
Seventeen days later, on May 11th 1978, Robert Graysmith had a cartoon featured in the San Francisco Chronicle "Letters to the Editor" page. It depicted Leonid Ilyich Brezhnev (leader of the Soviet Union) swinging from a tiger's tail, with the phrase "I am in control of all things" (with only the word "now" dropped from the April 24th 1978 letter).

So did Robert Graysmith copy most of the phrase from the April 24th 1978 "Zodiac" letter to use in his cartoon on May 11th 1978, subconsciously leaking the "I am in control of all things" phrase and the "Soviet Union" theme of the cartoon into a forged letter on July 19th 1978, the day after two "Soviet Union" grandmasters opened the World Chess Championship? Writing "But maybe you play chess with me". Did Robert Graysmith forge both letters on April 24th 1978 and July 19th 1978? Or did the Zodiac Killer author both letters - and Robert Graysmith plagiarized the Bay Area murderer? In later years Robert Graysmith spoke of the Zodiac Killer's "game of chess" with the police and newspapers.