USD/CNY is the onshore yuan. Its permitted to trade plus or minus 2% from this daily reference rate.
CNH is the offshore yuan. USD/CNH has no restrictions on its trading range.
A significantly stronger or weaker rate than expected is typically considered a signal from the PBOC.
Previous close was 6.3666The PBOC inject 10bn yuan via 7 day reverse repos (rate remains at 2.1%)
20bn yuan mature today
thus net 10bn drain in OMO on the day