LinkedIn Queens #800 is a 8×8 Queens board with 8 color regions (cells per region: 3–19). Solution placements: R1C3, R2C1, R3C8, R4C4, R5C6, R6C2, R7C5, R8C7. 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 19 cells — smaller regions often pin a queen to a single row intersection.
Row 1 → column 3 (region 2). Row 1, column 3 is the forced queen once region 2, row, column, and touch rules are applied together. Elimination: Placing here claims row 1, column 3, and region 2. Auto X marks will block 63 other cells from holding another queen in those units.
Row 2 → column 1 (region 1). Row 2, column 1 is the forced queen once region 1, row, column, and touch rules are applied together. Elimination: Placing here claims row 2, column 1, and region 1. Auto X marks will block 63 other cells from holding another queen in those units.
Row 3 → column 8 (region 3). Region 3 only touches row 3 once on this board, so its queen must land at column 8. Elimination: Placing here claims row 3, column 8, and region 3. Auto X marks will block 63 other cells from holding another queen in those units.
Row 4 → column 4 (region 4). Region 4 only touches row 4 once on this board, so its queen must land at column 4. Elimination: Placing here claims row 4, column 4, and region 4. Auto X marks will block 63 other cells from holding another queen in those units.
Row 5 → column 6 (region 7). Row 5, column 6 is the forced queen once region 7, row, column, and touch rules are applied together. Elimination: Placing here claims row 5, column 6, and region 7. Auto X marks will block 63 other cells from holding another queen in those units.
Row 6 → column 2 (region 6). After eliminations, row 6 has one legal square left — column 2. Elimination: Placing here claims row 6, column 2, and region 6. Auto X marks will block 63 other cells from holding another queen in those units.
Row 7 → column 5 (region 8). Row 7, column 5 is the forced queen once region 8, row, column, and touch rules are applied together. Elimination: Placing here claims row 7, column 5, and region 8. Auto X marks will block 63 other cells from holding another queen in those units.
Row 8 → column 7 (region 5). After eliminations, row 8 has one legal square left — column 7. Elimination: Placing here claims row 8, column 7, and region 5. Auto X marks will block 63 other cells from holding another queen in those units.
Final verification: R1C3, R2C1, R3C8, R4C4, R5C6, R6C2, R7C5, R8C7 satisfies all 8 rows, columns, and regions with zero adjacency conflicts. Pattern tag: tight-region board.