The current "Code of Points" covers the years 2017 to 2020. Following past editions, there is no top score of 10.0, nor is there an upper limit of the difficulty score. On all apparatuses except vault, official men's skills are rated from A (0.1) to I (0.9) and women's skills from A (0.1) to J (1.0). Currently, there is only one top-rated I (0.9) skill for men, which is the Miyachi on high bar, or double-twisting straight Kovac release, by Hidetaka Miyachi of Japan while there is also only one top-rated J (1.0) skill for women, which is the Biles 2 on floor, or triple-twisting double (tucked) back somersault, by Simone Biles of the United States. Due to the nature of apparatus, the vault event's difficulty scores for men are rated from 1.6 to 6.0 while for women are from 2.0 to 6.4. Currently, there are four men's vaults with the top rate of 6.0, but only two women's vaults with the top rate of 6.4, which are the Produnova, or handspring double front somersault, by Yelena Produnova of Russia, and Biles, or "half on–double full off", by Biles again. Difficulty score of the Yurchenko triple twist (or triple-twisting Yurchenko ) on women's vault has also earlier been assessed ahead to a value of 6.8, and will receive eponymous naming as soon as it is successfully completed (it has already been attempted) in competition.