The Geochecker is meant to check for the correct solution. The cache owner can determine the number of check attempts the cacher can do during a given period of time.
The service is protected against misuse and automated attempts by several different methods. Attempts to circumvent the protections, abuse and usage against good manners will cause the end user to have restricted number of check attempts, or being banned from the service.
It is considered to be usage against good manners, if the number of check attempts can be assumed to be used for solving the coordinates instead of checking them.
On the front page of the Geochecker there is a form you can use to add your own cache to the Geochecker.