Actually a good question, whilst I reckon I have a fairly good knowledge of rugby league history - ie: when clubs exited to comp - Glebe, Annandale, Uni etc, when clubs joined the comp - Saints, Canterbury etc, the past champions of the game from 1908; I now realised my knowledge is still just limited.
Like in 1908, rugby league was played under rugby union rules ie: ruck, mauls, breakaways etc.
Therefore, some questions I don't know the answers to are:
- when were the breakawys dropped - reducing the numbers from 15 to 13
- when did the 'play the ball' replace rucks and mauls
- when did the offside from from the 'play the ball' for attackers and defenders come into the rules - original a 1 yard rule I believe.