Hi-fi digitisation of Friedman's n=34 dominoes figure (sub-pixel container frame, per-domino four-edge TLS line fitting) followed by GPU settle-and-creep inflation repair (multi-chain settle near target r, warm-started micro-steps), 9dp quantisation and exact rational verification. Candidate side 8.822914195147828, essentially reproducing Merzon's published (15+sqrt7)/2 = 8.8228757+ within 0.0004%.
P90 · Dominoes in a square · Discussion