This week's problems and quotes come from Chess Problems: Tasks and Records by Jeremy Morse.
"By the early years of this century (20th), as many as 7 interferences had been shown, and indeed, in the following problem, they were all by one black knight."
Otto Wurzburg Pittsburgh Leader Tourney 1909/10 #2
"In 1916, Brian Harley pushed the record to 8, with the following threat problem, but the key is poor, and there are major and minor duals."
Brian Harley Pittsburgh Gazette Times 1916 #2
"Thereafter, composers turned to block form." We will continue our look at the progression of the record for interferences, over the next couple of weeks. In the meantime, 4 points for sending me a complete variation to these two problems, at firstname.lastname@example.org , by next Wednesday.