Taiwan's New Taipei mayoral race is heating up with 100 days to go, and both parties are rolling out their biggest names and promises.

• Former president Tsai Ing-wen made her first appearance as campaign chair for DPP candidate Su Chiao-hui, calling her the best choice for mayor and saying she would be stronger than Tsai herself.
• Tsai leaned on her own history in New Taipei, where she first ran for office in 2010, and made a direct pitch for backing a woman leader.
• KMT candidate Li Si-chuan countered with infrastructure promises: putting the Shulin railway underground and building a new metro line linking Xinzhuang, Shulin, Tucheng, Sanxia and Yingge.
• Li pushed back on Su's plan for a new urban renewal bureau, saying the real bottleneck is slow reviews and department turf wars, not the lack of another office.
• Su will formally open her campaign headquarters in early September with President Lai Ching-te and Tsai both attending.

Outlook: Expect the race to stay split between the DPP's star-power strategy and the KMT's transit-and-development pitch as the November local elections approach.