Otto, who has led from the start, struggled to find the fairway throughout but held on to his lead with a series of up and downs and par saving putts. Three early birdies were cancelled by an equal number of bogeys but Otto moved clear of his nearest rivals with a birdie on the 13th and then holed a long, curling putt on the 17th to 11 under. The Qualifying School graduate bogeyed the last but his one under par 71 was nevertheless a brave performance.
Otto will be seeking his first win since earning Membership of the European Tour, his best performance to date being joint sixth in the Scottish PGA Championship last season.
Rose, runner-up to Adam Scott last week in the Alfred Dunhill Championship equalled the best round of the day with a fine four under par 68 to move into contention for the second successive week. Austrian Marcus Brier also shot a 68.
McNulty shot a three under par 69 as he chases his 16th European Tour title and first since 1996.
Also in the group on six under are other Qualifying School graduates Simon Dyson, winner of three titles on the Asian Tour last year, and Justin Hobday and Ryder Cup player Thomas Bjorn.
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