Stale Chess (idea for variant)

No checking,moving into check,or exposing your king to check are allowed.  Win via stalemate. Thoughts?

what happens if your opponent checkmates you?

He would have played an illegal move, because you cannot checkmate without checking. So the game would be put back to the position where he made this move, and he must than make another one (possibly after receiving a time penalty). That is how illegal moves are handled in Chess, they cannot be part of a game there. In Shogi a player making an illegal move just loses instantly.

Games would always last into the end-game, because stalemating with much material on the board is in practice not possible. Forcing the opponent to sacrifice material to avert a mate is not possible, as you cannot have mate threats. My first impression is that this would make the game less interesting and more drawish.

in order to stale mate your opponent it's easier with less material on the board however the less material on the board the more likely on side is able to put the opponent in check. i don't think this variant is possible to play because at one point one side could get the other in a position where no matter what he does his opponent will be able to check him next turn making every move illegal.

i wouldn't mind playing out this variation with you to prove that you have to make an illegal move. (letting you opponent check you)

I think you misunderstand the rules. (Either that, or I do.) I read "exposing your King to check" as exposing it to capture in the subsequent opponent move (by moving a pinned piece). You seem to read it as exposing the King to capture in two moves of the opponent (with a turn pass in between). I don't see how that would be compatible to checking not being allowed anyway. If the opponent is not allowed to make moves that attack my King, he cannot capture it in any number of moves, no matter how many moves he gets in a row. The only way my King then could get exposed to capture is when I do that myself.

You win by running your opponent out of moves

Sure. But to know what that means, it should be defined what moves are legal. Your first posting suggests that not every move that is legalunder FIDE rules would be legal in your game.

A variant ultra similar to your was already invented.

Its called sacred chess.

http://www.chessvariants.com/other.dir/modest-various.html#sacredking

You can't put your king into check, can't check enemy king.

You win by stalemate or killing all your enemy pieces (excluding king).

The difference between sacred king chess and your variant is that if you capture all enemy pieces (excluding king) you don't win.

If I remember I saw even a variant of sacred king chess, that if a piece move more than one square (queen, bishop, rook, pawn double step), you can't put your king (dont remember if enemy too) at check during the sub parts of your move.