LMR+PVS

[ChizhovVadim]

I think, if LMR>0, research should be if score > alpha without score < beta. Or I do not understand how it works :-).

score := -e.alphaBeta(depthLeft-1-LMR, searchHeight+1, -alpha-1, -alpha)
if score > alpha && (LMR>0||score < beta) {
...
}

zahak/search/search.go

Lines 745 to 751 in 72ff806

	score := -e.alphaBeta(depthLeft-1-LMR, searchHeight+1, -alpha-1, -alpha)
	e.pred.Pop()
	if score > alpha && score < beta {
	// research with window [alpha;beta]
	e.pred.Push(position.Hash())
	e.innerLines[searchHeight+1].Recycle()
	score = -e.alphaBeta(depthLeft-1, searchHeight+1, -beta, -alpha)

[amanjpro]

Yeah, I doubt the beta will change anything really... it might hurt too. Will check it :)
Thanks for the report :)