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SF 16 · 7MBNNUECalculating moves...
Interference occurs when the line between an attacked piece and its defender is interrupted by sacrificially interposing a piece - typically on a protected square.

In this position, Black threatens mate on e2, but White's queen is protecting that square. Can you make a bishop move to interfere with this defense?

From Adolf Jay Fink - Alexander Alekhine, 1932.
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Interference

Also known as obstruction