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Code Issues Releases Wiki Activity

Fix some comments in early stop detection

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No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-04-23 15:42:23 +01:00
parent 8b2adcf99e
commit fe213d30fa
1 changed files with 21 additions and 25 deletions
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44
src/search.cpp
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@ -610,8 +610,8 @@ namespace {
return MOVE_NONE; return MOVE_NONE;
} }
// Iterative deepening loop // Iterative deepening loop until requested to stop or target depth reached
while (++depth <= PLY_MAX && (!Limits.maxDepth || depth <= Limits.maxDepth) && !StopRequest) while (!StopRequest && ++depth <= PLY_MAX && (!Limits.maxDepth || depth <= Limits.maxDepth))
{ {
Rml.bestMoveChanges = 0; Rml.bestMoveChanges = 0;
cout << set960(pos.is_chess960()) << "info depth " << depth << endl; cout << set960(pos.is_chess960()) << "info depth " << depth << endl;
@ -695,20 +695,18 @@ namespace {
else if (bestMove != easyMove) else if (bestMove != easyMove)
easyMove = MOVE_NONE; easyMove = MOVE_NONE;
if (Limits.useTimeManagement() && !StopRequest) // Check for some early stop condition
if (!StopRequest && Limits.useTimeManagement())
{ {
// Time to stop?
bool noMoreTime = false;
// Stop search early when the last two iterations returned a mate score // Stop search early when the last two iterations returned a mate score
if ( depth >= 5 if ( depth >= 5
&& abs(bestValues[depth]) >= abs(VALUE_MATE) - 100 && abs(bestValues[depth]) >= VALUE_MATE_IN_PLY_MAX
&& abs(bestValues[depth - 1]) >= abs(VALUE_MATE) - 100) && abs(bestValues[depth - 1]) >= VALUE_MATE_IN_PLY_MAX)
noMoreTime = true; StopRequest = true;
// Stop search early if one move seems to be much better than the // Stop search early if one move seems to be much better than the
// others or if there is only a single legal move. In this latter // others or if there is only a single legal move. Also in the latter
// case we search up to Iteration 8 anyway to get a proper score. // case we search up to some depth anyway to get a proper score.
if ( depth >= 7 if ( depth >= 7
&& easyMove == bestMove && easyMove == bestMove
&& ( Rml.size() == 1 && ( Rml.size() == 1
@ -716,29 +714,27 @@ namespace {
&& current_search_time() > TimeMgr.available_time() / 16) && current_search_time() > TimeMgr.available_time() / 16)
||( Rml[0].nodes > (pos.nodes_searched() * 98) / 100 ||( Rml[0].nodes > (pos.nodes_searched() * 98) / 100
&& current_search_time() > TimeMgr.available_time() / 32))) && current_search_time() > TimeMgr.available_time() / 32)))
noMoreTime = true; StopRequest = true;
// Add some extra time if the best move has changed during the last two iterations // Take in account some extra time if the best move has changed
if (depth > 4 && depth < 50) if (depth > 4 && depth < 50)
TimeMgr.pv_instability(bestMoveChanges[depth], bestMoveChanges[depth-1]); TimeMgr.pv_instability(bestMoveChanges[depth], bestMoveChanges[depth - 1]);
// Stop search if most of MaxSearchTime is consumed at the end of the // Stop search if most of available time is already consumed. We probably don't
// iteration. We probably don't have enough time to search the first // have enough time to search the first move at the next iteration anyway.
// move at the next iteration anyway. if (current_search_time() > (TimeMgr.available_time() * 62) / 100)
if (current_search_time() > (TimeMgr.available_time() * 80) / 128) StopRequest = true;
noMoreTime = true;
if (noMoreTime) // If we are allowed to ponder do not stop the search now but keep pondering
if (StopRequest && Limits.ponder)
{ {
if (Limits.ponder) StopRequest = false;
StopOnPonderhit = true; StopOnPonderhit = true;
else
break;
} }
} }
} }
// When using skills fake best and ponder moves with the sub-optimal ones // When using skills overwrite best and ponder moves with the sub-optimal ones
if (SkillLevelEnabled) if (SkillLevelEnabled)
{ {
if (skillBest == MOVE_NONE) // Still unassigned ? if (skillBest == MOVE_NONE) // Still unassigned ?