Brock Purdy offers a critical assessment of his five-TD performance vs. Colts

SANTA CLARA — In the NFL’s passer-rating system, 158.3 is considered a perfect score.And 49ers coach Kyle Shanahan gave quarterback Brock Purdy a near-perfect grade following his five-touchdown performance in San Francisco’s 48-27 victory over the Indianapolis Colts on Monday night.“He did awesome, man, played really well,” Shanahan said on Monday. “(I) got on him for a couple he missed, but it was pretty close to a perfect game.”But as the 49ers returned to work Wednesday to begin preparations to face the Chicago Bears on Sunday at Levi’s Stadium, Purdy found plenty of instances to submit a critical self-assessment of his play against the Colts.“Obviously, there were some missed throws and opportunities, and I want to score a touchdown on every drive, so I’m looking at myself like, ‘All right, how did we not convert there?’ ” Purdy said. “And it’s my decision here or there, and the interception at the end of the game, tipped ball, it was high.”Purdy completed 25 of 34 pass attempts for 295 yards and five touchdowns with one interception, and finished with a passer rating of...