This has been bothering me over the years, and I'd like to understand better why it went down this way. I thought it might be better to abstract it out, leaving out details, but the instructions are to include as much detail as possible, so here it is... Worlds 2011, Junior Division, middle of the Swiss Rounds. My Junior son, the US National Champion that year, is playing a rogue deck against a European National Champion, which utilizes Yanmega Prime's Poke-body of matching hand size to perform an attack without meeting the energy requirement. So after many practices and winning Nationals with it, you can imagine my son is very practiced at playing his hand to strategically match the opponent's hand size. Nearing the end of the Swiss game, where my son is a couple of turns away from winning, my son asks the opponent his hand size. The opponent says 6. My son plays a Professor Juniper, drawing a fresh seven, benching a Basic Pokémon, and then declares Sonic Boom (which he doesn't have required energy attached for, but has the same hand size so Poke-body is in effect). The opponent says no you can't do that, I have 7 cards. After the game, we had a very hard time understanding the Judges of what happened, while trying to console our sobbing son, so I'm sorry I can't recall what was said...but the net result is he couldn't complete his attack strategy and ultimately lost the game. The only thing I can fathom is that ultimately the burden should be on the Player (my son) to be very sure about the opponent's hand size...even visually inspecting and counting. But even then, if the opponent is going to cheat like this, they can be deceptive about that too (hiding a card on their lap, for example). What I don't understand is that if the game state is so easily rewindable one step (benching the Pokémon) to match the opponent's real hand size, why that wasn't the proper Judge intervention, especially given it was Juniors? Did Worlds-level have something to do with it?