[Ray76]

I’m a little doubtful about how Bernard makes his claim, but Alert’s claim confirms the answer.

Albert and Bernard each have been given correct data.

Albert was given the month but, as there are multiple possibilities within each month, he can not determine the date.

Bernard was given the day. Possible days are: 14, 15, 16, 17, 18, and 19. Except for 18 and 19 there are multiple occurrances of each day.

Albert announces that he knows that Bernard can not know the date. This tells Bernard that the day is not unique. Therefore May 19 and June 18 can be ruled out.

Bernard said “at first I didn’t know, but now I do”.

At first his information, the day, was not unique.

At first Albert’s information, the month, was not unique.

But now after Albert’s announcement and consequent ruling out of May 19 and June 18 Bernard claims to know the answer. Then Albert, who knows only the month, says he too knows. The only month left with a single day is June. Albert’s claim can only be supported if June 17 is the answer.

That’s my story and I’m sticking to it. ;)

[RoosterRedux]

See my post 67 and see if it makes any sense.

[RoosterRedux]

The only way Albert knows Bernie cannot know is that Al knows the months are not May and June.

So that leaves all the dates in July and August.

At that point, Bernies says...I now know. Therefore Al concludes that it must be a single day and that leaves only July 16, Aug 15, and Aug 17 as possibilities.

When Al announces that he now knows the answer, that means the answer must be the last remaining single month (because he only knows the month) otherwise, he would not know the answer.

June 17th.