mirror of
https://github.com/sockspls/badfish
synced 2025-04-29 16:23:09 +00:00
Extend intermediate LMR to root search
Almost no change, but it is in sync with what we do in search and in any case the ELO difference is very small (because the events when the intermediate research triggers are very rare), too small to be measured, we just verify we don't have any unexpected regressions. After 802 games at 1+0 full QUAD Mod vs Orig +114 =581 -107 +3 ELO Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
parent
5f3c660d5d
commit
9337c6da46
1 changed files with 15 additions and 1 deletions
|
@ -892,17 +892,31 @@ namespace {
|
|||
ss->reduction = reduction<PV>(depth, i - MultiPV + 2);
|
||||
if (ss->reduction)
|
||||
{
|
||||
assert(newDepth-ss->reduction >= OnePly);
|
||||
|
||||
// Reduced depth non-pv search using alpha as upperbound
|
||||
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth-ss->reduction);
|
||||
doFullDepthSearch = (value > alpha);
|
||||
}
|
||||
|
||||
// The move failed high, but if reduction is very big we could
|
||||
// face a false positive, retry with a less aggressive reduction,
|
||||
// if the move fails high again then go with full depth search.
|
||||
if (doFullDepthSearch && ss->reduction > 2 * OnePly)
|
||||
{
|
||||
assert(newDepth - OnePly >= OnePly);
|
||||
|
||||
ss->reduction = OnePly;
|
||||
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth-ss->reduction);
|
||||
doFullDepthSearch = (value > alpha);
|
||||
}
|
||||
ss->reduction = Depth(0); // Restore original reduction
|
||||
}
|
||||
|
||||
// Step 15. Full depth search
|
||||
if (doFullDepthSearch)
|
||||
{
|
||||
// Full depth non-pv search using alpha as upperbound
|
||||
ss->reduction = Depth(0);
|
||||
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth);
|
||||
|
||||
// If we are above alpha then research at same depth but as PV
|
||||
|
|
Loading…
Add table
Reference in a new issue