Patches #189 Full Analysis
First read: Patches #189 starts with 6 clue cells on a 6×6 board. Begin with the fixed clues at r1 c2, r2 c3, r3 c4 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 9-cell clue at r3 c4. 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 3, which should form the 3×3 square block from r2 c4 to r4 c6.