World Rugby introduces world rankings for Women's 15s game

World Rugby has announced details of the first-ever official global ranking system for women's Test rugby, with New Zealand the first team to top the rankings.The rankings were introduced after a comprehensive process of obtaining and analysing every result from the first official women's international matches dating back to 1987 and are based on the same criteria as the men's rankings. Fans will not have to wait long for some big rankings clashes as three of the top five teams will go head-to-head during this year's RBS 6 Nations, which kicks off this weekend.The new system, which comes into…