Gevin was the creator of Gevincountdown. He created it before the original official Channel 4 forum was removed but when it was in its dying days. Gevin is also credited as inventing Countdown Advanced, now known as Hypercountdown.
Gevin Scoring is the method of scoring words strictly on how many letters they contain. In normal Countdown, 9-letter words are scored double for 18 points, but with this method they are simply scored 9. This is quite widely used on Apterous.