E. Colour Allocation Rules

	For each pairing apply (with descending priority):
E.1	Grant both colour preferences.
E.2	Grant the stronger colour preference.
E.3	Alternate the colours to the most recent round in which they played with different colours.
E.4	Grant the colour preference of the higher ranked player.
E.5	In the first round all even numbered players in S1 will receive a colour different from all odd numbered players in S1.