The Motherboard is the large item onto which all other components are plugged. CPU,Memory, sockets for drives and external connectors.
The chipset is a built in feature of the Motherboard and is supplied by various makers such as Intel, VIA etc. this with the Bios actually run the system and control all other functions -
When purchasing a Motherboard- to a given spec you do not get an option- the chip set is built in, its part of the package.
I you read the a certain chipset, is not that writers choice- well its that writers opinion.
Rest assured if the board is on general sale the chip set will do the business, otherwise it wont have got that far.