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Increase risk of blunders at low skill levels

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According to Heinz's tests current setup is in fact too
strong for weak players. This seems the best according
to his tests.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-04-19 09:29:28 +02:00
parent 67b0d0b1cc
commit 2e6839c9a0
1 changed files with 3 additions and 8 deletions
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11
src/search.cpp
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@@ -596,7 +596,7 @@ namespace {
SearchStack ss[PLY_MAX_PLUS_2];
Value bestValues[PLY_MAX_PLUS_2];
int bestMoveChanges[PLY_MAX_PLUS_2];
int depth, aspirationDelta, skillSamplingDepth;
int depth, aspirationDelta;
Value value, alpha, beta;
Move bestMove, easyMove, skillBest, skillPonder;
@@ -605,7 +605,7 @@ namespace {
TT.new_search();
H.clear();
*ponderMove = bestMove = easyMove = skillBest = skillPonder = MOVE_NONE;
depth = aspirationDelta = skillSamplingDepth = 0;
depth = aspirationDelta = 0;
alpha = -VALUE_INFINITE, beta = VALUE_INFINITE;
ss->currentMove = MOVE_NULL; // Hack to skip update_gains()
@@ -622,11 +622,6 @@ namespace {
return MOVE_NONE;
}
// Choose a random sampling depth according to SkillLevel so that at low
// skills there is an higher risk to pick up a blunder.
if (SkillLevelEnabled)
skillSamplingDepth = 4 + SkillLevel + (RK.rand<unsigned>() % 4);
// Iterative deepening loop
while (++depth <= PLY_MAX && (!MaxDepth || depth <= MaxDepth) && !StopRequest)
{
@@ -690,7 +685,7 @@ namespace {
bestMoveChanges[depth] = Rml.bestMoveChanges;
// Do we need to pick now the best and the ponder moves ?
if (SkillLevelEnabled && depth == skillSamplingDepth)
if (SkillLevelEnabled && depth == 1 + SkillLevel)
do_skill_level(&skillBest, &skillPonder);
// Send PV line to GUI and to log file