Level 109 solution

Solver-verified route

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

Part of the "Column craft" chapter. The solver certified 48 solving lines with 95% of in-between placements being dead ends, for a difficulty score of 18.2 (grade 4 of 5).