The difference between promise bluff and double bluff

[KuronoJoucho]

https://ibb.co/cJbg0PJ

This topic ends.

[Romain672]

I want to add that with bga interpretation, there could be some annoying desynchronisation:
B: y1-x-x-x
C: b2-x-x-x
D: x-b2-b3-x
On that situation A want to get y1, in some cases, there will not be many bluff target available. On that case, let's assume A clue blue to C or D.
Here D has the upside to get an extra b3 so A clue blue to D. y1 gets played, C has no idea something weird is going on, D assumes most likely b3, and A and B know that D has b2 and not b3.

You could argue that D should assume b2 or b3 since they got an extra card here (and they don't see a better bluff target on C).

Then when b2 of C arrives on chop, and if D's turn, D can't clue that 2, he is far from C's position so should not clue it most of the time anyway, but if C has a 5 before that b2, that mean A or B will need to save it in case D has b3, and that hold true whether D got b2+x or b3+x (unless you assumes that clue earlier with both b2 is illegal)(or a context read from D is enough strong for them to assume the right card).

While hgroup has no desynchronisation, since the cards are played immediately.

[Layered Bluff]

It's good to see you've realized your mistake about namings or conventions used here as opposed to on other sites. You'd have hard time trying to convince people a clue should work differently than they are used to.

One more thing worth mentioning is that promise bluff and double (or triple, quadruple, even quintuple) bluff are not mutually exclusive. The combination of both is possible.
The former cares about unmarked card(s) that someone should keep track of after the play(s) have initially stopped.
The latter cares only about how many cards of different colors than the marked card have been played before the bluff is revealed.

For example in a situation similar to Blacktango's last example, but with no card played yet: https://spoo.me/CDZlqD after the initial 3 clue double bluff makes red and blue 1 play, one of the players is expected to keep track of the missing white 2. This is with the assumption the table plays with the simplest (and at the same time the strictest) promise rules. Note that some people may not respect this rule and clue even if white 2 is missing. Best to ask before the game starts.

Just for fun, here is an example of 3-promise quintuple bluff: https://spoo.me/ldeIHD