LinkedIn Queens #820 is a 8×8 Queens board with 8 color regions (cells per region: 3–33). Solution placements: R1C4, R2C6, R3C2, R4C7, R5C3, R6C8, R7C5, R8C1. Each queen owns one row, one column, one region, and cannot touch another queen even diagonally.
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 3 to 33 cells — smaller regions often pin a queen to a single row intersection.
Row 1 → column 4 (region 1). Row 1, column 4 is the forced queen once region 1, row, column, and touch rules are applied together. Elimination: Placing here claims row 1, column 4, and region 1. Auto X marks will block 63 other cells from holding another queen in those units.
Row 2 → column 6 (region 3). After eliminations, row 2 has one legal square left — column 6. Elimination: Placing here claims row 2, column 6, and region 3. Auto X marks will block 63 other cells from holding another queen in those units.
Row 3 → column 2 (region 2). Row 3, column 2 is the forced queen once region 2, row, column, and touch rules are applied together. Elimination: Placing here claims row 3, column 2, and region 2. Auto X marks will block 63 other cells from holding another queen in those units.
Row 4 → column 7 (region 5). Row 4, column 7 is the forced queen once region 5, row, column, and touch rules are applied together. Elimination: Placing here claims row 4, column 7, and region 5. Auto X marks will block 63 other cells from holding another queen in those units.
Row 5 → column 3 (region 4). Region 4 only touches row 5 once on this board, so its queen must land at column 3. Elimination: Placing here claims row 5, column 3, and region 4. Auto X marks will block 63 other cells from holding another queen in those units.
Row 6 → column 8 (region 6). Region 6 only touches row 6 once on this board, so its queen must land at column 8. Elimination: Placing here claims row 6, column 8, and region 6. Auto X marks will block 63 other cells from holding another queen in those units.
Row 7 → column 5 (region 7). After eliminations, row 7 has one legal square left — column 5. Elimination: Placing here claims row 7, column 5, and region 7. Auto X marks will block 63 other cells from holding another queen in those units.
Row 8 → column 1 (region 8). After eliminations, row 8 has one legal square left — column 1. Elimination: Placing here claims row 8, column 1, and region 8. Auto X marks will block 63 other cells from holding another queen in those units.
Final verification: R1C4, R2C6, R3C2, R4C7, R5C3, R6C8, R7C5, R8C1 satisfies all 8 rows, columns, and regions with zero adjacency conflicts. Pattern tag: tight-region board.