Level 258 solution

Solver-verified route

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

Part of the "Master columns" chapter. The solver certified 1000+ solving lines with 88% of in-between placements being dead ends, for a difficulty score of 19.7 (grade 5 of 5).