Reading this maze
Around the corner starts at row 1, column 1. Of the 9 grid positions, 5 are paintable and 4 are walls. The start is already painted; the other 4 tiles remain to be reached.
Slide down the left corridor until the bottom wall stops you, then turn right along the three-tile lower arm.
The verified opening crosses 2 tiles before stopping. A breadth-first search proves a 2-slide finish from this exact starting board; that is a reference target, not a move limit. You may revisit any painted tile.
