Michael's Shadow Chess: On each turn, you make 2 "moves". One move is your REAL move. One move is your fake "Shadow" move.

Your opponent will see both moves, but will not know which one if your REAL move, and which one is your shadow move (until after they submit their next move[s]) So your opponent will not know which move is real, and will see both - and will be able to make their REAL and "Shadow" move for their turn. (After they submit and confirm their moves, they will only then see which one of your moves were the real one.)

Other rules:

Pawns can still capture like normal (diagonal / En passant) - even if the "captured" piece ends up being the fake shadow piece, the pawn will still be allowed to stay in the new column.

Checks: Unlike normal chess, you ARE allowed to stay in check, you ARE allowed to put yourself in check & ignore being in check. (your own risk) SO FOR EXAMPLE: Your opponent puts you in check. You can then use your fake move to move your king out of check, and then use your real move to put them into check. So now your opponent will have to decide if they want to try to capture your king, or protect their own king with their real/fake moves.