Crucially, however, both turn a fleshy pink as the century progresses - a change designed to illustrate the growing heat.

In general, there has been a steady decline as the century progresses, with 2015 and 2018 being the exceptions.

As the century progresses, chess organisation develops quickly with many chess clubs, chess books and chess journals appearing.

As the century progresses the profile of the vases becomes elongated and the decoration more mannered.