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Slow down reductions

After testing on Joona QUAD the whole LMR series:

Orig - Mod: 335 - 405 (+33 elo)

Functionality Signature: 12581900

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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1 parent 49b1c5d commit e2e360fcbc02e0ca3329a36766239e7175501103 @zamar zamar committed with Jan 4, 2010
Showing with 5 additions and 5 deletions.
  1. +5 −5 src/search.cpp
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10 src/search.cpp
@@ -969,7 +969,7 @@ namespace {
&& !captureOrPromotion
&& !move_is_castle(move))
{
- double red = ln(RootMoveNumber - MultiPV + 1) * ln(depth / 2) / 3.0;
+ double red = 0.5 + ln(RootMoveNumber - MultiPV + 1) * ln(depth / 2) / 6.0;
if (red >= 1.0)
{
ss[0].reduction = Depth(int(floor(red * int(OnePly))));
@@ -1226,7 +1226,7 @@ namespace {
&& !move_is_castle(move)
&& !move_is_killer(move, ss[ply]))
{
- double red = ln(moveCount) * ln(depth / 2) / 3.0;
+ double red = 0.5 + ln(moveCount) * ln(depth / 2) / 6.0;
if (red >= 1.0)
{
ss[ply].reduction = Depth(int(floor(red * int(OnePly))));
@@ -1557,7 +1557,7 @@ namespace {
&& !move_is_killer(move, ss[ply])
/* && move != ttMove*/)
{
- double red = ln(moveCount) * ln(depth / 2) / 1.5;
+ double red = 0.5 + ln(moveCount) * ln(depth / 2) / 3.0;
if (red >= 1.0)
{
ss[ply].reduction = Depth(int(floor(red * int(OnePly))));
@@ -1902,7 +1902,7 @@ namespace {
&& !move_is_castle(move)
&& !move_is_killer(move, ss[sp->ply]))
{
- double red = ln(moveCount) * ln(sp->depth / 2) / 1.5;
+ double red = 0.5 + ln(moveCount) * ln(sp->depth / 2) / 3.0;
if (red >= 1.0)
{
ss[sp->ply].reduction = Depth(int(floor(red * int(OnePly))));
@@ -2013,7 +2013,7 @@ namespace {
&& !move_is_castle(move)
&& !move_is_killer(move, ss[sp->ply]))
{
- double red = ln(moveCount) * ln(sp->depth / 2) / 3.0;
+ double red = 0.5 + ln(moveCount) * ln(sp->depth / 2) / 6.0;
if (red >= 1.0)
{
ss[sp->ply].reduction = Depth(int(floor(red * int(OnePly))));

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