If the only game you win is against a player who wins 4 games in the section, your S-B will be 4. But if you also beat someone who wins 2 games in the section, your S-B will now be 6. It is kind of like a more accurate determination of the winner - if 2 players get the same number of wins, but one beats the other, that person should be the winner. This takes that into account :-)