Patches #150 Solving Notes
First read: Patches #150 starts with 10 clue cells on a 7×7 board. Begin with the fixed clues at r1 c1, r1 c6, r2 c3 instead of guessing color groups from empty space. Those clue cells are the safest anchors because every solved region must keep exactly one clue area and still cover the whole board.
Main anchor: The best anchor is the horizontal rectangle clue at r3 c5, not a random corner. This clue is useful because a strict shape has less room to wiggle than an open patch. After reveal, check it against Region 4, which should form the 2×4 rectangle from r2 c4 to r3 c7.