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Retire LSN machinery

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Now that we use cutechess-cli we can set the auto-resign
parameter that makes LSN less effective.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-07-14 14:21:28 +02:00
parent 8547798345
commit 605b3aedd5
1 changed files with 1 additions and 39 deletions
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40
src/search.cpp
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@ -233,12 +233,6 @@ namespace {
// better than the second best move. // better than the second best move.
const Value EasyMoveMargin = Value(0x200); const Value EasyMoveMargin = Value(0x200);
// Last seconds noise filtering (LSN)
const bool UseLSNFiltering = true;
const int LSNTime = 100; // In milliseconds
const Value LSNValue = value_from_centipawns(200);
bool loseOnTime = false;
/// Global variables /// Global variables
@ -448,10 +442,6 @@ bool think(const Position& pos, bool infinite, bool ponder, int side_to_move,
} }
} }
// Reset loseOnTime flag at the beginning of a new game
if (button_was_pressed("New Game"))
loseOnTime = false;
// Read UCI option values // Read UCI option values
TT.set_size(get_option_value_int("Hash")); TT.set_size(get_option_value_int("Hash"));
if (button_was_pressed("Clear Hash")) if (button_was_pressed("Clear Hash"))
@ -551,36 +541,8 @@ bool think(const Position& pos, bool infinite, bool ponder, int side_to_move,
<< " increment: " << myIncrement << " increment: " << myIncrement
<< " moves to go: " << movesToGo << endl; << " moves to go: " << movesToGo << endl;
// LSN filtering. Used only for developing purposes, disabled by default
if ( UseLSNFiltering
&& loseOnTime)
{
// Step 2. If after last move we decided to lose on time, do it now!
while (SearchStartTime + myTime + 1000 > get_system_time())
/* wait here */;
}
// We're ready to start thinking. Call the iterative deepening loop function // We're ready to start thinking. Call the iterative deepening loop function
Value v = id_loop(pos, searchMoves); id_loop(pos, searchMoves);
if (UseLSNFiltering)
{
// Step 1. If this is sudden death game and our position is hopeless,
// decide to lose on time.
if ( !loseOnTime // If we already lost on time, go to step 3.
&& myTime < LSNTime
&& myIncrement == 0
&& movesToGo == 0
&& v < -LSNValue)
{
loseOnTime = true;
}
else if (loseOnTime)
{
// Step 3. Now after stepping over the time limit, reset flag for next match.
loseOnTime = false;
}
}
if (UseLogFile) if (UseLogFile)
LogFile.close(); LogFile.close();