White makes the interference to avoid a stalemate by allowing a fight to the opposite King, which is met by a discovered mate by the same white piece.
ECHESSPEDIA
Quotes of the Day
In one game it is too difficult to play both for win and draw simultaneously.
Mihail Tal 1969
If the 12th game (from the match Carlsen-Karjakin)… were a restaurant dish, I would send it back to the chef.
Nigel Short 2016
To Put It Mildly, I Have Not a Bit of Respect For Topalov
Vladimir Kramnik 2015
Ten years ago I said that 2010 would be the end, chess would be exhausted. But it is not true, chess will not die so quickly.
Vishy Anand 2008
Unfortunately this gentlemanlike behaviour among chessplayers is out of fashion. It’s my principle that you should respect your opponent as much as you respect yourself.
Lajos Portisch 1990