able to give many of their pupils the chance of playing, rather than just a few very talented students, as was the case with the School Girls' Championships held by the New South Wales Lawn Tennis Association. Tildesley was inspired by American tennis tournaments in determining how her competition would be scored. In such tournaments, a percentage of games won against games played is taken. This system of scoring has often been criticised over the years, particularly by the larger schools, and to this day it remains highly unusual for a large school to win the Tildesley Shield. It is however apparent that the reasoning that prompted Tildesley was that of encouraging more participation in tennis among the 12 Protestant schools operating in 1918, and to have a scoring system which rewarded the school with the best average. Until 1922, the competition was managed by the Girls Secondary Schools Lawn Tennis Association, and after this time, the Girls Secondary Schools Sports Union (now IGSSA). From 1922 until 1944, the Tildesley Shield was held, where possible, on three consecutive Saturdays in October at White City Stadium. In 1918 it was held at the Double Bay Courts, as White City was then a fun parlour which was taken over for grass courts circa 1920–21. Matches were the best of eight games, with entries based on a 1:15 ratio for girls 12 years and over on 1 October, with a minimum of 12 (6 singles, 3 doubles) and a maximum of 32 (16 singles, 8 doubles). From 1944 to 1946, the numbers were modified to 1:25, with a minimum of eight (4 singles, 2 doubles) and a maximum of 20 (10 singles, 5 doubles). In 1947 it reverted to the original scheme until 1971 when the entry scheme was redrafted. In 1980, it was again redrafted to a system of a 1:22 ratio, by Miss Patti Dyson, then Headmistress of PLC Sydney. All matches are now one set only, first to 9 games, no advantage. A tie-breaker is used at 7–all in quarter finals, semi-finals and finals only. Games won, games lost, games played in all singles and doubles matches are totalled for each school, with the final percentage for each school being the number of games won over the number of games played. The continuous attempts to redraft the conditions of the Shield are largely due to the prestigious place the competition