Seems like a technicality that's correct by letter only. I can live with it. Thnx for the clarification!
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If you buy Mission on the same turn you play Outpost, you can choose whether the Mission turn or the Outpost turn happens first; whichever one does will start with a 3 card hand, while the other will start with a 5 card hand.
Your observation is right.
Glicko-2, the rating system used, is still based on a ratings period (of one day for Dominion) and all the games during that rating period are processed "at the same time" (meaning it doesn't matter for your next rating in which order you played your rated games in the ratings period).
Before the ratings update, what was shown in the game client was your calculated rating during the last update, so basically your rating from last European midnight.
After the ratings update, what is shown in the client is the answer to the question: "If you don't play any more rated games during this ratings period, what will your rating be at the next update?"
That explains your observation. You play some games on day X and the client will show you what your rating will be at the ratings update between day X and day X+1. For me some days ago that was 49.51, so I got a "50" in the list.
Then, during that ratings update between day X and day X+1, my rating to be used for day X+1 was calculated as 49.51. But when I looked at my rating the next morning, it was 49.49. That's because I hadn't played a games that day yet, and the client told me what my rating would be if I didn't play any rated games this day. Naturally, it would decrease a bit.
I understand that players want to know "What is my rating right now?" Unfortunaetly, that concept doesn't exist for Glicko-2. You only have ratings at the end of ratings periods. Before the ratings update, that was what was shown, your rating at the last update. Now, what is shown is your rating at the next update, as predicted under the assumption that you don't play more games until that time.
I did, and it worked as it should, (game 42802580), but:
With Way of the Turtle and Prince there is a way to shoot yourself in the foot that I didn't think about before:
Each time you play the Princed card, the game asks you if you want to Turtle the card. And since you Turtled the Prince, the first time you play the Princed card is immediaetly after you set it aside (maybe there are other "At start of turn" effects, like other Turtled cards, then you can can choose the order).
So possibly you where asked how you want to play the Turtled Prince, this turn you decided to actually play it, you selected the Market Square to set aside, then where immediately asked how you want to play the Market Square (normal or using Turtle), which may have been a suprise and you clicked "Turtle" for whatever reason.
If you Turtle a Princed card, Prince will loose track of it, and Prince will not play it again. Maybe that is what happened, at least it seems plausible.
I tried it in a game (Turtled Prince, then next turn Princed a Druid), and Druid did its effect the next two turns (then I stopped checking).
I can only imagine that what happened was what Josh described (you set aside a duration card) or you set aside a card that trashes itself (say Embargo), or otherwise moves itself elsewhere (Hores/Experiment).
@josh: When you do set aside a Duration card with Prince, "only" the Prince is "wasted". The Duration card will be discarded as normal for a Duration card (when it's future effects are all done), and so get back into your deck. The Prince will have lost track of it at that time, so its effect is "wasted".
What card did you set aside with Prince? If you set aside a Duration card, then I think it disappears after one turn and would look sort of like the effect you're talking about. I've done that a few times and it's maddening...you spent a ton to buy Prince, waited till it matched up with the card you wanted, only to find out that it was worse than useless . . . because now that 4-or-lower card is gone from your deck for the rest of the game, and the Prince is useless as well.