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Simplify reduction for consecutive fails

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Revert the heuristic introduced in #3184, by which we reduced more
the late sons of the root position after consecutive fail highs.

---
Before new net architecture:

STC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 226336 W: 20373 L: 20500 D: 185463
Ptnml(0-2): 755, 16087, 79595, 15992, 739
https://tests.stockfishchess.org/tests/view/609dec205085663412d08e9d

LTC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 67432 W: 2411 L: 2375 D: 62646
Ptnml(0-2): 33, 1944, 29714, 2004, 21
https://tests.stockfishchess.org/tests/view/609ee30f5085663412d08fc3

---
After new net architecture:

STC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 141752 W: 11591 L: 11617 D: 118544
Ptnml(0-2): 387, 9231, 51674, 9189, 395
https://tests.stockfishchess.org/tests/view/60a4320ace8ea25a3ef03cfd

LTC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 294072 W: 9825 L: 9950 D: 274297
Ptnml(0-2): 121, 8610, 129681, 8521, 103
https://tests.stockfishchess.org/tests/view/60a51b5ece8ea25a3ef03dcd
---

closes https://github.com/official-stockfish/Stockfish/pull/3490

Bench: 3752892
This commit is contained in:
bmc4 2021-05-22 02:41:52 -03:00 • committed by Stéphane Nicolet
parent fb2d175f97
commit 49c79aa15c
2 changed files with 1 additions and 6 deletions
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6
src/search.cpp
View file

@ -377,7 +377,7 @@ void Thread::search() {
// Start with a small aspiration window and, in the case of a fail // Start with a small aspiration window and, in the case of a fail
// high/low, re-search with a bigger window until we don't fail // high/low, re-search with a bigger window until we don't fail
// high/low anymore. // high/low anymore.
failedHighCnt = 0; int failedHighCnt = 0;
while (true) while (true)
{ {
Depth adjustedDepth = std::max(1, rootDepth - failedHighCnt - searchAgainCounter); Depth adjustedDepth = std::max(1, rootDepth - failedHighCnt - searchAgainCounter);
@ -1157,10 +1157,6 @@ moves_loop: // When in check, search starts from here
if (ttCapture) if (ttCapture)
r++; r++;
// Increase reduction at root if failing high
if (rootNode)
r += thisThread->failedHighCnt * thisThread->failedHighCnt * moveCount / 512;
// Increase reduction for cut nodes (~3 Elo) // Increase reduction for cut nodes (~3 Elo)
if (cutNode) if (cutNode)
r += 2; r += 2;

1
src/thread.h
View file

@ -75,7 +75,6 @@ public:
CapturePieceToHistory captureHistory; CapturePieceToHistory captureHistory;
ContinuationHistory continuationHistory[2][2]; ContinuationHistory continuationHistory[2][2];
Score contempt; Score contempt;
int failedHighCnt;
}; };