The 2nd entry in my blog is dedicated to the checkpoint:

Please see the bug report for an overview:
* no uptodate checkpoint: https://github.com/COINFORCHESS/ChessCoin/issues/1

Why is it good to have a checkpoint ?
* at least until the checkpoint time the blockchain can not be manipulated anymore
* the syncing speed for new users will be better
  * since their clients with a newer checkpoint will decline clients which are on a fork

read more also in the new project I created:
* https://github.com/chess-fan/blockhashes-of-ChessCoin

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my ChessCoin blog: https://github.com/chess-fan/thoughts