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Update Elo estimates for terms in search

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Setting the Elo value of some functions which were not set before.
All tests run at 10+0.1 (STC), 25000 games (Same as #4294).
Book used: UHO_XXL_+0.90_+1.19.epd

Values are rounded to the nearest non-negative integer.

Test links:
https://tests.stockfishchess.org/tests/view/6419ab5b65775d3b539f46c6
https://tests.stockfishchess.org/tests/view/6419adb465775d3b539f4730
https://tests.stockfishchess.org/tests/view/6419ae9c65775d3b539f4756
https://tests.stockfishchess.org/tests/view/6419b03f65775d3b539f47a8
https://tests.stockfishchess.org/tests/view/6419b35d65775d3b539f4860
https://tests.stockfishchess.org/tests/view/6419b6b965775d3b539f48e6
https://tests.stockfishchess.org/tests/view/6419cade65775d3b539f4cd5
https://tests.stockfishchess.org/tests/view/6419cbb565775d3b539f4d01
https://tests.stockfishchess.org/tests/view/6419cc6965775d3b539f4d1e

closes https://github.com/official-stockfish/Stockfish/pull/4459

No functional change
This commit is contained in:
FauziAkram 2023-03-21 23:58:25 +03:00 • committed by Joost VandeVondele
parent 24b37e4586
commit b973e40e45
1 changed files with 11 additions and 11 deletions
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22
src/search.cpp
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@ -732,7 +732,7 @@ namespace {
}
else if (excludedMove)
{
// Providing the hint that this node's accumulator will be used often brings significant Elo gain (13 elo)
// Providing the hint that this node's accumulator will be used often brings significant Elo gain (13 Elo)
Eval::NNUE::hint_common_parent_position(pos);
eval = ss->staticEval;
complexity = abs(ss->staticEval - pos.psq_eg_stm());
@ -1120,15 +1120,15 @@ moves_loop: // When in check, search starts here
else if (singularBeta >= beta)
return singularBeta;
// If the eval of ttMove is greater than beta, we reduce it (negative extension)
// If the eval of ttMove is greater than beta, we reduce it (negative extension) (~7 Elo)
else if (ttValue >= beta)
extension = -2 - !PvNode;
// If the eval of ttMove is less than value, we reduce it (negative extension)
// If the eval of ttMove is less than value, we reduce it (negative extension) (~1 Elo)
else if (ttValue <= value)
extension = -1;
// If the eval of ttMove is less than alpha, we reduce it (negative extension)
// If the eval of ttMove is less than alpha, we reduce it (negative extension) (~1 Elo)
else if (ttValue <= alpha)
extension = -1;
}
@ -1182,7 +1182,7 @@ moves_loop: // When in check, search starts here
if (ttCapture)
r++;
// Decrease reduction for PvNodes based on depth
// Decrease reduction for PvNodes based on depth (~2 Elo)
if (PvNode)
r -= 1 + 12 / (3 + depth);
@ -1195,11 +1195,11 @@ moves_loop: // When in check, search starts here
&& (mp.threatenedPieces & from_sq(move)))
r--;
// Increase reduction if next ply has a lot of fail high
// Increase reduction if next ply has a lot of fail high (~5 Elo)
if ((ss+1)->cutoffCnt > 3)
r++;
// Decrease reduction if move is a killer and we have a good history
// Decrease reduction if move is a killer and we have a good history (~1 Elo)
if (move == ss->killers[0]
&& (*contHist[0])[movedPiece][to_sq(move)] >= 3722)
r--;
@ -1210,7 +1210,7 @@ moves_loop: // When in check, search starts here
+ (*contHist[3])[movedPiece][to_sq(move)]
- 4182;
// Decrease/increase reduction for moves with a good/bad history (~30 Elo)
// Decrease/increase reduction for moves with a good/bad history (~25 Elo)
r -= ss->statScore / (11791 + 3992 * (depth > 6 && depth < 19));
// Step 17. Late moves reduction / extension (LMR, ~117 Elo)
@ -1347,7 +1347,7 @@ moves_loop: // When in check, search starts here
{
alpha = value;
// Reduce other moves if we have found at least one score improvement
// Reduce other moves if we have found at least one score improvement (~1 Elo)
if ( depth > 1
&& depth < 6
&& beta < 10534
@ -1413,7 +1413,7 @@ moves_loop: // When in check, search starts here
bestValue = std::min(bestValue, maxValue);
// If no good move is found and the previous position was ttPv, then the previous
// opponent move is probably good and the new position is added to the search tree.
// opponent move is probably good and the new position is added to the search tree. (~7 Elo)
if (bestValue <= alpha)
ss->ttPv = ss->ttPv || ((ss-1)->ttPv && depth > 3);
@ -1432,7 +1432,7 @@ moves_loop: // When in check, search starts here
// qsearch() is the quiescence search function, which is called by the main search
// function with zero depth, or recursively with further decreasing depth per call.
// (~155 elo)
// (~155 Elo)
template <NodeType nodeType>
Value qsearch(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth) {