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Feature request: Kriegspiel

now i understand what this variant is, how is it possible to mate your opponent you have no idea where any of his pieces are?
does it just become a flag fest?
#11
it is not the case that one would have "no idea" of the locations of his opponent's pieces. firstly the same familiar starting position is used. any player, black or white, only has 20 options for that first move.
as the game moves on, uncertainty does increase. this is the point of the game. but the possibilities are still constrained and so its possible to infer probable locations.
In particular, in kreigspiel it is possible with two rooks (or two bishops) to trap a king.

Still, I find the idea of Dark Chess (fog of war chess) more interesting since you can sometimes see your opponent's pieces!
I prefer Dark Chess as well. It balances between chess' tactical aspects and the new gameplay element of having incomplete information.
I think that every chess variant that can be easily found (including dark chess) has a sizable community playing it; not large, but definitely not minuscule either. Lichess certainly won't be lacking players willing to try out new variants: e.g. Crazyhouse was only added yesterday, and there are already nearly 20,000 games played.

Obviously, in neither dark chess or Kriegspiel would spectators be able to see anything, but that should not be a big consideration.

Personally I prefer dark chess, as it is certainly faster to make each move than in Kriegspiel.
Kriegspiel is a great game. I would love to play it on Lichess.

Just one difference compare to other games: no observers should be allowed to avoid cheating.
Also, to sum up the rules roughly:

Dark Chess: Squares on the board to which a player cannot move a piece in one move only are "unknown", and he/she does not know whether it is empty or it contains an enemy piece. The aim of the game is to capture the enemy king, and rules regarding check are relaxed (meaning castling through check is legal etc.).

Kriegspiel: You only see your own pieces. Checks and their direction, as well as possible pawn captures are announced by an umpire. Moves that are illegal (attempting to move a rook past an enemy piece etc.) are retracted by the umpire and replaced with another move of the player's choice. The goal is to checkmate.
I also would love to play kriegspiel on lichess.

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