Solver-verified route
- Place Piece 1 across column 3 row 1, column 3 row 2.
- Place Piece 2 across column 4 row 1, column 4 row 2.
- Place Piece 3 across column 4 row 6, column 4 row 7.
Part of the "Vertical thinking" chapter. The solver certified 6 solving lines with 93% of in-between placements being dead ends, for a difficulty score of 15.5 (grade 2 of 5).