The interference of one black piece by another like moving one on the same line (if the pieces are on different lines, it is a Holzhausen).
ECHESSPEDIA
Quotes of the Day
Kramnik was the luckiest man in the history of chess. He never won a single cycle, he got all the matches that he played for political reasons.
Veselin Topalov 2014
I’ve got no regrets about the games themselves, as frankly I’ve never been narcissistic about my play.
Alexander Grischuk 2014
Not this time, Mr. Carlsen! (after winning the World Blitz Championship 2016)
Sergey Karjakin 2016
One of the most important things in chess is pattern recognition: the ability to recognise typical themes and images on the board, characteristics of a position and their consequences.
Magnus Carlsen 2010
In chess,honestly,nobody cares how beautiful you play,if Morphy would be 2710 today,he would not get a single invitation.
Teymur Rajabov 2017