Level 59 solution

Solver-verified route

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

Part of the "Vertical thinking" chapter. The solver certified 6 solving lines with 98% of in-between placements being dead ends, for a difficulty score of 16.3 (grade 2 of 5).