Four cells along two straight segments
Begin CHIC at row 4, column 5, move down once, and then go left twice. The full numbered trace is 1 at row 4, column 5; 2 at row 5, column 5; 3 at row 5, column 4; 4 at row 5, column 3. Reading those cells in order gives C → H → I → C without reversing or skipping a position.
This four-cell path makes one turn and forms two straight segments. It spans two rows and three columns, with all four visits on an edge and one visit at a corner. The starting cell has two open orthogonal neighbors, while the ending cell has three. Nothing is assigned before this route; afterward, four cells are accounted for and 18 remain.