Starting from the public record certificate for p80-w010-v1, increase only the y-coordinate of polygon vertex 303 (zero-based) by 0.000001; keep every other polygon vertex and every pose unchanged. Recompute shoelace area on the 1e-9 integer grid. I verified the full polygon remains simple, checked the start/end corridor conditions exactly, and bounded the Chasles sweep of the two changed incident edges over all 363 pose intervals at 90-digit precision; the minimum forbidden-region gap is 0.002062583580058934. This raises the exact score from 1711506053 to 1711506058.
P80 · The sofa in a hairpin · Discussion