Update announcement-backlog.md

misc/announcement-backlog.md

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 ## The Backlog (Variant-Specific Conventions)
 
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+@everyone Clarified variant-specific conventions:
+
+**The Pink Play Clue Lie (on 5's) (Illegal)**
+
+- This convention only applies to pink-fives & omni-fives
+- First, see the section on the [_Pink Play Clue Lie_](pink.mdx#the-pink-play-clue-lie-ppcl-with-a-mismatched-play-clue-that-touches-other-cards).
+- Even though it is not possible to clue number 5 in some special-fives variants, [_Pink Promise_](pink.mdx#pink-promise) still applies to the rank clues given. In other words, players are not expected to account for the possibility of a playable 5 when they receive a non-5 rank clue.
+- Subsequently, if a player lies about the identity of a 5 with a _Pink Play Clue Lie_, it risks losing the game, since the receiving player might perform a _Gentleman's Discard_ (or be otherwise confused about the identity of the card in such a way that causes a cascading failure).
+- For this reason, these kind of clues are only typically given as a last resort. (Color clues should be given instead in order to get a 5 to play.)
+- In addition to _Pink Promise_ applying to rank clues on playable cards, it also applies to rank clues used on trash cards. In other words, a number 1 clue that indicates either a _Trash Chop Move_ or a play clue on a 5 would indicate the former.
+
+**Rank Play Clues on 5s**
+
+- This convention only applies to light-pink-fives.
+- Pink Promise does not apply to rank clues that could represent a playable 5. Thus, when players receive a rank _Play Clue_, they have to account for the possibility of it being the true rank and the possibility of it being a playable 5.
+- For example, in a 3-player game:
+  - Red 2 and blue 4 are played on the stacks.
+  - Alice clues number 3 to Bob, touching a single card on slot 1.
+  - Bob knows that this must be a _Play Clue_. Bob marks the card as either the red 3 or the blue 5.
+
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