Queen's Logic galloped to favouritism for next year's Sagitta 1,000 Guineas with a spectacular display at Newmarket yesterday.

She ran her rivals into the rain-softened ground to give Mick Channon a second win in three years in the Shadwell Stud Cheveley Park Stakes - and crown jockey Steven Drowne's comeback from injury with a first career Group One victory.

And the unbeaten two-year-old was immediately given the official seal of approval as she was hailed champion filly "no question" by British Horseracing Board juvenile handicapper Matthew Tester.

Queen's Logic, winner of the Queen Mary Stakes and Lowther Stakes on her previous two starts, started 10 to 11 favourite for this six-furlong test - run on officially soft ground, with five of her intended rivals withdrawn.

Her backers never had a moment's worry as she eased to the front a quarter of a mile from home and then burst well clear once asked to quicken inside the final furlong.

Sophisticat, who had chased her home in the Queen Mary and Lowther, was second again but beaten fully seven lengths this time, rather than the half-length margin at Royal Ascot or the length and a quarter at York.

The rest were well beaten off and Ladbrokes were impressed enough to make Queen's Logic 5 to 2 favourite for the Guineas, ahead of last Saturday's Ascot winner Gossamer (5-1).

"She is a proper racehorse," Channon said, hailing the winner of a race he took with Seazun in 1999.

"She has got such class and she has improved all year. My only worry was the ground - she wants good ground. She will get a mile standing on her head next year, the way she settles.

"Gossamer is obviously a very good filly but what has she beaten?" And Tester was quick to offer official endorsement of the trainer's view.

"There is no question that Queen's Logic is my champion filly," he said. "She has achieved something extraordinary."

Aidan O'Brien was not dismayed by the defeat of Sophisticat, saying: "The winner is a very good filly. Sophisticat is a lovely filly but we have some lovely fillies to come out."

Galileo's brother Black Sam Bellamy was beaten on his racecourse debut, but O'Brien was anything but despondent.

Black Sam Bellamy was sent off 6 to 4 favourite for the Lifestyle Financial Services Maiden. But after cruising in the early stages the colt named after an 18th century pirate who plundered his trade in Caribbean waters was momentarily all at sea when racing into the Dip.

Galvanised by Michael Kinane, Black Sam Bellamy rallied on the climb to the post but went under by two heads to Hathaal, trained by Michael Stoute, and Henry Cecil's newcomer Sting Like A Bee.

"He ran a lovely race and Michael was delighted with him," said O'Brien.

O'Brien had suffered an earlier reversal when Royal Ascot winner Landseer was an unlucky loser of the £400,000 Tattersalls Houghton Stakes.

Kinane twice found himself facing traffic trouble on the Ballydoyle-trained favourite which made the difference between victory and a head defeat by Mark Johnston's Sir George Turner, the mount of Kevin Darley.