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
It’s always better to sacrifice your opponent’s men
Savielly Tartakower
Chess should not become an obsession. Otherwise there’s a danger that you will slide off into a parallel world, that you lose your sense of reality, get lost in the infinite cosmos of the game. You become crazy.
Magnus Carlsen 2010
Chess is a fairy tale of 1001 blunders.
Savielly Tartakower
Maybe I had something of Capablanca. Why should I prepare when I have ideas?
Svetozar Gligoric 1989 NIC
I believe motivation is one of the most important things one has to have after playing for many years. Chess is a very complete, well thought-out game, which is why people have been playing it since ancient times.
Judith Polgar