I would :

1. go to when the system started losing and do a chi test from that point
2. compare the result to the overall chi test results (all selections)
3. Find your median odds in each range
4. Find your average odds in each range
5. Find your strike rate in each period
6. What's your amounts of bets per week in each period

Compare the results. What has happened ? Do you still have an edge and its just been an unlucky run ? Do the tests show you that you no longer have an edge.

What was your median and average dividend range before when it was winning compared to when it was losing ?

Has the amount of bets changed per week?

Has the strike rate changed ?

I just looked and saw it was only 113 selections. There could be your problem. Its not enough data to any analysis on really to decide if you have an edge and whether it has gone. you really need 300+ for testing, 300+ for paper testing and then evaluate a system after 300+ of real life testing. 113 means you should still be in the testing phase or paper testing.


If you can do the above tests and post your results and I might be able to help you.