From the Racing Post website:
Khyber Kim: "Nothing has come to light," says trainer Nicky Henderson
by PA Sport staff
NICKY Henderson remained at a loss on Sunday over Khyber Kim's tame reverse in the Rossington Main Novices' Hurdle at Doncaster on Saturday.
Sent off the 2-5 favourite after a superb debut success over hurdles at Newbury, the six-year-old could finish only fourth to Tazbar.
Khyber Kim returned to Seven Barrows in good nick, but Henderson believes that performance was too bad to be true.
Significantly, the form from his Newbury win in December was franked, as Theatre Girl, no match for Khyber Kim that day, ran a fine race behind Henderson's Chomba Womba in a Grade 2 at Doncaster.
"Nothing has come to light at the moment and he's perfectly sound," said Henderson.
"Chomba Womba and he are very similar at home and what Chomba Womba and Theatre Girl did on Saturday showed that form was probably wrong.
"It's our job to find out what happened and to hopefully get him back to where he was."