Did you solve it? Are you a genius at gerrymandering?

The hands of David Niven, a professor of political science at the University of Cincinnati, holding a map demonstrating a gerrymandered district in Cincinnati in 2019 Photograph: John Minchillo/AP

Earlier today I set three gerrymandering logic puzzles. Here they are again with solutions.

In each of the grids below, the challenge is to find the unique electoral map in which the minority colour wins the most regions. A region is defined as a contiguous block of cells that are joined either horizontally or vertically. (A region cannot contain any cells that are only connected diagonally, i.e. via a corner.) Winning a region means having the most cells in that region.