In chess composition, a pair of interference variations created by Walter Grimshaw (1832-1890) around 1850, in which piece X interferes with piece Y and vice versa.
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Quotes of the Day
Petrosian would never have beaten me if he had played like that in 1963.
Mikhail Botvinnik 1966
Garry has done a lot over the chess board – unbelievable things. He is the greatest world champion in the chess history. The question is what he has done for the federations, what he has done for his own federation.
Georgios Makropoulos 2013
Karpov Lost, Kasparov Lost, the Only One Who Remained Is Me.
Silvio Danailov 2014
We lost the crowns of World Champions, it is sad, of course. But if you look at the rating list of top 100 players, Russia is still dominating. However, the competition is constantly growing stronger.
Arkady Dvorkovich 2011
I will be World Champion, if not now I will be World Champion later, but of course better now!
Sergey Karjakin 2016