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.
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Quotes of the Day
He has weaknesses, as everyone does, but far fewer than those around him.
Veselin Topalov 2016
Petrosian would never have beaten me if he had played like that in 1963.
Mikhail Botvinnik 1966
This one hour allows me to put the problem into the background and then, when I come back, I am much more rational and less emotional about the particular problem and I can think better about it.
G. Borg 2016
Drawing general conclusions about your main weaknesses can provide a great stimulus to further growth.
Alexander Kotov
Chess is a scientific game and its literature ought to be placed on the basis of the strictest truthfulness, which is the foundation of all scientific research.
W. Steinitz