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Disable IIR and quiet shallow pruning in PV lines

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Disable IIR and quiet shallow pruning in nodes that are part of the PV
line from the previous search iteration. This is done by storing the PV
in Worker and adding a followPV flag to Stack. The new flag may also be
used in other pruning techniques, allowing further improvement.

Passed STC:
```
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 63776 W: 16679 L: 16323 D: 30774
Ptnml(0-2): 169, 7441, 16377, 7667, 234
```
https://tests.stockfishchess.org/tests/view/69aad1a7d0f65de95886e289

Passed LTC:
```
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 87342 W: 22421 L: 22000 D: 42921
Ptnml(0-2): 40, 9443, 24299, 9834, 55
```
https://tests.stockfishchess.org/tests/view/69ab5993cb31ee884aed629d

closes https://github.com/official-stockfish/Stockfish/pull/6656

Bench: 2434614
This commit is contained in:
ZlomenyMesic
2026-03-18 20:49:06 +01:00
committed by Disservin
parent b3a810a1c4
commit e20ef7ed12
3 changed files with 15 additions and 3 deletions
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@@ -270,6 +270,7 @@ windfishballad
xefoci7612
Xiang Wang (KatyushaScarlet)
Yen-Chao Shen (lemteay)
ZlomenyMesic
zz4032
# Additionally, we acknowledge the authors and maintainers of fishtest,