<P> The auction houses had a weekend to come up with a choice of move . Christie's went to the 11 - year - old twin daughters of the international director of Christie's Impressionist and Modern Art Department Nicholas Maclean, who suggested "scissors" because "Everybody expects you to choose' rock' ." Sotheby's said that they treated it as a game of chance and had no particular strategy for the game, but went with "paper". </P> <P> Christie's won the match and sold the $20 million collection, with millions of dollars of commission for the auction house . </P> <P> In many real - time strategy, first - person shooter, and role - playing video games, it is common for a group of possible weapons or unit types to interact in a rock--paper--scissors style, where each selection is strong against a particular choice, but weak against another, emulating the cycles in real world warfare (such as cavalry being strong against archers, archers being strong against pikemen, and pikemen being strong against cavalry). Such game mechanics can make a game somewhat self - balancing, and prevent gameplay from being overwhelmed by a single dominant strategy . </P> <P> Many card - based video games in Japan use the rock--paper--scissors system as their core fighting system, with the winner of each round being able to carry out their designated attack . Sega Master System's Alex Kidd in Miracle World has a level where the player has to win a rock - paper - scissors game to go ahead . Others use simple variants of rock--paper--scissors as subgames like Mario Party Advance and Paper Mario: Color Splash . </P>

One way in which these battles are similar is that in each battle