Chicago Chess Club, Chicago, IL USA; March/April 1871
"Contested in Chicago lately as one of a drawn contest of five Games of a match between Judd of Detroit and Bock of Chicago."(1)
"Mr. Max Judd of Detroit, during a short visit to Chicago, contested five games with Mr. F. Bock of that city, each winning two games—one was drawn."(2)
"The two game given below were contested recently in the Chicago Chess Club between Mr. M. Judd, of Detroit, and Mr. F. Bock, of Chicago."(3)
Crosstable, game dates, and game numbers.
Chess Journal, v2 n16, June 1871, pp155-157
New York Spirit of the Times, 1871.04.22
New York Turf, Field and Farm, 1871.04.21