Various rating systems are used to determine the strength of a player, or chess computer.
These include:
elo: FIDE.
uscf: United States Chess Federation.
ecf: English Chess Federation.
bcf: British Chess Federation (no longer exists).
cfc: Canadian Chess Federation.
To determine how strong a Chess Program is, a standard will need to be used in order to compare against other players.
Determine Strength
Estimate Chess Engine Playing Strength
Conversions