To deal with KV1 as OST:
P4 flank (KV1 has piss poor penetration and movement)
Panther
Puma
Pak + snare
Pgrens with shrecks in yellow cover
as OKW:
P4 flank
Puma
Panther,
Raketen + snare
Are you kidding?
even in a vacuum a kv1 would win against a p4 that hits every shot in the rear of the kv1, good luck trying that with a single zis or snare around.
puma has more range but will bounce most of its shots, the kv1 can just ignore a puma and get a zis in position.
shrek pgrens are horrible against a high armor/health target. specially in YELLOW COVER?????? are you serious? thats the worst advice ive every heard. when you want to risk your 340mp 100muni squad to get rekt in a single shot, sure go for it lol
tbf, panther and a supported pak can deal with a kv1 but on its own will never be able to kill it.
the strongest thing about the kv1 is its timing. it can be on the field 2-3 minutes after the ost p4 and at this point the axis player wont be prepared for it