Patches #171 Solving Notes
First read: Patches #171 starts with 12 clue cells on a 7×7 board. Begin with the fixed clues at r1 c1, r1 c7, r3 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 6-cell clue at r5 c5. 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 11, which should form the 3×2 rectangle from r5 c5 to r7 c6.