[sten]

bernard knows months and upon understanding that albert doesn’t know, figures it out.

how?

upon finding out albert doesn’t know, bernard can rule out may and june due to uniques (18 and 19).
since he didn’t know at first, but now does, ruling out may and june leaves july and august.
since he now knows, bernard must not have ‘14’ as it’s ambiguous.
that leaves 15, 16, and 17.
since 15 and 17 are both august, but bernard knows the date... they must be eliminated.
that leaves 16th of july

july 16

[panzerkamphwageneinz]

since 15 and 17 are both august, but bernard knows the date... they must be eliminated.
that leaves 16th of july

WHY? just because bernard knows the date, why does that mean it couldn’t be any of these three days?

HELP!!!

[Ramius]

Yep. I think I was wrong again... But when I go through again I came up with the same logic you did.

[BlackAdderess]

Excellent :)

[The_Reader_David]

Your reasoning is more or less right, except that the crucial information Albert provides in the first step is not that he does not know, but that he knows Bernard does not either — it is this that communicates to Bernard that the month is not one of those with a unique day number in the list, not the fact that Albert does not know.