Tony Thomas wrote:If I remember correctly, I paid 19 dollars for Naum 2.2. Ofcourse, I got the previous customer discount.
According to ccrl
Rybka 2.3.2a is rated 3068
Elo/dollar = 3068/41 = 74.83
Naum is rated 2891
Elo/dollar = 2891/19 = 152.16
This ELO/dollar comparison is just wrong.
Since 2 values of ELO between 2 engines, can not be compared linearly by dividing each other, but only by using the subtraction of these 2 ELO values.
What i mean with more simple words is that:
Rybka=3068 and Naum=2891 ELO values are equivalent to:
Rybka=1268 and Naum=1091 ELO values and also equivalent to:
Rybka=268 and Naum=91 ELO values.
So by getting the last one you get:
Rybka 2.3.2a is rated 268
Elo/dollar = 268/41 = 6.5
Naum is rated 91
Elo/dollar = 91/19 = 4.8
So Rybka is better.
Contradiction.
You have to find another valid comparison to take into account both strength and price.