Level 179 solution

Solver-verified route

1. Place Piece 1 across column 4 row 4, column 3 row 5, column 4 row 5.
2. Place Piece 3 across column 6 row 7, column 5 row 8, column 6 row 8.
3. Place Piece 2 across column 3 row 6, column 4 row 6, column 5 row 6, column 6 row 6.
4. Place Piece 4 across column 2 row 5, column 2 row 6.
5. Place Piece 5 across column 7 row 5, column 7 row 6, column 7 row 7.
6. Place Piece 6 across column 2 row 7, column 3 row 7, column 3 row 8, column 4 row 8.

Part of the "Deep board" chapter. The solver certified 720 solving lines with 94% of in-between placements being dead ends, for a difficulty score of 19.1 (grade 4 of 5).