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Introduce DistanceFromPV

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We introduce a metric for each internal node in search, called DistanceFromPV.
This distance indicated how far the current node is from the principal variation.

We then use this distance to search the nodes which are close to the PV a little
deeper (up to 4 plies deeper than the PV): this improves the quality of the search
at these nodes and bring better updates for the PV during search.

STC:
LLR: 2.96 (-2.94,2.94) {-0.25,1.25}
Total: 54936 W: 5047 L: 4850 D: 45039
Ptnml(0-2): 183, 3907, 19075, 4136, 167
https://tests.stockfishchess.org/tests/view/6037b88e7f517a561bc4a392

LTC:
LLR: 2.95 (-2.94,2.94) {0.25,1.25}
Total: 49608 W: 1880 L: 1703 D: 46025
Ptnml(0-2): 22, 1514, 21555, 1691, 22
https://tests.stockfishchess.org/tests/view/6038271b7f517a561bc4a3cb

Closes https://github.com/official-stockfish/Stockfish/pull/3369

Bench: 5037279
This commit is contained in:
Stéphane Nicolet
2021-02-26 10:13:37 +01:00
committed by Joost VandeVondele
parent 7c30091a92
commit 0f3f5d85fb
2 changed files with 16 additions and 8 deletions
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src/search.h
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@@ -47,6 +47,7 @@ struct Stack {
Value staticEval;
int statScore;
int moveCount;
int distanceFromPv;
bool inCheck;
bool ttPv;
bool ttHit;