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
I have often written that Karpov is like an iceberg. Well, Kasparov was the Titanic.
Alexander Roshal
In the 70s Karpov was a darling of the Politburo or the political elite. So Kramnik is now. Just like the old days. But at least Karpov, unlike him, played in and won qualifying matches.
Veselin Topalov
I will be World Champion, if not now I will be World Champion later, but of course better now!
Sergey Karjakin 2016
The Golden Age, when machines were weak and my hair was strong!
Garry Kasparov 2017
I thank the Lord for not pairing me with Black against Magnus Carlsen in the first round.
Nigel Short 2017