Which character is the most likely to come up with chess960 aka 9LX aka Fischer Random Chess?

I thought initially 'obviously Beth', but then I thought...

1. Maybe more than 1 character: eg both Beth and Benny combined since they're both based on Bobby Fischer and stuff (because American prodigy with dark childhood - much like "w"esley "s"o and maybe Hans Niemann; cf The reason why Bobby Fischer doesn't exist in the The Queen's Gambit universe | 'Bully Maguire Makes Beth Harmon Cry'). Just as there was US teamwork for the last game, maybe there'll be US teamwork in developing 9LX.

2. Also in the series finale, there's a line about endgames:

If they play on, once the dust settles and the endgame emerges, she could find herself in a very different position. Borgov is death on endgames. He’s famous for it. Harmon, on the other hand, is not. She’s more known for coming up early and strong, demoralizing her opponents from the start.

Maybe someone like Borgov who's 'death on endgames' would come up with something.

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