You may want to check out Tony Wood's website on
http://www.lesbutler.ip3.co.uk/tony/tonywood.htm
and go to bottom of page: Eastern Front Vol.4, 1944 Jul-Dec for Luftwaffe claims on 26-7-1944.
It seems even more than 9 Pe-9s were claimed, but some may have been in other areas.
Regards,
Leendert