Level 273 solution

Solver-verified route

1. Place Piece 1 across column 5 row 2, column 6 row 2, column 5 row 3.
2. Place Piece 2 across column 4 row 4, column 4 row 5, column 5 row 5, column 4 row 6.
3. Place Piece 3 at column 5, row 4.
4. Place Piece 4 at column 3, row 6.
5. Place Piece 5 across column 2 row 5, column 2 row 6, column 2 row 7.
6. Place Piece 6 across column 7 row 1, column 8 row 1, column 7 row 2, column 8 row 2.
7. Place Piece 7 across column 3 row 2, column 4 row 2, column 4 row 3.

Part of the "Master columns" chapter. The solver certified 1000+ solving lines with 74% of in-between placements being dead ends, for a difficulty score of 18.8 (grade 4 of 5).