George Tsavdaris wrote: Since Stockfish is not commercial why you don't reveal this method? Or do you plan do make it commercial one time in the future?
Also your powerful system of tuning material coefficients indeed sounds very powerful and extremely interesting! I hope that you will reveal it in the future.
It is quite possible that it will be revealed some time in the future, although it is currently not planned. This will probably be up to Joona to decide, since he invented the method and wrote the program to do the tuning.
Some additional information and clarification:
This is not a system for tuning material coefficients, but for tuning evaluation parameters in general. In fact, the material coefficient tuning was largely a failure. Although it did seem to give us some improvement, it wasn't as much as we hoped, and a little disappointing considering the very long time we tried to tune it. We believe that we need some very different form of automatic tuning to get anywhere close to optimal values for the material parameters.
Although there are some clever ideas, the technique is far from magic. It still involves playing thousands of automated games and changing parameter values based on the results, just like everybody does. However, the parameters are tuned by a program rather than by a human programmer. Like with many other optimization methods, the parameters will generally end up close to a local optimum rather than a global optimum.
If there is any interest, I'll try to explain the idea behind the material balance evaluation in a different post. Such a post probably should probably be posted on the programming sub-forum, and not here.