Solver-verified route
- Place Piece 1 across column 1 row 7, column 2 row 7.
- Place Piece 2 across column 1 row 4, column 1 row 5, column 2 row 5, column 1 row 6.
- Place Piece 3 across column 1 row 2, column 2 row 2, column 1 row 3.
Part of the "Vertical thinking" chapter. The solver certified 6 solving lines with 97% of in-between placements being dead ends, for a difficulty score of 16.0 (grade 2 of 5).