Case LinkedIn Queens #787: 9×9 grid, 9 colored regions. Nine exhibits — queen coordinates R1C3, R2C6, R3C8, R4C2, R5C9, R6C5, R7C1, R8C4, R9C7. 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 49 cells — smaller regions often pin a queen to a single row intersection.
Exhibit 1: queen at R1C3. Row 1, column 3 is the forced queen once region 2, row, column, and touch rules are applied together.
Exhibit 2: queen at R2C6. Region 3 only touches row 2 once on this board, so its queen must land at column 6.
Exhibit 3: queen at R3C8. Row 3, column 8 is the forced queen once region 1, row, column, and touch rules are applied together.
Exhibit 4: queen at R4C2. Row 4, column 2 is the forced queen once region 4, row, column, and touch rules are applied together.
Exhibit 5: queen at R5C9. Region 5 only touches row 5 once on this board, so its queen must land at column 9.
Exhibit 6: queen at R6C5. Row 6, column 5 is the forced queen once region 6, row, column, and touch rules are applied together.
Exhibit 7: queen at R7C1. Region 7 only touches row 7 once on this board, so its queen must land at column 1.
Exhibit 8: queen at R8C4. Region 8 only touches row 8 once on this board, so its queen must land at column 4.
Exhibit 9: queen at R9C7. After eliminations, row 9 has one legal square left — column 7.
Verdict: placement set R1C3, R2C6, R3C8, R4C2, R5C9, R6C5, R7C1, R8C4, R9C7 is consistent with every rule. Case closed.