For posting:
- invitations to games (you can also use the New Game menu)
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you got it, Ramblin. The only possible downside to promotion is by promoting your last pawn, you'd lose the game. I've seen a few cases where selective promotion has won games for people, some to Qs, some to other pieces that were "endangered." Honestly, though, promotion doesn't happen nearly as often as regular chess.
But both of your questions are spot on. 2 kings is no different than 2 queens.