idea: null-move analogy

[Michael Sherwin]

Ok I found +20 elo with depth/2
depth/4 running ...

I tried depth/4 and it was not as good as just depth = 1. Do you notice a speed increase that could account for 20 elo or is something else happening? I suspect that something else is happening that takes advantage of an unmodified null move. This seems to be showing up in testing against some engines. Romi's best result ever against OliThink532 was 72%. After 28 games the score is 22w 2l 4d for 85.7%!

[xr_a_y]

I don't rely on "speed" as knps a lot because the less I prune, the faster the engine seems to be. Minic can get up to 4Mnps if no pruning is perform, only 1.1Mnps with everything activated.
I your are talking time to depth, then, I didn't test... sorry.

at depth/4 I'm getting 105-81-238 right now, not really convincing, maybe +20 also ...

I'll try your depth=1 idea after that.

[xr_a_y]

This little test gives me another idea /question. Shall the returned score of the closed window qsearch done for razoring or the closed window little search done before nullmove be used to update evalscore? Evalscore is often used later to trigger other prunings or extension...

Maybe the evalscore can be replaced by a small iid search even at not pv nodes?

[Michael Sherwin]

This little test gives me another idea /question. Shall the returned score of the closed window qsearch done for razoring or the closed window little search done before nullmove be used to update evalscore? Evalscore is often used later to trigger other prunings or extension...

Maybe the evalscore can be replaced by a small iid search even at not pv nodes?

That sounds reasonable. And then using that score should be a lot more accurate than using the on spot eval. I will give it a try.