Case LinkedIn Queens #802: 9×9 grid, 9 colored regions. Nine exhibits — queen coordinates R1C8, R2C2, R3C7, R4C9, R5C4, R6C1, R7C6, R8C3, 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 2 to 46 cells — smaller regions often pin a queen to a single row intersection.
Exhibit 1: queen at R1C8. Row 1, column 8 is the forced queen once region 4, row, column, and touch rules are applied together.
Exhibit 2: queen at R2C2. Row 2, column 2 is the forced queen once region 2, row, column, and touch rules are applied together.
Exhibit 3: queen at R3C7. Region 3 only touches row 3 once on this board, so its queen must land at column 7.
Exhibit 4: queen at R4C9. Region 5 only touches row 4 once on this board, so its queen must land at column 9.
Exhibit 5: queen at R5C4. Region 6 only touches row 5 once on this board, so its queen must land at column 4.
Exhibit 6: queen at R6C1. Row 6, column 1 is the forced queen once region 1, row, column, and touch rules are applied together.
Exhibit 7: queen at R7C6. Row 7, column 6 is the forced queen once region 8, row, column, and touch rules are applied together.
Exhibit 8: queen at R8C3. Region 7 only touches row 8 once on this board, so its queen must land at column 3.
Exhibit 9: queen at R9C5. After eliminations, row 9 has one legal square left — column 5.
Verdict: placement set R1C8, R2C2, R3C7, R4C9, R5C4, R6C1, R7C6, R8C3, R9C5 is consistent with every rule. Case closed.