A four-letter route for the superlative clue
For the superlative clue, trace BEST from row 6, column 1. Move right to row 6, column 2, continue right to row 6, column 3, then turn up to row 5, column 3. The letter order is B → E → S → T, and the route stays compact across two rows and three columns.
This is a useful first confirmation because it makes just one turn after two rightward steps. The full coordinate transcript is: 1 at row 6, column 1; 2 at row 6, column 2; 3 at row 6, column 3; 4 at row 5, column 3. It begins on an open cell with two open orthogonal neighbors and ends on one with three, so the final upward move is worth checking carefully against your board.