Same thing they've done all year: get out to an early lead. Philly has been so good out of the blocks and in first halves, that opponents have to abandon their playbook and go pass-heavy to catch up. The Eagles' run game then chokes them out in the 2H, grinding out first downs on the ground and eating up the clock/possession. When KC does have the ball, you've got to protect against any deeper passes and limit Mahomes to short/intermediate throws and get good pressure with the front four, which Philly has done all year. Easier said than done however.