Solver-verified route
- Place Piece 1 at column 5, row 4.
- Place Piece 2 at column 6, row 4.
- Place Piece 3 across column 6 row 5, column 6 row 6.
Part of the "Vertical thinking" chapter. The solver certified 12 solving lines with 95% of in-between placements being dead ends, for a difficulty score of 15.9 (grade 2 of 5).