Level 117 solution

Solver-verified route

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

Part of the "Column craft" chapter. The solver certified 48 solving lines with 96% of in-between placements being dead ends, for a difficulty score of 17.9 (grade 3 of 5).