youngest

In 2010, at the age of 14, he became one of the youngest ever published chess authors when he wrote a book titled Mastering Positional Chess, covering practical skills and technical manoeuvrings.

The letter says victims were groomed online, and tended to be in their early 20s, with the youngest known victim being 13.

He believes Gaza's problems are so great that the youngest generation of the family will not be able to play much role, despite their high level of education.

"It may be days, it may be months, it may be years, or we may never see her again," says Santoyo, one of Maria's seven children, of whom the youngest is just six years old.

Her youngest child Ben said she was "quite simply irreplaceable".