My dad is the reason I ever touched a computer - 'Prince of Persia' on a CRT monitor at his office, thirty-five years ago. Now I build interfaces for a living, and he still calls me when ads pop up on his phone. When I moved from Romania to Spain, I wanted to keep one thing going: our chess games. Chess.com felt too complex for him, so I built something simpler. One link, he clicks it, we play. No account, no onboarding. I sent him the link on WhatsApp in April. His reply: "I went to th...