Tournament rule 702.17

Failure to Maintain Game State [Warning]: A player does not call out another player’s failure to maintain the proper game state, including missed scoring from hold and conquer.

• 702.17.a Generally this error occurs when a player’s opponent commits a game play error and the player doesn’t call a judge…
• 702.17.b Unlike other Game Play Errors, this error is primarily for tracking and never upgrades unless specifically instructed…

Official Tournament Rules