June 15, 1925
Paris on Saturday at the annual meeting of the International Football board here today, under the presidency of Mr. White (Scotland), the Offside rule was altered so that a player shall not be offside if two instead of three opposing players are between him and the opposing goal line. Another decision was that a player throwing in from the touch must stand outside the line, instead of with his feet thereon.
(Liverpool Daily Post and Mercury: June 15, 1925)
The history of Liverpool Football Club, their home at Anfield and all the people.
"Play Up, Liverpool" 
Thanks for the on-going press articles. The date of the amended offside rule, and its alleged impact, is of much interest to me (along with other topics).
Nigel Gibb, Middlesbrough.