Ipswich closed in on the League One top two with a seventh-straight victory as they beat Derby 2-0 at Pride Park.
Peterborough claimed a crucial win in the race for the Sky Bet League One play-offs by beating fellow promotion hopefuls Derby 2-0.
Play-off hopefuls Derby lost a home League One game for the first time since early October when they were beaten 2-0 by Fleetwood.