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Safer razoring formula

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Add also the possibility to razor at ply one.
It is disable dby default but it seems stronger
against Stockfish itself. It is still not clear if
is stronger against other engines. By now leave
disabled.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2008-12-28 12:55:33 +01:00
parent aedc6c6f1f
commit e4fd9a2df7
2 changed files with 7 additions and 4 deletions
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9
src/search.cpp
View File

@@ -169,6 +169,7 @@ namespace {
Value(0x2A0), Value(0x340), Value(0x3A0) };
// Razoring
const bool RazorAtDepthOne = false;
Depth RazorDepth = 4*OnePly;
Value RazorMargin = Value(0x300);
@@ -416,7 +417,7 @@ void think(const Position &pos, bool infinite, bool ponder, int side_to_move,
UseFutilityPruning = get_option_value_bool("Futility Pruning (Main Search)");
FutilityMarginQS = value_from_centipawns(get_option_value_int("Futility Margin (Quiescence Search)"));
int fmScale = get_option_value_int("Futility Margin (Main Serach)");
int fmScale = get_option_value_int("Futility Margin Scale Factor (Main Search)");
for (int i = 0; i < 6; i++)
FutilityMargins[i] = (FutilityMargins[i] * fmScale) / 100;
@@ -1241,12 +1242,14 @@ namespace {
else if ( !value_is_mate(beta)
&& approximateEval < beta - RazorMargin
&& depth < RazorDepth
&& depth > OnePly
&& (RazorAtDepthOne || depth > OnePly)
&& ttMove == MOVE_NONE
&& !pos.has_pawn_on_7th(pos.side_to_move()))
{
Value v = qsearch(pos, ss, beta-1, beta, Depth(0), ply, threadID);
if (v < beta - RazorMargin / 2 - int(depth - OnePly) * RazorMargin / 8)
if ( (v < beta - RazorMargin - RazorMargin / 4)
|| (depth <= 2*OnePly && v < beta - RazorMargin)
|| (depth <= OnePly && v < beta - RazorMargin / 2))
return v;
}

2
src/ucioption.cpp
View File

@@ -124,7 +124,7 @@ namespace {
o.push_back(Option("Futility Pruning (Main Search)", true));
o.push_back(Option("Futility Pruning (Quiescence Search)", true));
o.push_back(Option("Futility Margin (Quiescence Search)", 50, 0, 1000));
o.push_back(Option("Futility Margin (Main Serach)", 100, 0, 1000));
o.push_back(Option("Futility Margin Scale Factor (Main Search)", 100, 0, 1000));
o.push_back(Option("Maximum Razoring Depth", 3, 0, 4));
o.push_back(Option("Razoring Margin", 300, 150, 600));
o.push_back(Option("LSN filtering", true));