Case LinkedIn Queens #792: 9×9 grid, 9 colored regions. Nine exhibits — queen coordinates R1C9, R2C6, R3C3, R4C1, R5C8, R6C4, R7C7, R8C2, R9C5. No two queens may share row, column, region, or adjacency.
Board spotlight: Several color regions span only a few cells — scan those regions first because they often force a queen into a single row or column. Region sizes range from 4 to 21 cells — smaller regions often pin a queen to a single row intersection.
Exhibit 1: queen at R1C9. Row 1, column 9 is the forced queen once region 1, row, column, and touch rules are applied together.
Exhibit 2: queen at R2C6. Row 2, column 6 is the forced queen once region 3, row, column, and touch rules are applied together.
Exhibit 3: queen at R3C3. Row 3, column 3 is the forced queen once region 2, row, column, and touch rules are applied together.
Exhibit 4: queen at R4C1. Row 4, column 1 is the forced queen once region 4, row, column, and touch rules are applied together.
Exhibit 5: queen at R5C8. Region 6 only touches row 5 once on this board, so its queen must land at column 8.
Exhibit 6: queen at R6C4. Row 6, column 4 is the forced queen once region 5, row, column, and touch rules are applied together.
Exhibit 7: queen at R7C7. Row 7, column 7 is the forced queen once region 8, row, column, and touch rules are applied together.
Exhibit 8: queen at R8C2. Region 7 only touches row 8 once on this board, so its queen must land at column 2.
Exhibit 9: queen at R9C5. After eliminations, row 9 has one legal square left — column 5.
Verdict: placement set R1C9, R2C6, R3C3, R4C1, R5C8, R6C4, R7C7, R8C2, R9C5 is consistent with every rule. Case closed.