Notable Innovations
For the first time, substitutions were allowed in World Cup play. Each team were allowed to make two substitutions during a match. The Soviet Union were the first team to make a substitution in World Cup history against Mexico in the opening match. Viktor Serebryanikov was the first player to be replaced, by Anatoliy Puzach after 45 minutes.
This World Cup also featured the first ever use of yellow and red cards for cautions and expulsions respectively. (Note that cautions and expulsions already existed prior to 1970.) Five yellow cards were shown in the opening Mexico vs USSR match, while no red cards were given in the tournament. The idea of language-neutral coloured cards originated with British referee Ken Aston, who got the idea while sitting in his car at a traffic light.
Read more about this topic: 1970 FIFA World Cup
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