Rather than continue a thread-jack, I will ask here about yellow vs yellow attacks.
The graphic shows how red, green and blue are circular in relation to each other. The legend says the strong color hits with double strength. Only following up in the forum do you find out weak hits with half strength.
Yellow vs purple, though, is different. They are strong vs each other, but never weak.
How from this would a player figure out yellow vs yellow and purple vs purple attack at only half strength?