Add TwoLinesRequireColor heuristic. - #16
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Issue #15 identified a puzzle that wasn't solveable with our existing heuristics. With some help from Codex / Sol, this adds a new heuristic: for any two adjacent lines, if all valid solutions use a given color, then we can safely x-out all instances of that color outside those two lines. With this change, the puzzle in #15 can be solved, and that puzzle is added as a test case to validate the fix. Resolves #15
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Issue #15 identified a puzzle that wasn't solvable with our existing heuristics.
With some help from Codex / Sol, this adds a new heuristic: for any two adjacent lines, if all valid solutions use a given color, then we can safely x-out all instances of that color outside those two lines.
With this change, the puzzle in #15 can be solved, and that puzzle is added as a test case to validate the fix.
Resolves #15