Solver-verified route
- Place Piece 1 at column 5, row 4.
- Place Piece 2 across column 6 row 4, column 6 row 5.
- Place Piece 3 across column 5 row 3, column 6 row 3.
Part of the "Vertical thinking" chapter. The solver certified 6 solving lines with 98% of in-between placements being dead ends, for a difficulty score of 16.2 (grade 2 of 5).