In an attempt to find the best setup for both FFA and Teams ten setups were analysed, most of them with the help of the top players. The optimal setup was found to be BYG switch, which you can see below:
Let me enumerate all the advantages and disadvantages of the setup:
+ Great Opening Structure variety, surpassing even old standard in terms of this aspect very slightly. All the structures are viable even without transpositions, but I'm convinced that certain transpositions could make certain structures stronger.
+ Great Flavour variety, the games can range from highly positional and slow-paced ones to the super-complicated and tactical openings, just like in old standard. Any side can avoid too tactical or too positional openings easily.
+ Great Opening variety, any player can play queen's pawn OR king's pawn via a transposition or, if it is legal, right away on the first move and come out with a decent position, albeit some openings require superb theoretical understanding. Compare to old standard, where every side has both king's and queen's pawn ideas, albeit with many transpositions.
+ A rather rare scenario that lower-rated players might compare to RY running out of moves while the higher-rated players would call it a long-term advantage, is when RY have to slow down so BG may obtain an advantage that will allow them to equalize. In BYG switch, this advantage still belongs to BG, though it is highly nerfed compared to old standard due to KQ placement and rather exceptional move order specifics (was tested thoroughly), unlike in omatamix setup. It is even possible for BG to overtake RY in rare cases, but RY can convert via the same advantage and vice versa. The arguments to explain this in the setup are omitted for brevity, but for the lower-rated players you may want to take a look at this game to grasp the idea: https://www.chess.com/variants-test/old-standard/game/7303216/0/1.
+ Equal activity for FFA except yellow, but yellow is much more solid than the other colors and doesn't have to rely so much on red. Overall, this setup features a superb FFA balance.
+ Great engine evaluation, top three according to the TeamTerminator.
= Mild aesthetics, not ugly and is rather fast to adjust to.
- Not representative of 2PC, but, hey, 4PC is an entirely different game!
Setup Comparison:
https://docs.google.com/spreadsheets/d/1fYezLmfXdr5JeuuRsRy0zbV05H4HDeD7EVGMQfJTCfk/edit?usp=sharing
Notable testing games:
https://www.chess.com/variants/custom/game/27018916/0/4
https://www.chess.com/variants/custom/game/27040298/78/3
https://www.chess.com/variants/custom/game/27060930/54/1
https://www.chess.com/variants/custom/game/27044637/36/1
https://www.chess.com/variants/custom/game/26701657/54/1
https://www.chess.com/variants/custom/game/26700912/42/2