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