Solver-verified route
- Place Piece 1 across column 7 row 3, column 8 row 3, column 7 row 4, column 8 row 4.
- Place Piece 2 across column 7 row 5, column 8 row 5, column 7 row 6, column 8 row 6.
- Place Piece 3 at column 7, row 7.
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 14.8 (grade 2 of 5).