Context: The Cincinnati Bengals (7-5) scored the go-ahead touchdown with 4:51 remaining in the game and defeated the Chargers (4-8), 20-13. San Diego surrendered 10 points in the final five minutes of regulation for the second consecutive week, and they lost for the fourth straight week and seventh time in eight games. The Chargers dropped to 0-5 in games decided by seven points or fewer. It was their fourth loss in a game when holding a fourth-quarter lead. Williams intercepted Bengals quarterback Andy Dalton and returned it for a 31-yard touchdown, his second score of the season. Rivers had two turnovers in the final 3:54. A fumble set up a field goal for the Bengals, and he threw an interception on fourth-and-10 from Cincinnati's 17 with 49 seconds remaining. The Chargers' offense was held without a touchdown for the third time in the season. The Chargers' home crowd of 54,980 was their lowest since 2004. It was their second straight blackout and third of the season. Meachem did not have a pass thrown to him for the second straight week; it was his fifth game without a catch.

Question: How many points did the Bengals win by?

Answer:
7