In an example by Rechenberg, 1971, 1973, a random walk is pushed thru a corridor maximizing the parameter "x"1. In this case the region of acceptability is defined as a ("n" − 1)-dimensional interval in the parameters "x"2, "x"3, ..., "x""n", but a "x"1-value below the last accepted will never be accepted. Since "P" can never exceed 0.5 in this case, the maximum speed towards higher "x"1-values is reached for "P" = 0.5/"e" = 0.18, in agreement with the findings of Rechenberg.