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Document Elo impact of the LMR part of search

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Similar to before, document Elo impact of various LMR steps

Tests run by @jerrydonaldwatson

t1 http://tests.stockfishchess.org/tests/view/5abece950ebc591a560aad0b
t2 http://tests.stockfishchess.org/tests/view/5abecf0c0ebc591a560aad0d
t3 http://tests.stockfishchess.org/tests/view/5abecf7b0ebc591a560aad0f
t4 http://tests.stockfishchess.org/tests/view/5abecfe70ebc591a560aad14
t5 http://tests.stockfishchess.org/tests/view/5abed42b0ebc591a560aad33
t6 http://tests.stockfishchess.org/tests/view/5abed0b90ebc591a560aad19
t7 http://tests.stockfishchess.org/tests/view/5abed1240ebc591a560aad1b
t8 http://tests.stockfishchess.org/tests/view/5abed1b90ebc591a560aad1d

No functional change.
This commit is contained in:
Joost VandeVondele 2018-04-18 19:17:16 +02:00 • committed by Stéphane Nicolet
parent 108f0da4d7
commit 0143c6f0c2
1 changed files with 8 additions and 8 deletions
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16
src/search.cpp
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@ -978,29 +978,29 @@ moves_loop: // When in check, search starts from here
{
Depth r = reduction<PvNode>(improving, depth, moveCount);
if (captureOrPromotion)
if (captureOrPromotion) // (~5 Elo)
r -= r ? ONE_PLY : DEPTH_ZERO;
else
{
// Decrease reduction if opponent's move count is high
// Decrease reduction if opponent's move count is high (~5 Elo)
if ((ss-1)->moveCount > 15)
r -= ONE_PLY;
// Decrease reduction for exact PV nodes
// Decrease reduction for exact PV nodes (~0 Elo)
if (pvExact)
r -= ONE_PLY;
// Increase reduction if ttMove is a capture
// Increase reduction if ttMove is a capture (~0 Elo)
if (ttCapture)
r += ONE_PLY;
// Increase reduction for cut nodes
// Increase reduction for cut nodes (~5 Elo)
if (cutNode)
r += 2 * ONE_PLY;
// Decrease reduction for moves that escape a capture. Filter out
// castling moves, because they are coded as "king captures rook" and
// hence break make_move().
// hence break make_move(). (~5 Elo)
else if ( type_of(move) == NORMAL
&& !pos.see_ge(make_move(to_sq(move), from_sq(move))))
r -= 2 * ONE_PLY;
@ -1011,14 +1011,14 @@ moves_loop: // When in check, search starts from here
+ (*contHist[3])[movedPiece][to_sq(move)]
- 4000;
// Decrease/increase reduction by comparing opponent's stat score
// Decrease/increase reduction by comparing opponent's stat score (~10 Elo)
if (ss->statScore >= 0 && (ss-1)->statScore < 0)
r -= ONE_PLY;
else if ((ss-1)->statScore >= 0 && ss->statScore < 0)
r += ONE_PLY;
// Decrease/increase reduction for moves with a good/bad history
// Decrease/increase reduction for moves with a good/bad history (~30 Elo)
r = std::max(DEPTH_ZERO, (r / ONE_PLY - ss->statScore / 20000) * ONE_PLY);
}