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Bills vs. Chiefs has become this generation's defining rivalry and right now you can use the latest DraftKings promo code to get in on the action, as new users receive $300 in bonus bets and three months of free NBA League Pass. Josh Allen and Patrick Mahomes have gone head-to-head nine times in the regular season and playoffs, and they'll meet for a 10th time on Sunday in Buffalo at 4:25 p.m. ET. Claim your DraftKings promo code here: For the full terms and conditions and how to claim the promo, read our DraftKings promo code review. How to claim the DraftKings promo code There's no code required for this online sports betting offer, but you have to be of legal age in a state where DraftKings legitimately operates. You must also be a new user at the sportsbook to get the offer, meaning you could not have previously signed up for a DraftKings account. Here's how to sign up for one of the top betting sites. Click "Claim Bonus" on this page or click here. Create a DraftKings Sportsbook account by entering all required information, including name, email and the last four digits of your Social Security number. Agree to DraftKings' terms and conditions. Make an initial deposit of at least $5 Place a first bet of at least $5 with odds of -500 or shorter. Get started here: DraftKings will give you bonus bets in the form of $25 slips within 72 hours of your qualifying wager settling as a win. Bonus bets are valid for seven days after they are received. They hold no cash value. Payouts from bonus bets are transferred to the user's cash balance and do not include the bonus bet stake. Bills vs. Chiefs betting preview Despite the only having a 5-4 edge in the all-time head-to-head, it's been advantage Mahomes early in the careers of these two MVP quarterbacks. Allen is yet to play in his first Super Bowl while Mahomes has guided the Chiefs there in five of the last six years while winning three championships. However, Allen has had a distinct advantage in regular-season meetings, going 4-1 against Mahomes outside of the postseason. Buffalo is coming off a 40-9 beatdown of the Panthers after a bye week to end a two-game losing streak. Meanwhile, Kansas City has won five of six following a 28-7 win over the Commanders on Monday Night Football last week. The latest Week 9 NFL odds from DraftKings list the Chiefs as 2.5-point road favorites while the over/under is 52.5 points. The over has hit in six of the nine head-to-head matchups between the Bills and Chiefs since Allen and Mahomes took over as starters. This will be the third time in less than a year that these two franchises have squared off, with Kansas City winning the AFC Championship Game 32-29 at Arrowhead Stadium and Buffalo winning the Week 11 regular-season matchup 30-21 at Highmark Stadium. Get $300 in bonus bets instantly if your first bet of $5 or more wins and three months NBA League Pass for free. Responsible Gaming at DraftKings DraftKings provides a "Responsible Gaming Center" tab for users on their profile pages. This landing page includes help for problem gambling as well as "Safer Play Tools," a list of options that allow users to limit their use of the app with deposit limits (daily, weekly or monthly), wagering limits, max wager limits and time limits. The platform also has a support team available 24/7 via live chat, and provides contact information for state and national helplines for those who need additional help. If you think you may have a gambling problem, you can call or text 1-800-GAMBLER.