the world to participate in the RoboCup autonomous soccer competition Four-Legged Robot Soccer League. Competing teams would program a team of AIBO robots to play games of autonomous robot soccer against other competing teams. The Four-Legged League ran from 1999 to 2008, although in the final year, many big-name universities did not compete as they had moved to the new NAO platform. The University of New South Wales was the most successful team in the League, making the final six times and winning three times. International AIBO Convention The International AIBO Convention takes place every year at Sony Robotics Tower in the Shinjuku prefecture of Tokyo, Japan. The first convention took place on 15 May 1999. It was then set to 2–4 May. The 2009 convention, being in its tenth year, set attendance records. The convention usually features AIBO advertisements, free posters, free accessories, freeware/open-source downloads and AIBO demonstrations. Breed lineage After model name: body-color choices; release date; units sold. First generation models ERS-110: warm silver; began sales 1 June 1999 for delivery in August; limited production of 3,000 for Japan and 2,000 for the USA (5,000 total). ERS-111: silver and black; November 1999 and released again in February 2000. Total sales of ERS-111 models were 40,000. Second generation models ERS-210: initially released in black, gold, and silver; 2001 Following the release of the first three, several special edition colors were released including Spring White, Spring Orange, Everest White (Pearlescent with pink and blue undertones), Mazeran Green, and Sapphire Violet ERS-210A "Supercore": Once again released in black, gold and silver; 2002 Following initial release several new special edition colors were released including Holiday Red, Holiday White, and lastly the Cyber Blue in 2003 ERS-220: silver; 2001 and re-released as the ERS-220A in 2002. The most widespread/best-selling AIBO series: estimated amount of 210/220 AIBOs sold: between 65,000 and 100,000. Third generation models ERS-311 "Latte": cream; 2001 ERS-312 "Macaron": black; 2001 ERS-31L "Pug": brown; 2002 ERS-311B "Latte": cream; 2002 ERS-312B "Macaron": black; 2002 Estimated amount sold: between 30,000 and 35,000. Fourth generation models ERS-7: white; 1st gen, November 2003 ERS-7M2: white and black; 2nd gen, November 2004 ERS-7M3: white, black, and champagne gold (called honey brown in Japan); 3rd gen, October 2005 Estimated sales for all ERS-7 Aibo models: 40,000 to 50,000 Fifth generation models ERS-1000: ivory white; January 2018 ERS-1000: choco edition; January 2019 ERS-1000: caramel edition; January 2020 ERS-1000: black