Depth RazorDepth = 4*OnePly;
Value RazorMargin = Value(0x300);
+ // Last seconds noise filtering (LSN)
+ bool UseLSNFiltering = false;
+ bool looseOnTime = false;
+ int LSNTime = 4 * 1000; // In milliseconds
+ Value LSNValue = Value(0x200);
+
// Extensions. Array index 0 is used at non-PV nodes, index 1 at PV nodes.
Depth CheckExtension[2] = {OnePly, OnePly};
Depth SingleReplyExtension[2] = {OnePly / 2, OnePly / 2};
/// Functions
- void id_loop(const Position &pos, Move searchMoves[]);
+ Value id_loop(const Position &pos, Move searchMoves[]);
Value root_search(Position &pos, SearchStack ss[], RootMoveList &rml);
Value search_pv(Position &pos, SearchStack ss[], Value alpha, Value beta,
Depth depth, int ply, int threadID);
RazorDepth = (get_option_value_int("Maximum Razoring Depth") + 1) * OnePly;
RazorMargin = value_from_centipawns(get_option_value_int("Razoring Margin"));
+ UseLSNFiltering = get_option_value_bool("LSN filtering");
+ LSNTime = get_option_value_int("LSN Time Margin (sec)") * 1000;
+ 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:
- id_loop(pos, searchMoves);
+ if (!looseOnTime)
+ {
+ Value v = id_loop(pos, searchMoves);
+ looseOnTime = ( UseLSNFiltering
+ && myTime < LSNTime
+ && myIncrement == 0
+ && v < -LSNValue);
+ }
+ else
+ {
+ looseOnTime = false; // reset for next match
+ while (SearchStartTime + myTime + 1000 > get_system_time())
+ ; // wait here
+ id_loop(pos, searchMoves); // to fail gracefully
+ }
if(UseLogFile)
LogFile.close();
// been consumed, the user stops the search, or the maximum search depth is
// reached.
- void id_loop(const Position &pos, Move searchMoves[]) {
+ Value id_loop(const Position &pos, Move searchMoves[]) {
Position p(pos);
SearchStack ss[PLY_MAX_PLUS_2];
LogFile << "Ponder move: " << move_to_san(p, ss[0].pv[1]) << '\n';
LogFile << std::endl;
}
+ return rml.get_move_score(0);
}
}
}
// Null move search not allowed, try razoring
- else if (depth < RazorDepth && approximateEval < beta - RazorMargin)
+ else if ( (approximateEval < beta - RazorMargin && depth < RazorDepth)
+ ||(approximateEval < beta - PawnValueMidgame && depth <= OnePly))
{
Value v = qsearch(pos, ss, beta-1, beta, Depth(0), ply, threadID);
if (v < beta)