Hi, I'll be helping to judge competative soon and I was discussing infraction scenarios with a Lv1 who couldn't exactly explain the different penalities for these two:

Example A: A player does not attack with a creature that must attack each turn.

Example B: A player casts Brainstorm during his first turn and forgets to put two cards back on top of his library.

Both are examples of GRVs from the IPG and I mentioned that they would probably work for Failure to maintain game state as well. (Sufficant time passes in the examples until the opponent notices) Allthough my Lv1 friend told me that this is only the case with example A and that it isn't with example B even if he couldn't explain it.
So what's the difference exactly? (if there is one)
Thanks!

Cool that you are going to judge your first Competitive REL event soon, enjoy it!

FtMGS penalties are applied when your opponent commits a Game Play Error that you could have noticed, but still let it happen (unintentionally).

Both examples you give here are a GPE - Game Rule Violation by the opponent, so the other player will get a Warning for FtMGS in both cases. In Example B, the Brainstorm player resolved the Brainstorm partially and thus incorrectly, which the othe rplayer should and could notice, so he gets the according penalty.

I'm very curious why your mentor thought that example B is different than example A!

Greetz, Dustin.

Thank you for the answer, I thought as much. This was actually not my mentor but just me and a Lv1 friend discussing. My mentor has been too busy so he haven't had time to answer being in the middle of a move and all.

Originally posted by Dustin De Leeuw:

FtMGS penalties are applied when your opponent commits a Game Play Error that you could have noticed, but still let it happen (unintentionally).

And just to complete Dustin's answer, we also never apply FtMGS for Game Play Error - Missed Triggers.

Just confirming reasoning on that, Emilien. It is the case that not completing a spell's effects (Brainstorm) or not pointing out that a creature should be attacking every turn are game states that are non-negotiable, but it is never the opponent's responsibility to point out missed triggers, correct?

Sorry, this is probably a pretty rudimentary situation, but I'm also a new judge and I want to learn as much as I can.

Correct. Both players are responsible of making sure game rules are followed, with the exception of pointing out your opponent's triggered abilities.