Puzzler: solution

This puzzler was posted by Doug Hull recently. This code is my attempt at a solver. The file main.m includes the functions written by Doug so that the solver may be run without any supporting files.

My solver takes a greedy approach, forming a heuristic based on looking 2 moves ahead. Near the end of the game the algorithm looks to eliminate colours from the board.
The search is non-exhaustive so that it always terminates quickly.