When you accept the patches that win more at ltc, you end with an engine that is stronger at ltc.tpetzke wrote:But another interpretation could be that your eval is superior to the one of your opponents and so in short TC matches (where eval gets more pressure) your engine is very strong. In long TC matches your opponents can compensate a bit their worse eval by searching longer (eval gets a bit less pressure).Also when you see CCRL 40/40 and CCRL 40/4 is clear something has gone bad, as 0.84 has more rating (in one CPU for the moment) in 40/4, when the objective is the other way, and not by a little margin but at least 30 elo.
As I don't have the resources to test at long TC anyway I don't care. I tune at short TC and at long TC it is as it is.
I was no cautious enough at least for king safety and passed pawn ones, and as a result Andscacs 0.84 showed clear bad tuning and loses quite easy some games, thing that I think that happened less with previous version.
So the verification of this is that now as I retune by hand those parameters, at least with some ones I'm wining some strength back just returning to old values or near those old values, so those parameters where bad automatically tuned.
Of course I cannot be absolutely sure of this, because I cannot try really at longest time controls, but I expose what I have achieved working like this with previous versions.
Many times you see the effect with really fast time control games. So for example you can test at 5 seconds +0.03 and then at 11 + 0.03 and you already see that at 11 the change is less bad that at 5, or if you have luck, that is already good. Sometimes this does not scales further, so if is less bad at 11, better try at 20 or more if you are able to, or if not, better discard the patch.