Patches #138 Solving Notes
First read: Patches #138 starts with 13 clue cells on a 7×7 board. Begin with the fixed clues at r1 c1, r1 c7, 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 strongest number anchor is the 2-cell clue at r2 c3. Large regions usually have fewer safe placements, so this clue is a better first test than a tiny patch. After reveal, check it against Region 6, which should form the 2-cell horizontal strip from r2 c2 to r2 c3.