Checked 07.00 CET Thursday 27th today . Yes it can work


1) Use URL -> 'http://www.ihg.com/hotels/us/en/reservation/findandbook?ratePreference=IBAMB'
(same as eg IDEX1, just with IBAMB instead )

2)Select rate 'Ambassador Certificate' from Pull Down
(At this point I usually de-select all-ihg-brands tickbox brands and leave just IC ticked )

3)Plug in City, weekend 2-night date pairing

4)Search

5) click on [Check Rates]
(Despite returned search list on left-hand-side of page showing rate legend 'best available'

6)after [check rates] you see only amb cert rates , in the same display format we see as for a normal search

7)Having selected Hotel, eg London-PL you can within the listing click [change search] change dates and research a different weekend 2day span AND get results as amb Bogo cert again

** but to search different hotel, you must go back to (1) and start again. **

Enjoy

PS
I know works as I plugged in values for LONDON / March 14-16 and eg IC Park Lane is then showing Ambassador Weekend Cert rates