Variant suggestion: Premove Chess

Like normal chess, but every move is a premove.  I.e. you don't get to see your opponent's move until after you move.  If you make an illegal move, you lose.

Like this:

1. White moves.  Black does not see what White played.

2. Black moves.  Now Black can see what White played, but White cannot see what Black played.

3. White moves.  Black does not see it yet, but White can now see what Black played.

And so on.

The strategy will revolve around trying to trick the other person into making an illegal move.  Imagine the following position:

The threatened sacrifice on f2/f7 is very dangerous - but attempting it is also risky.  Aggressive players will often win or lose within 3-4 moves after either guessing wrong or forcing their opponent to guess.  Cautious players might well have a longer game.  Still, I expect endgames would be pretty rare and most games would finish within 10-15 moves.

Huge +1

+999l

+1 but won't everyone play scholars mate and win and lose?

there's a fifty fifty chance

That's the fun part

correct...

+1 it;s fun

I think it should be unrated variant 

+1

It's risky.  For example, imagine this game:

It's a very risky play for both sides.  White is being the aggressor, and is therefore the first to take the risk.

In general, aggressive play will be extremely risky, but if you guess right you force your opponent to guess.  But the first to make the aggressive move is the first to take the risk of an immediate loss.

At higher levels, I would expect much more cautious play.

+1

e4 e6 "Try scholar mating me!😀"

Thought of this before but did not post it as I do not know what to do when a illegal move is made,I don't think instant loss is good so -1

The general idea is nice, but the game is too unbalanced.
White has too much initiative, actually not by scholar mate because lines can be blocked, but with knights. The white-queen-knight can reach the black king in 4 moves. Consider the plan:
1. Nc3 2. Nc5/Nd5/Ne4 3. Nc7/Nd6/Nf6 4. Ne8#
Black has hard time to stop the second: playing 1... c6 and guessing where to capture the knight, which is 50% to lose or 50% to continue the game up a knight. Another option would be to play Nf6 which blocks two of three options without risking fatality on a wrong guess. Then, if black doesn't try that, they will have a hard time to guess correctly while the knight dances around black's camp and king.

White risks trying to move a captured knight, but the chances for that are already conditioned on black making a successful capture, which are low. Also, white can also play with the other knight for a move just to make sure.

The main problem is that knights can never make an illegal move (unless attempting a re-capture), and their path cannot be blocked, so a rule of "illegal premove = lose" is too harsh for a player defending against a knight.
Playing down a knight is nothing in that condition, so white can definitely afford that. Worst case, if white fails, they becomes the defending player (e.g. against a black knight).

Overall I'd estimate the win-rate for white as more like two-thirds rather than half, if not even higher.

Hmm... yeah, the knights are a major threat.

I suppose Black could try to defend against that by moving the king whenever a knight is within range.  Whether that would be sufficient to balance it would probably require playtesting.

Or you can take out the knights all together

Maybe replace them with extra bishops?  Although it would be nice to keep the original set of pieces if we can find a way to make it balanced.

fairy pieces alfil?

Save the fairy pieces for another variant.