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Increase risk of blunders at low skill levels

Browse source 
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