Here is our hack from the last night - a tool to check the accuracy of your solutions. You can upload your solutions on the following url:
http://datahack.club:8000 in csv format and check what percentage of your solutions are correct!
This should give you a way to measure how accurate is your model vs. other models you might be trying.
We loved creating this tool, hope you would love this as well.
P.S. The tool has been released much before any robust testing. So, if you face any problem, be a bit patient and let us know