Pattern-Based Constraint Satisfaction and Logic Puzzles (Third Edition)"Pattern Based Constraint Satisfaction and Logic Puzzles (Third Edition)" develops a pure logic, pattern based perspective of solving the finite Constraint Satisfaction Problem (CSP), with emphasis on finding the "simplest" solution. Different ways of reasoning with the constraints are formalised by various families of "resolution rules", each of them carrying its own notion of simplicity. A large part of the book illustrates the power of the approach