Gwoyeu Romatzyh
Wade–Giles (for Mandarin) continued to co-exist with several official but obscure romanizations in succession: Gwoyeu Romatzyh (GR), Mandarin Phonetic Symbols II (MPS II, 1986), and Tongyong Pinyin (2002). Taiwan then switched to Hanyu Pinyin in 2009, which had become the international standard for romanized Chinese in the previous decades.