Queens Gamers

LinkedIn Queens #901 Answer & Hints – October 18, 2026

Independent walkthrough by Queens Gamers · · 9×9 · Play on LinkedIn

LinkedIn Queens hints and the full solution for puzzle #901 on October 18, 2026. Follow 25 verified deductions on this 9×9 board, starting with region 6.

Unsolved Queens #901 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells.

Region 1 (9 cells) · Region 2 (9 cells) · Region 3 (6 cells) · Region 4 (7 cells) · Region 5 (28 cells) · Region 6 (5 cells) · Region 7 (10 cells) · Region 8 (4 cells) · Region 9 (3 cells)

LinkedIn Queens #901 hints

Open one hint at a time. Reveal the full answer only when you are ready.

Hint 1

Start with region 6. Its candidates are R5C2, R6C2, R7C2, R8C2, R8C3. Which outside cells conflict with every candidate? Remember that each row, column and region needs exactly one Queen.

Starting board: no deductions applied yet.

Hint 1: starting candidates · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
5 cellsR5C2, R6C2, R7C2, R8C2, R8C3
Hint 2

Observe: region 6 must contain one Queen, chosen from R5C2, R6C2, R7C2, R8C2, R8C3.

Rule: Queens cannot share a row, column or region, or touch diagonally. R9C2 conflicts with R5C2, R6C2, R7C2, R8C2 through the same column (column 2); with R8C3 through diagonally adjacent cells.

Therefore: mark R9C2 ×. Every possible Queen in region 6 rules out these cells.

Board after step 1; earlier deductions are already applied.

Hint 2: after step 1 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
5 cellsR5C2, R6C2, R7C2, R8C2, R8C3
 Changed this step (square marker):
1 cellsR9C2
Hint 3

Step 1: Observe: region 6 must contain one Queen, chosen from R5C2, R6C2, R7C2, R8C2, R8C3.

Rule: Queens cannot share a row, column or region, or touch diagonally. R9C2 conflicts with R5C2, R6C2, R7C2, R8C2 through the same column (column 2); with R8C3 through diagonally adjacent cells.

Therefore: mark R9C2 ×. Every possible Queen in region 6 rules out these cells.

Step 2: Observe: region 8 has 3 remaining candidates: R7C1, R8C1, R9C1. All lie in column 1.

Rule: region 8 needs one Queen, so it will occupy column 1. column 1 can contain no second Queen outside region 8.

Therefore: mark R1C1, R2C1, R3C1, R4C1, R5C1, R6C1 ×.

Step 3: Observe: region 1 has 3 remaining candidates: R1C2, R1C3, R1C4. All lie in row 1.

Rule: region 1 needs one Queen, so it will occupy row 1. row 1 can contain no second Queen outside region 1.

Therefore: mark R1C5, R1C6, R1C7, R1C8, R1C9 ×.

Step 4: Observe: region 2 has 4 remaining candidates: R2C9, R3C9, R4C9, R5C9. All lie in column 9.

Rule: region 2 needs one Queen, so it will occupy column 9. column 9 can contain no second Queen outside region 2.

Therefore: mark R6C9, R7C9, R8C9, R9C9 ×.

Step 5: Observe: region 7 has 6 remaining candidates: R9C3, R9C4, R9C5, R9C6, R9C7, R9C8. All lie in row 9.

Rule: region 7 needs one Queen, so it will occupy row 9. row 9 can contain no second Queen outside region 7.

Therefore: mark R9C1 ×.

Step 6: Observe: row 1 must contain one Queen, chosen from R1C2, R1C3, R1C4.

Rule: Queens cannot share a row, column or region, or touch diagonally. R2C3 conflicts with R1C2, R1C4 through diagonally adjacent cells; with R1C3 through the same column (column 3).

Therefore: mark R2C3 ×. Every possible Queen in row 1 rules out these cells.

Step 7: Observe: column 1 must contain one Queen, chosen from R7C1, R8C1.

Rule: Queens cannot share a row, column or region, or touch diagonally. R7C2 conflicts with R7C1 through the same row (row 7); with R8C1 through diagonally adjacent cells. R8C2 conflicts with R7C1 through diagonally adjacent cells; with R8C1 through the same row (row 8).

Therefore: mark R7C2, R8C2 ×. Every possible Queen in column 1 rules out these cells.

Step 8: Observe: region 6 must contain one Queen, chosen from R5C2, R6C2, R8C3.

Rule: Queens cannot share a row, column or region, or touch diagonally. R5C3 conflicts with R5C2 through the same row (row 5); with R6C2 through diagonally adjacent cells; with R8C3 through the same column (column 3). R6C3 conflicts with R5C2 through diagonally adjacent cells; with R6C2 through the same row (row 6); with R8C3 through the same column (column 3).

View 8 coordinate references

Rule: Queens cannot share a row, column or region, or touch diagonally. R5C3 conflicts with R5C2 through the same row (row 5); with R6C2 through diagonally adjacent cells; with R8C3 through the same column (column 3). R6C3 conflicts with R5C2 through diagonally adjacent cells; with R6C2 through the same row (row 6); with R8C3 through the same column (column 3).

Therefore: mark R5C3, R6C3 ×. Every possible Queen in region 6 rules out these cells.

Step 9: Observe: region 9 must contain one Queen, chosen from R7C8, R8C7, R8C8.

Rule: Queens cannot share a row, column or region, or touch diagonally. R7C7 conflicts with R7C8 through the same row (row 7); with R8C7 through the same column (column 7); with R8C8 through diagonally adjacent cells. R9C8 conflicts with R7C8, R8C8 through the same column (column 8); with R8C7 through diagonally adjacent cells.

View 8 coordinate references

Rule: Queens cannot share a row, column or region, or touch diagonally. R7C7 conflicts with R7C8 through the same row (row 7); with R8C7 through the same column (column 7); with R8C8 through diagonally adjacent cells. R9C8 conflicts with R7C8, R8C8 through the same column (column 8); with R8C7 through diagonally adjacent cells.

Therefore: mark R7C7, R9C8 ×. Every possible Queen in region 9 rules out these cells.

Step 10: Observe: region 1 and region 8 and region 9 have remaining candidates 8 cells (see details), all within row 1 and row 7 and row 8.

View 8 coordinate references

Step 10: Observe: region 1 and region 8 and region 9 have remaining candidates R1C2, R1C3, R1C4, R7C1, R7C8, R8C1, R8C7, R8C8, all within row 1 and row 7 and row 8.

Rule: these 3 groups need distinct Queens, filling all 3 target groups.

Therefore: mark 8 cells (see details) ×. These cells lie outside the groups that reserve those Queens.

View 8 coordinate references

Therefore: mark R7C3, R7C4, R7C5, R7C6, R8C3, R8C4, R8C5, R8C6 ×. These cells lie outside the groups that reserve those Queens.

Step 11: Observe: region 6 has 2 remaining candidates: R5C2, R6C2. All lie in column 2.

Rule: region 6 needs one Queen, so it will occupy column 2. column 2 can contain no second Queen outside region 6.

Therefore: mark R1C2, R2C2, R3C2, R4C2 ×.

Step 12: Observe: region 3 has 2 remaining candidates: R2C4, R2C5. All lie in row 2.

Rule: region 3 needs one Queen, so it will occupy row 2. row 2 can contain no second Queen outside region 3.

Therefore: mark R2C6, R2C7, R2C8, R2C9 ×.

Step 13: Observe: region 4 has 4 remaining candidates: R3C8, R4C8, R5C8, R6C8. All lie in column 8.

Rule: region 4 needs one Queen, so it will occupy column 8. column 8 can contain no second Queen outside region 4.

Therefore: mark R7C8, R8C8 ×.

Step 14: Observe: row 7 has only one remaining candidate: R7C1.

Rule: every row needs exactly one Queen.

Therefore: place a Queen at R7C1. The 2 cells marked × conflict with it by row, column, region or diagonal adjacency.

Board after step 14; earlier deductions are already applied.

Hint 3: after step 14 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
1 cellsR7C1
 Changed this step (square marker):
3 cellsR6C2, R7C1, R8C1
Reveal answer

Queens #901 full solution

Full solution for LinkedIn Queens #901 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Queens show the complete solution.
Queen coordinates (rows and columns start at 1)
RowColumnRegion
R1C31
R2C53
R3C92
R4C65
R5C26
R6C84
R7C18
R8C79
R9C47
How to solve LinkedIn Queens #901

Step-by-step walkthrough

The key insight

The opening deduction: Observe: region 6 must contain one Queen, chosen from R5C2, R6C2, R7C2, R8C2, R8C3.

Rule: Queens cannot share a row, column or region, or touch diagonally. R9C2 conflicts with R5C2, R6C2, R7C2, R8C2 through the same column (column 2); with R8C3 through diagonally adjacent cells.

Therefore: mark R9C2 ×. Every possible Queen in region 6 rules out these cells.

Your solving route

  1. Steps 1–14: narrow the candidates until R7C1 is forced.
  2. Steps 15–25: use the confirmed Queens to eliminate conflicts, then repeat the deductions for the remaining regions.

Open each deduction to see the observation, rule and board changes.

Step 1 · Common exclusions

Observe: region 6 must contain one Queen, chosen from R5C2, R6C2, R7C2, R8C2, R8C3.

Rule: Queens cannot share a row, column or region, or touch diagonally. R9C2 conflicts with R5C2, R6C2, R7C2, R8C2 through the same column (column 2); with R8C3 through diagonally adjacent cells.

Therefore: mark R9C2 ×. Every possible Queen in region 6 rules out these cells.

Board after step 1 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
5 cellsR5C2, R6C2, R7C2, R8C2, R8C3
 Changed this step (square marker):
1 cellsR9C2
Step 2 · Locked candidates

Observe: region 8 has 3 remaining candidates: R7C1, R8C1, R9C1. All lie in column 1.

Rule: region 8 needs one Queen, so it will occupy column 1. column 1 can contain no second Queen outside region 8.

Therefore: mark R1C1, R2C1, R3C1, R4C1, R5C1, R6C1 ×.

Board after step 2 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
3 cellsR7C1, R8C1, R9C1
 Changed this step (square marker):
6 cellsR1C1, R2C1, R3C1, R4C1, R5C1, R6C1
Step 3 · Locked candidates

Observe: region 1 has 3 remaining candidates: R1C2, R1C3, R1C4. All lie in row 1.

Rule: region 1 needs one Queen, so it will occupy row 1. row 1 can contain no second Queen outside region 1.

Therefore: mark R1C5, R1C6, R1C7, R1C8, R1C9 ×.

Board after step 3 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
3 cellsR1C2, R1C3, R1C4
 Changed this step (square marker):
5 cellsR1C5, R1C6, R1C7, R1C8, R1C9
Step 4 · Locked candidates

Observe: region 2 has 4 remaining candidates: R2C9, R3C9, R4C9, R5C9. All lie in column 9.

Rule: region 2 needs one Queen, so it will occupy column 9. column 9 can contain no second Queen outside region 2.

Therefore: mark R6C9, R7C9, R8C9, R9C9 ×.

Board after step 4 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
4 cellsR2C9, R3C9, R4C9, R5C9
 Changed this step (square marker):
4 cellsR6C9, R7C9, R8C9, R9C9
Step 5 · Locked candidates

Observe: region 7 has 6 remaining candidates: R9C3, R9C4, R9C5, R9C6, R9C7, R9C8. All lie in row 9.

Rule: region 7 needs one Queen, so it will occupy row 9. row 9 can contain no second Queen outside region 7.

Therefore: mark R9C1 ×.

Board after step 5 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
6 cellsR9C3, R9C4, R9C5, R9C6, R9C7, R9C8
 Changed this step (square marker):
1 cellsR9C1
Step 6 · Common exclusions

Observe: row 1 must contain one Queen, chosen from R1C2, R1C3, R1C4.

Rule: Queens cannot share a row, column or region, or touch diagonally. R2C3 conflicts with R1C2, R1C4 through diagonally adjacent cells; with R1C3 through the same column (column 3).

Therefore: mark R2C3 ×. Every possible Queen in row 1 rules out these cells.

Board after step 6 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
3 cellsR1C2, R1C3, R1C4
 Changed this step (square marker):
1 cellsR2C3
Step 7 · Common exclusions

Observe: column 1 must contain one Queen, chosen from R7C1, R8C1.

Rule: Queens cannot share a row, column or region, or touch diagonally. R7C2 conflicts with R7C1 through the same row (row 7); with R8C1 through diagonally adjacent cells. R8C2 conflicts with R7C1 through diagonally adjacent cells; with R8C1 through the same row (row 8).

Therefore: mark R7C2, R8C2 ×. Every possible Queen in column 1 rules out these cells.

Board after step 7 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
2 cellsR7C1, R8C1
 Changed this step (square marker):
2 cellsR7C2, R8C2
Step 8 · Common exclusions

Observe: region 6 must contain one Queen, chosen from R5C2, R6C2, R8C3.

Rule: Queens cannot share a row, column or region, or touch diagonally. R5C3 conflicts with R5C2 through the same row (row 5); with R6C2 through diagonally adjacent cells; with R8C3 through the same column (column 3). R6C3 conflicts with R5C2 through diagonally adjacent cells; with R6C2 through the same row (row 6); with R8C3 through the same column (column 3).

View 8 coordinate references

Rule: Queens cannot share a row, column or region, or touch diagonally. R5C3 conflicts with R5C2 through the same row (row 5); with R6C2 through diagonally adjacent cells; with R8C3 through the same column (column 3). R6C3 conflicts with R5C2 through diagonally adjacent cells; with R6C2 through the same row (row 6); with R8C3 through the same column (column 3).

Therefore: mark R5C3, R6C3 ×. Every possible Queen in region 6 rules out these cells.

Board after step 8 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
3 cellsR5C2, R6C2, R8C3
 Changed this step (square marker):
2 cellsR5C3, R6C3
Step 9 · Common exclusions

Observe: region 9 must contain one Queen, chosen from R7C8, R8C7, R8C8.

Rule: Queens cannot share a row, column or region, or touch diagonally. R7C7 conflicts with R7C8 through the same row (row 7); with R8C7 through the same column (column 7); with R8C8 through diagonally adjacent cells. R9C8 conflicts with R7C8, R8C8 through the same column (column 8); with R8C7 through diagonally adjacent cells.

View 8 coordinate references

Rule: Queens cannot share a row, column or region, or touch diagonally. R7C7 conflicts with R7C8 through the same row (row 7); with R8C7 through the same column (column 7); with R8C8 through diagonally adjacent cells. R9C8 conflicts with R7C8, R8C8 through the same column (column 8); with R8C7 through diagonally adjacent cells.

Therefore: mark R7C7, R9C8 ×. Every possible Queen in region 9 rules out these cells.

Board after step 9 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
3 cellsR7C8, R8C7, R8C8
 Changed this step (square marker):
2 cellsR7C7, R9C8
Step 10 · Reserved groups

Observe: region 1 and region 8 and region 9 have remaining candidates 8 cells (see details), all within row 1 and row 7 and row 8.

View 8 coordinate references

Observe: region 1 and region 8 and region 9 have remaining candidates R1C2, R1C3, R1C4, R7C1, R7C8, R8C1, R8C7, R8C8, all within row 1 and row 7 and row 8.

Rule: these 3 groups need distinct Queens, filling all 3 target groups.

Therefore: mark 8 cells (see details) ×. These cells lie outside the groups that reserve those Queens.

View 8 coordinate references

Therefore: mark R7C3, R7C4, R7C5, R7C6, R8C3, R8C4, R8C5, R8C6 ×. These cells lie outside the groups that reserve those Queens.

Board after step 10 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
8 cellsR1C2, R1C3, R1C4, R7C1, R7C8, R8C1, R8C7, R8C8
 Changed this step (square marker):
8 cellsR7C3, R7C4, R7C5, R7C6, R8C3, R8C4, R8C5, R8C6
Step 11 · Locked candidates

Observe: region 6 has 2 remaining candidates: R5C2, R6C2. All lie in column 2.

Rule: region 6 needs one Queen, so it will occupy column 2. column 2 can contain no second Queen outside region 6.

Therefore: mark R1C2, R2C2, R3C2, R4C2 ×.

Board after step 11 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
2 cellsR5C2, R6C2
 Changed this step (square marker):
4 cellsR1C2, R2C2, R3C2, R4C2
Step 12 · Locked candidates

Observe: region 3 has 2 remaining candidates: R2C4, R2C5. All lie in row 2.

Rule: region 3 needs one Queen, so it will occupy row 2. row 2 can contain no second Queen outside region 3.

Therefore: mark R2C6, R2C7, R2C8, R2C9 ×.

Board after step 12 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
2 cellsR2C4, R2C5
 Changed this step (square marker):
4 cellsR2C6, R2C7, R2C8, R2C9
Step 13 · Locked candidates

Observe: region 4 has 4 remaining candidates: R3C8, R4C8, R5C8, R6C8. All lie in column 8.

Rule: region 4 needs one Queen, so it will occupy column 8. column 8 can contain no second Queen outside region 4.

Therefore: mark R7C8, R8C8 ×.

Board after step 13 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
4 cellsR3C8, R4C8, R5C8, R6C8
 Changed this step (square marker):
2 cellsR7C8, R8C8
Step 14 · Only candidate

Observe: row 7 has only one remaining candidate: R7C1.

Rule: every row needs exactly one Queen.

Therefore: place a Queen at R7C1. The 2 cells marked × conflict with it by row, column, region or diagonal adjacency.

Board after step 14 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
1 cellsR7C1
 Changed this step (square marker):
3 cellsR6C2, R7C1, R8C1
Step 15 · Only candidate

Observe: row 8 has only one remaining candidate: R8C7.

Rule: every row needs exactly one Queen.

Therefore: place a Queen at R8C7. The 6 cells marked × conflict with it by row, column, region or diagonal adjacency.

Board after step 15 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
1 cellsR8C7
 Changed this step (square marker):
7 cellsR3C7, R4C7, R5C7, R6C7, R8C7, R9C6, R9C7
Step 16 · Only candidate

Observe: column 2 has only one remaining candidate: R5C2.

Rule: every column needs exactly one Queen.

Therefore: place a Queen at R5C2. The 6 cells marked × conflict with it by row, column, region or diagonal adjacency.

Board after step 16 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
1 cellsR5C2
 Changed this step (square marker):
7 cellsR4C3, R5C2, R5C4, R5C5, R5C6, R5C8, R5C9
Step 17 · Locked candidates

Observe: column 6 has 3 remaining candidates: R3C6, R4C6, R6C6. All lie in region 5.

Rule: column 6 needs one Queen, so it will occupy region 5. region 5 can contain no second Queen outside column 6.

Therefore: mark 7 cells (see details) ×.

View 7 coordinate references

Therefore: mark R3C3, R3C4, R3C5, R4C4, R4C5, R6C4, R6C5 ×.

Board after step 17 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
3 cellsR3C6, R4C6, R6C6
 Changed this step (square marker):
7 cellsR3C3, R3C4, R3C5, R4C4, R4C5, R6C4, R6C5
Step 18 · Common exclusions

Observe: row 1 must contain one Queen, chosen from R1C3, R1C4.

Rule: Queens cannot share a row, column or region, or touch diagonally. R2C4 conflicts with R1C3 through diagonally adjacent cells; with R1C4 through the same column (column 4).

Therefore: mark R2C4 ×. Every possible Queen in row 1 rules out these cells.

Board after step 18 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
2 cellsR1C3, R1C4
 Changed this step (square marker):
1 cellsR2C4
Step 19 · Only candidate

Observe: row 2 has only one remaining candidate: R2C5.

Rule: every row needs exactly one Queen.

Therefore: place a Queen at R2C5. The 3 cells marked × conflict with it by row, column, region or diagonal adjacency.

Board after step 19 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
1 cellsR2C5
 Changed this step (square marker):
4 cellsR1C4, R2C5, R3C6, R9C5
Step 20 · Only candidate

Observe: row 1 has only one remaining candidate: R1C3.

Rule: every row needs exactly one Queen.

Therefore: place a Queen at R1C3. The 1 cells marked × conflict with it by row, column, region or diagonal adjacency.

Board after step 20 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
1 cellsR1C3
 Changed this step (square marker):
2 cellsR1C3, R9C3
Step 21 · Only candidate

Observe: row 9 has only one remaining candidate: R9C4.

Rule: every row needs exactly one Queen.

Therefore: place a Queen at R9C4. The 0 cells marked × conflict with it by row, column, region or diagonal adjacency.

Board after step 21 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
1 cellsR9C4
 Changed this step (square marker):
1 cellsR9C4
Step 22 · Common exclusions

Observe: row 3 must contain one Queen, chosen from R3C8, R3C9.

Rule: Queens cannot share a row, column or region, or touch diagonally. R4C8 conflicts with R3C8 through the same column (column 8); with R3C9 through diagonally adjacent cells. R4C9 conflicts with R3C8 through diagonally adjacent cells; with R3C9 through the same column (column 9).

Therefore: mark R4C8, R4C9 ×. Every possible Queen in row 3 rules out these cells.

Board after step 22 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
2 cellsR3C8, R3C9
 Changed this step (square marker):
2 cellsR4C8, R4C9
Step 23 · Only candidate

Observe: row 4 has only one remaining candidate: R4C6.

Rule: every row needs exactly one Queen.

Therefore: place a Queen at R4C6. The 1 cells marked × conflict with it by row, column, region or diagonal adjacency.

Board after step 23 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
1 cellsR4C6
 Changed this step (square marker):
2 cellsR4C6, R6C6
Step 24 · Only candidate

Observe: row 6 has only one remaining candidate: R6C8.

Rule: every row needs exactly one Queen.

Therefore: place a Queen at R6C8. The 1 cells marked × conflict with it by row, column, region or diagonal adjacency.

Board after step 24 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Dots are candidates, × marks excluded cells. Reasoning basis (round marker):
1 cellsR6C8
 Changed this step (square marker):
2 cellsR3C8, R6C8
Step 25 · Only candidate

Observe: row 3 has only one remaining candidate: R3C9.

Rule: every row needs exactly one Queen.

Therefore: place a Queen at R3C9. The 0 cells marked × conflict with it by row, column, region or diagonal adjacency.

Board after step 25 · Small cell numbers identify regions. Rows run from top to bottom; columns from left to right. Queens show the complete solution. Reasoning basis (round marker):
1 cellsR3C9
 Changed this step (square marker):
1 cellsR3C9

A tempting mistake

A Queen at R1C1 looks possible before deductions. Following the forced placements leaves region 6 without a possible Queen. Rule out this tempting assumption.

Check every branch

The only candidate in region 8 forces R9C2.

Region 6 has no possible Queen: contradiction.

Keep practicing