4.1. The Hex Swamps Conundrum
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When implementing the Hex planks in the swamp game, I encountered a situation
where the first game I tried to solve was unsolvable by the solver.
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To solve it, I programmed a proto-game, that let me play the puzzle, and
check each state I reached, whether it was also reached by the solver.
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I then discovered the problem (a moved plank was blocked by its origin state).
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Here's a screenshot of the game:
Written by Shlomi Fish