Have you seen it guys? In All England final Ivanov/Sozonov managed to get 3 unsuccessful challenges and every time umpire announced "1 challenge remaining"... Even after the last one . Bug in the software?
Since January 1st 2016, there is a new experimental IRS law: So if you challenge once per game and lose all the challenges, you have indeed 1 challenge remaining every single time.
Cool, didn't know. Seems like a very good idea. Players will not have to skip valid challenges in the beginning of the match in fear they will run out. Player still cannot use more than 2 in a game to cause a delay. It's really a win - win. Is there an easy way to get updates to the rules? Like mailing list or something? Usually, the federation sends us updates, but not this one...
I wish there was ... apart from the little (Updated) marker on http://bwfcorporate.com/regulations/ every now and then, I am unaware of any public source.