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One proposed change was a widening of the playing field. However, Harvard University had just built a concrete stadium and therefore objected to widening, instead proposing legalisation of the forward pass. The report of the meetings introduced many restrictions on tackling and two more divergences from rugby: the forward pass and the banning of mass formation plays. The changes did not immediately have the desired effect, and 33 American football players were killed during 1908 alone. However, the number of deaths and injuries did gradually decline.
• Further divergence of the two rugby codes
Rugby league rules diverged significantly from rugby union in 1906, with the reduction of the team from 15 to 13 players. In 1907, a New Zealand professional rugby team toured Australia and Britain, receiving an enthusiastic response, and professional rugby leagues were launched in Australia the following year. However, the rules of professional games varied from one country to another, and negotiations between various national bodies were required to fix the exact rules for each international match. This situation endured until 1948, when at the instigation of the French league, the Rugby League International Federation (RLIF) was formed at a meeting in Bordeaux.
During the second half of 20th century, the rules changed further. In 1966, rugby league officials borrowed the American football concept of downs: a team could retain possession of the ball for no more than four tackles. The maximum number of tackles was later increased to six (in 1971), and in rugby league this became known as the six tackle rule.