The possibility of beginning is 15 Mei, May 16, May 19, June 17, June 18, July 14, July 16, August 14, August 15 and August 17.
When Cheryl's birthday is June 18 or May 19, then Bernard notified
immediately know the exact figures for the numbers 18 and 19 are not
contained in the other months.
The rest likely May 15, May 16, June 17, July 14, July 16, August 14, August 15 and August 17.
When Albert was told that Cheryl is the birthday month of May or June,
then Albert will not be able to say, "I know that Bernard does not
know, too." It proves that Albert told that Cheryl's birthday in July or
Now, the remaining possibility is 14 Juli, July 16, August 14, August 15 and August 17.
Bernard told the date. From the words of Albert, Bernard knew that Albert was told in July or August. When Bernard told the 14th, then he will still be confused because on July 14 and August 14. In fact he said, "But, I know". Bernard means not told that the date is 14.
At this stage, Bernard already knew that birthday on July 16. Why, Cheryl has told Bernard that Anggal birth is 16.