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There's the strength of schedule as we know it, which is really comprised of the win-loss records of the teams that remain on a given contender's calendar.
Then there's the "real" strength of schedule that takes into account other important factors, such as how each team on the remaining schedule plays to the relative strengths and weaknesses of the contender in question.
The D'Backs are clearly superior to the Giants when it comes to hitting, and indeed, are sixth in the NL in runs scored.
But four out of the remaining six teams that they play (Nationals, Padres, Giants, and Dodgers) are in the top six in the league in pitching, all with a team ERA of 3.69 or less.
By contrast, the Giants, a team built on the back of its elite pitching staff, face just two teams that rank above seventh in the NL in hitting (Rockies and Diamondbacks).