Unfortunately, even after playing several 4-player games, the "Dangerous Intersection" and "Battle Royale" achievements on Chess.com appear to be glitched and no longer auto-unlockable. Contacting Chess.com support is the only suggested workaround; they might manually award the achievements.
Guys how to have dangerous Intersection and battle Royale achievements
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I played 10 four player games but did not get the these achievements.