Alt text: The draw-by-repetition rule does a good job of keeping players from sliding a tile back and forth repeatedly, but the tiles definitely introduce some weird en passant and castling edge cases.
Or first move then slide? Though I’m realizing what this means for check. So maybe either move or slide? Or if slide results in checking the opponent, you forfeit the move?
But if it’s either move or slide, then repeating slides to force a stalemate it a problem