LinkedIn Queens answer for Saturday, October 24: #907

Queens solution, step by step

Each LinkedIn Queens step places one queen and closes its row, its column, its region and the squares touching it.

1. Step 1: The Orange region sits entirely in row 3, so no other queen can go in row 3. The Blue region sits entirely in row 5, so no other queen can go in row 5. The Pink region sits entirely in row 2, so no other queen can go in row 2. The Purple, Orange and Blue regions sit entirely in columns 1, 2 and 3, so no other queen can go in those columns. The Purple, Green, Yellow, Red and Gray regions sit entirely in rows 4, 6, 7, 8 and 9, so no other queen can go in those rows. A queen in row 1, column 6 would leave the Pink region with no open square, so that square is out. A queen in row 1, column 7 would leave the Pink region with no open square, so that square is out. A queen in row 4, column 1 would leave the Orange region with no open square, so that square is out. A queen in row 4, column 2 would leave the Orange region with no open square, so that square is out. A queen in row 4, column 3 would leave the Blue region with no open square, so that square is out. The Purple region sits entirely in row 6, so no other queen can go in row 6. A queen in row 5, column 2 would leave the Purple region with no open square, so that square is out. The Blue region has only one open square left, so its queen goes in row 5, column 3 (R5C3).
2. Step 2: The Purple region has only one open square left, so its queen goes in row 6, column 1 (R6C1).
3. Step 3: The Orange region has only one open square left, so its queen goes in row 3, column 2 (R3C2).
4. Step 4: The Green region sits entirely in column 6, so no other queen can go in column 6. The Pink region has only one open square left, so its queen goes in row 2, column 7 (R2C7).
5. Step 5: Row 4 has only one open square left, so its queen goes in column 6 (Green region) (R4C6).
6. Step 6: The Yellow region sits entirely in column 9, so no other queen can go in column 9. The Teal and Gray regions sit entirely in columns 4 and 5, so no other queen can go in those columns. A queen in row 7, column 8 would leave the Yellow region with no open square, so that square is out. A queen in row 8, column 8 would leave the Yellow region with no open square, so that square is out. The Red region has only one open square left, so its queen goes in row 9, column 8 (R9C8).
7. Step 7: The Yellow region has only one open square left, so its queen goes in row 7, column 9 (R7C9).
8. Step 8: The Gray region has only one open square left, so its queen goes in row 8, column 4 (R8C4).
9. Step 9: The Teal region has only one open square left, so its queen goes in row 1, column 5 (R1C5).

Answer coordinates: R1C5, R2C7, R3C2, R4C6, R5C3, R6C1, R7C9, R8C4, R9C8