Level 264 solution

Solver-verified route

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

Part of the "Master columns" chapter. The solver certified 1000+ solving lines with 90% of in-between placements being dead ends, for a difficulty score of 19.9 (grade 5 of 5).