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Almost passed tuning attempts

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Collect and give a second try to some almost passed tuning attempts and
one-line tweaks from the last month.

Passed STC

LLR: 3.07 (-2.94,2.94) [0.00,4.00]
Total: 15124 W: 2974 L: 2756 D: 9394

And LTC

LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 21577 W: 3507 L: 3289 D: 14781

Bench: 8855226

Resolves #464
This commit is contained in:
Stefano80
2015-10-20 19:46:06 -07:00
committed by Gary Linscott
parent ecc5ff6693
commit 328d314f2f
4 changed files with 36 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
+7 -7
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@@ -64,7 +64,7 @@ namespace {
enum NodeType { Root, PV, NonPV };
// Razoring and futility margin based on depth
Value razor_margin(Depth d) { return Value(512 + 32 * d); }
int razor_margin[4] = {483, 570, 603, 554};
Value futility_margin(Depth d) { return Value(200 * d); }
// Futility and reductions lookup tables, initialized at startup
@@ -149,7 +149,7 @@ namespace {
void Search::init() {
const double K[][2] = {{ 0.83, 2.25 }, { 0.50, 3.00 }};
const double K[][2] = {{ 0.799, 2.281 }, { 0.484, 3.023 }};
for (int pv = 0; pv <= 1; ++pv)
for (int imp = 0; imp <= 1; ++imp)
@@ -393,7 +393,7 @@ void Thread::search(bool isMainThread) {
// Reset aspiration window starting size
if (depth >= 5 * ONE_PLY)
{
delta = Value(16);
delta = Value(18);
alpha = std::max(rootMoves[PVIdx].previousScore - delta,-VALUE_INFINITE);
beta = std::min(rootMoves[PVIdx].previousScore + delta, VALUE_INFINITE);
}
@@ -453,7 +453,7 @@ void Thread::search(bool isMainThread) {
else
break;
delta += delta / 2;
delta += delta / 4 + 5;
assert(alpha >= -VALUE_INFINITE && beta <= VALUE_INFINITE);
}
@@ -690,14 +690,14 @@ namespace {
// Step 6. Razoring (skipped when in check)
if ( !PvNode
&& depth < 4 * ONE_PLY
&& eval + razor_margin(depth) <= alpha
&& eval + razor_margin[depth] <= alpha
&& ttMove == MOVE_NONE)
{
if ( depth <= ONE_PLY
&& eval + razor_margin(3 * ONE_PLY) <= alpha)
&& eval + razor_margin[3 * ONE_PLY] <= alpha)
return qsearch<NonPV, false>(pos, ss, alpha, beta, DEPTH_ZERO);
Value ralpha = alpha - razor_margin(depth);
Value ralpha = alpha - razor_margin[depth];
Value v = qsearch<NonPV, false>(pos, ss, ralpha, ralpha+1, DEPTH_ZERO);
if (v <= ralpha)
return v;