user15223: The copycat strategy is a rather silly one that guarantees a 50% score. Basically, you play White in one game and Black in the other game. You copy moves from one game to the other. So for example, if in the game with Black your opponent plays 1. e4, then you also play 1. e4 in your game with White. Then when the opponent replies (with say 1...Nf6) then you play 1...Nf6 in your game with Black. You effectively cease to be involved in the game, which becomes a game between your two opponents instead. You'll either win one game and lose the other, or draw both - for a 50% score.
This strategy is inapplicable in OTB games since you only ever play one game at a time, but it can conceivably work in correspondence chess. Is it legal?

user12629: According to the USCF correspondence rules:

You may consult chess books and periodicals but not other players.

I would interpret this to mean that playing two opponents against each other would not be legal. You are getting the moves from another player, which is prohibited.
There's also a slight practical weakness in this strategy, especially if your opponents are aware you are doing it: it's possible that the delays between when the opponent makes a move and when you play it against the other opponent would make you use an extra day's worth of time. Eventually you may be forced to move before your other opponent does, or overstep your time and lose.

15223: <p>The copycat strategy is a rather silly one that guarantees a 50% score. Basically, you play White in one game and Black in the other game. You copy moves from one game to the other. So for example, if in the game with Black your opponent plays 1. e4, then you also play 1. e4 in your game with White. Then when the opponent replies (with say 1...Nf6) then you play 1...Nf6 in your game with Black. You effectively cease to be involved in the game, which becomes a game between your two opponents instead. You'll either win one game and lose the other, or draw both - for a 50% score.</p>
<p>This strategy is inapplicable in OTB games since you only ever play one game at a time, but it can conceivably work in correspondence chess. Is it legal?</p>
 12629: <p>According to the USCF <a href="https://new.uschess.org/correspondence-chess/rules" rel="noreferrer">correspondence rules</a>:</p>
<blockquote>
<p>You may consult chess books and periodicals but not other players.</p>
</blockquote>
<p>I would interpret this to mean that playing two opponents against each other would not be legal. You are getting the moves from another player, which is prohibited.</p>
<p>There's also a slight practical weakness in this strategy, especially if your opponents are aware you are doing it: it's possible that the delays between when the opponent makes a move and when you play it against the other opponent would make you use an extra day's worth of time. Eventually you may be forced to move before your other opponent does, or overstep your time and lose.</p>
