Solver-verified route
- Place Piece 1 across column 5 row 5, column 6 row 5.
- Place Piece 2 across column 5 row 6, column 6 row 6, column 5 row 7, column 6 row 7.
- Place Piece 3 across column 5 row 2, column 5 row 3, column 5 row 4.
Part of the "Vertical thinking" chapter. The solver certified 12 solving lines with 96% of in-between placements being dead ends, for a difficulty score of 15.8 (grade 2 of 5).