Is this a promise on b3 and b4?

[Kaznaka]

blue is clued and y1 played. Is this just a regular bluff, or could it be promising b3 and b4?

[_mg6maciej_]

Just a simple bluff requiring a fix.

Once metta learns it's a pure blue card (not 2m) and 1b is played, 2 clue is needed to avoid a bomb of 5b.

If someone uses 5 instead of 2 to fix, the position of 3 and 4 should be assumed to be leftmost or marked and not where they would be at the time of the blue clue.