Wishing to keep the tournament interesting until the closing date and to better explore the theme, we have decided to extend the competition on the two (for now!) sub-categories. The best composition in each sub-category will be awarded with the Special Prize. The rules and criterions are the same as in the main tournament except:

Sub-category A
The thematic polygon must be made by a promoted Knight.

Sub-category B
The thematic polygon must be made by both a white and a black Knight. Main criterion for ranking will be sum of both areas.

The third sub-category is a combination of the sub-categories A and B:

Sub-category C
The thematic polygon must be made by both a white promoted Knight and a black promoted Knight. Main criterion for ranking will be sum of both areas.