Kammala wannan jumla: Idan aka kwatanta da manyan wasannin da suka gabata kamar gasar wasan chess ta London 1851,
Gasar wasan chess ta London 1862 da Paris 1867, akwai manyan sabbin abubuwa guda biyu: an yi amfani da agogo na chess a karon farko (dole ne a yi motsi 20 a kowace awa), kuma ana yin la'akari da rabin maki.