:

• Practice themes per variant
• Puzzle themes per variant

[sohang3112]

Also AntiChess variant should be added to this list.

[tom-anders]

Would you see "play against computer" as an additional category slightly separate from challenges? Worth being on the eventuals list?

Perhaps also ability to request analysis for variants such as atomic?

Is requesting server analysis for variants possible on the website?

[tom-anders]

Also AntiChess variant should be added to this list.

Does the website do anything special for antichess (e.g. material display, sound effects)? Otherwise, we don't need to add it to the list explicitly, since our chess library (dartchess) already supports the rules of all the variants available on the website. This issue is meant to only track the support needed on top of that (e.g. sound effects for atomic, piece menu for crazyhouse, etc.)

[ijm8710]

Would you see "play against computer" as an additional category slightly separate from challenges? Worth being on the eventuals list?

Perhaps also ability to request analysis for variants such as atomic?

Is requesting server analysis for variants possible on the website?

Loooks to me like it does. If I go to chesstv, go to profile of a top player and then open a game, I seem to be able to request it. Atomic is where I tested it with since I know it doesn't work in the app

Also, you caught me slightly early as I was editing in potential other places where variants may possibly may make sense to track. In my original comment. Not sure if any of others listed are relevant but think I incorporated all the places that may also make sense in that original comment if there are still more to merge in on your post?

[tom-anders]

Would you see "play against computer" as an additional category slightly separate from challenges? Worth being on the eventuals list?
Perhaps also ability to request analysis for variants such as atomic?

Is requesting server analysis for variants possible on the website?

Loooks to me like it does. If I go to chesstv, go to profile of a top player and then open a game, I seem to be able to request it. Atomic is where I tested it with since I know it doesn't work in the app

Ah interesting, will add it to the list

Also, you caught me slightly early as I was editing in potential other places where variants may possibly may make sense to track. In my original comment. Not sure if any of others listed are relevant but think I incorporated all the places that may also make sense in that original comment if there are still more to merge in on your post?

• Added study and computer play to the list
• For broadcast IIRC the server does not support it currently. We detect chess960 broadcast by checking the starting position, but that’s it.
• for puzzles it would also need to be implemented on the server first

[HaonRekcef]

Amazing works so far! So more things that are needed:

• Cloud evals for Analysis Board ( currently it uses the evals of standard chess)
• Opening Explorer for Variants
• KoTH square highlights

[tom-anders]

Amazing works so far! So more things that are needed:

• Cloud evals for Analysis Board ( currently it uses the evals of standard chess)[ ] Opening Explorer for Variants[ ] KoTH square highlights

Added to the initial post to keep things organized 👍

[ziv-vy]

Displaying the 960 position number somewhere would also be nice.