To All :
I've been submitting IHG BRG's successfully for several years now.
I don't know if others have noticed the latest "phenomenon" but here goes...the last 4 times I submitted a 100% confidence level/totally verifiable IHG BRG submission form using booking.com as the cheaper room source, my claim was rejected and coincidentally the booking.com rate changed immediately and no longer became available...AMAZING...The IHG BRG program is nothing short of a hoax at this point and marketing gimmick. I can attest to this 100%.