When you’re the “official pizza” of the San Francisco 49ers, you’ve got to throw a promotion to the fans.

So starting with Sunday’s season opener, Mountain Mike’s Pizza will offer 49 percent off any large, one-topping pizza after any game in which the 49ers score.

The promotion applies to games all season long, home and away, at the 200 restaurants in 49er fan territory operated by Mountain Mike’s, which was founded in the Bay Area more than 40 years ago.

The promotion is valid on the two days following the game day — meaning Monday-Tuesday after a Sunday game or Tuesday-Wednesday after a Monday night game, through Dec. 31. (Offer excludes the Thursday, Oct. 31, game.)

You can do dine-in, take-out or delivery with this deal, although delivery minimums may apply. If you order online or by phone, use coupon code 49ERSWIN.

Find details and restaurant locations at www.mountainmikespizza.com.