Using BT2450 and BT2630 Test Suites can provide an estimated rating.
They should contain 30 positions each.
Enter each position into your computer, and let it think for 15 minutes (900 seconds).
If a position is solved, write down its solution time in seconds.
It does not count as a solution if the program finds, the move and then changes its mind.
If after finding a move, then changing its mind, then finding it again, you should use the last time found.
Any solution that is not found, score as 900 seconds.
Add up all the times.
Divide by 30.
Subtract the result from either 2630 or 2450.
The final figure is the ELO rating.
If you find all positions in the BT2630 in 0“ seconds, you have 2630 ELO.
The BT2450 was too easy for the strong tactic programs, so B and T exchanged some positions and the result is the BT2630 test-suite.
BT2450
BT2630
Bratko-Kopec-Test
Nolot
Win at Chess