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Simplify PV node reduction
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Reduce less on PV nodes even with an upperbound TT entry.

Passed STC:
https://tests.stockfishchess.org/tests/view/65cb3a861d8e83c78bfd0497
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 118752 W: 30441 L: 30307 D: 58004
Ptnml(0-2): 476, 14179, 29921, 14335, 465

Passed LTC:
https://tests.stockfishchess.org/tests/view/65cd3b951d8e83c78bfd2b0d
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 155058 W: 38549 L: 38464 D: 78045
Ptnml(0-2): 85, 17521, 42219, 17632, 72

closes official-stockfish#5057

Bench: 1303971
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cj5716 authored and Disservin committed Feb 17, 2024
1 parent 8e75548 commit fc41f64
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion src/search.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -1111,7 +1111,7 @@ Value Search::Worker::search(
r++;

// Decrease reduction for PvNodes (~3 Elo)
if (PvNode && tte->bound() != BOUND_UPPER)
if (PvNode)
r--;

// Increase reduction on repetition (~1 Elo)
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