first official
...that in 1886, Wilhelm Steinitz won the first official World Chess Championship?
...that in 1886, <a href="./Wilhelm_Steinitz" id="mwEAA" rel="mw:WikiLink" title="Wilhelm Steinitz">Wilhelm Steinitz</a> won the <b id="mwEAE"><a href="./World_Chess_Championship_1886" id="mwEAI" rel="mw:WikiLink" title="World Chess Championship 1886">first official</a></b> <a href="./World_Chess_Championship" id="mwEAM" rel="mw:WikiLink" title="World Chess Championship">World Chess Championship</a>?