// Depth limit for use of dynamic threat detection
Depth ThreatDepth; // heavy SMP read access
+ // Last seconds noise filtering (LSN)
+ const bool UseLSNFiltering = true;
+ const int LSNTime = 4000; // In milliseconds
+ const Value LSNValue = value_from_centipawns(200);
+ bool loseOnTime = false;
+
// Extensions. Array index 0 is used at non-PV nodes, index 1 at PV nodes.
// There is heavy SMP read access on these arrays
Depth CheckExtension[2], SingleReplyExtension[2], PawnPushTo7thExtension[2];
// Read UCI option values
TT.set_size(get_option_value_int("Hash"));
if (button_was_pressed("Clear Hash"))
+ {
TT.clear();
+ loseOnTime = false; // reset at the beginning of a new game
+ }
bool PonderingEnabled = get_option_value_bool("Ponder");
MultiPV = get_option_value_int("MultiPV");
if (UseLogFile)
LogFile.open(get_option_value_string("Search Log Filename").c_str(), std::ios::out | std::ios::app);
- bool UseLSNFiltering = get_option_value_bool("LSN filtering");
- int LSNTime = get_option_value_int("LSN Time Margin (sec)") * 1000;
- Value LSNValue = value_from_centipawns(get_option_value_int("LSN Value Margin"));
-
MinimumSplitDepth = get_option_value_int("Minimum Split Depth") * OnePly;
MaxThreadsPerSplitPoint = get_option_value_int("Maximum Number of Threads per Split Point");
// We're ready to start thinking. Call the iterative deepening loop function
- static bool looseOnTime = false;
-
+ //
// FIXME we really need to cleanup all this LSN ugliness
- if (!looseOnTime)
+ if (!loseOnTime)
{
Value v = id_loop(pos, searchMoves);
- looseOnTime = ( UseLSNFiltering
+ loseOnTime = ( UseLSNFiltering
&& myTime < LSNTime
&& myIncrement == 0
&& v < -LSNValue);
}
else
{
- looseOnTime = false; // reset for next match
+ loseOnTime = false; // reset for next match
while (SearchStartTime + myTime + 1000 > get_system_time())
; // wait here
id_loop(pos, searchMoves); // to fail gracefully
{
// Try to reduce non-pv search depth by one ply if move seems not problematic,
// if the move fails high will be re-searched at full depth.
- if ( depth >= 2*OnePly
+ if ( depth >= 3*OnePly
&& moveCount >= LMRPVMoves
&& !dangerous
&& !moveIsCapture
if (value_is_mate(nullValue))
{
+ if (nullValue == value_mated_in(ply + 2))
+ mateThreat = true;
+
/* Do not return unproven mates */
}
else if (nullValue >= beta)
// move which was reduced. If a connection is found, return a fail
// low score (which will cause the reduced move to fail high in the
// parent node, which will trigger a re-search with full depth).
- if (nullValue == value_mated_in(ply + 2))
- mateThreat = true;
-
ss[ply].threatMove = ss[ply + 1].currentMove;
if ( depth < ThreatDepth
&& ss[ply - 1].reduction
// Try to reduce non-pv search depth by one ply if move seems not problematic,
// if the move fails high will be re-searched at full depth.
- if ( depth >= 2*OnePly
+ if ( depth >= 3*OnePly
&& moveCount >= LMRNonPVMoves
&& !dangerous
&& !moveIsCapture
else if (tte && tte->type() == VALUE_TYPE_EVAL)
{
// Use the cached evaluation score if possible
- assert(tte->value() == evaluate(pos, ei, threadID));
assert(ei.futilityMargin == Value(0));
staticValue = tte->value();