This puzzle appears to have been invented by Erich Friedmann.
Puzzle and Goal
An unsolved puzzle consists of a rectangular grid containing numbers.
The goal is to color the cells white or black to satisfy the clues.
The solved grid must satisfy the following conditions:
White cells indicate the number of total neighbors (including itself) that are white.
Black cells contain some number other than the total number of white neighbors.
At least one cell is white.