/// MaterialTable::material_info() takes a position object as input,
/// computes or looks up a MaterialInfo object, and returns a pointer to it.
/// If the material configuration is not already present in the table, it
/// is stored there, so we don't have to recompute everything when the
/// same material configuration occurs again.
internal void probe(Position pos, out MaterialEntry e)
{
var key = pos.material_key();
e = this.entries[((uint)key) & Constants.MaterialTableMask];
// If mi->key matches the position's material hash key, it means that we
// have analysed this material configuration before, and we can simply
// return the information we found the last time instead of recomputing it.
if (e.key == key)
{
return;
}
// Initialize MaterialInfo entry
var npm = pos.non_pawn_material(ColorC.WHITE) + pos.non_pawn_material(ColorC.BLACK);
e.value = 0;
e.scalingFunctionWHITE = null;
e.scalingFunctionBLACK = null;
e.spaceWeight = 0;
e.key = key;
e.factorWHITE = e.factorBLACK = ScaleFactorC.SCALE_FACTOR_NORMAL;
e.gamePhase = npm >= MidgameLimit
? PhaseC.PHASE_MIDGAME
: npm <= EndgameLimit
? PhaseC.PHASE_ENDGAME
: (((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit));
// Let's look if we have a specialized evaluation function for this
// particular material configuration. First we look for a fixed
// configuration one, then a generic one if previous search failed.
if ((e.evaluationFunction = Endgame.probeValue(key, out e.evaluationFunctionColor)) != null)
{
return;
}
if (is_KXK(ColorC.WHITE, pos))
{
e.evaluationFunction = Endgame.Endgame_KXK;
e.evaluationFunctionColor = ColorC.WHITE;
return;
}
if (is_KXK(ColorC.BLACK, pos))
{
e.evaluationFunction = Endgame.Endgame_KXK;
e.evaluationFunctionColor = ColorC.BLACK;
return;
}
if ((pos.pieces_PT(PieceTypeC.PAWN) == 0) && (pos.pieces_PT(PieceTypeC.ROOK) == 0)
&& (pos.pieces_PT(PieceTypeC.QUEEN) == 0))
{
// Minor piece endgame with at least one minor piece per side and
// no pawns. Note that the case KmmK is already handled by KXK.
Debug.Assert(
(pos.pieces_PTC(PieceTypeC.KNIGHT, ColorC.WHITE) | pos.pieces_PTC(PieceTypeC.BISHOP, ColorC.WHITE))
!= 0);
Debug.Assert(
(pos.pieces_PTC(PieceTypeC.KNIGHT, ColorC.BLACK) | pos.pieces_PTC(PieceTypeC.BISHOP, ColorC.BLACK))
!= 0);
if (pos.piece_count(ColorC.WHITE, PieceTypeC.BISHOP) + pos.piece_count(ColorC.WHITE, PieceTypeC.KNIGHT)
<= 2
&& pos.piece_count(ColorC.BLACK, PieceTypeC.BISHOP)
+ pos.piece_count(ColorC.BLACK, PieceTypeC.KNIGHT) <= 2)
{
e.evaluationFunction = Endgame.Endgame_KmmKm;
e.evaluationFunctionColor = pos.sideToMove;
return;
}
}
// OK, we didn't find any special evaluation function for the current
// material configuration. Is there a suitable scaling function?
//
// We face problems when there are several conflicting applicable
// scaling functions and we need to decide which one to use.
EndgameScaleFactor sf;
int c;
if ((sf = Endgame.probeScaleFactor(key, out c)) != null)
{
if (c == ColorC.WHITE)
{
e.scalingFunctionWHITE = sf;
}
else
{
e.scalingFunctionBLACK = sf;
}
return;
}
// Generic scaling functions that refer to more then one material
// distribution. Should be probed after the specialized ones.
// Note that these ones don't return after setting the function.
if (is_KBPsKs(ColorC.WHITE, pos))
{
e.scalingFunctionWHITE = Endgame.Endgame_KBPsK;
}
if (is_KBPsKs(ColorC.BLACK, pos))
{
e.scalingFunctionBLACK = Endgame.Endgame_KBPsK;
}
if (is_KQKRPs(ColorC.WHITE, pos))
{
e.scalingFunctionWHITE = Endgame.Endgame_KQKRPs;
}
else if (is_KQKRPs(ColorC.BLACK, pos))
{
e.scalingFunctionBLACK = Endgame.Endgame_KQKRPs;
}
var npm_w = pos.non_pawn_material(ColorC.WHITE);
var npm_b = pos.non_pawn_material(ColorC.BLACK);
if (npm_w + npm_b == ValueC.VALUE_ZERO)
{
if (pos.piece_count(ColorC.BLACK, PieceTypeC.PAWN) == 0)
{
Debug.Assert(pos.piece_count(ColorC.WHITE, PieceTypeC.PAWN) >= 2);
e.scalingFunctionWHITE = Endgame.Endgame_KPsK;
}
else if (pos.piece_count(ColorC.WHITE, PieceTypeC.PAWN) == 0)
{
Debug.Assert(pos.piece_count(ColorC.BLACK, PieceTypeC.PAWN) >= 2);
e.scalingFunctionBLACK = Endgame.Endgame_KPsK;
}
else if (pos.piece_count(ColorC.WHITE, PieceTypeC.PAWN) == 1
&& pos.piece_count(ColorC.BLACK, PieceTypeC.PAWN) == 1)
{
// This is a special case because we set scaling functions
// for both colors instead of only one.
e.scalingFunctionWHITE = Endgame.Endgame_KPKP;
e.scalingFunctionBLACK = Endgame.Endgame_KPKP;
}
}
// No pawns makes it difficult to win, even with a material advantage
if (pos.piece_count(ColorC.WHITE, PieceTypeC.PAWN) == 0 && npm_w - npm_b <= Constants.BishopValueMidgame)
{
e.factorWHITE =
(byte)
(npm_w == npm_b || npm_w < Constants.RookValueMidgame
? 0
: NoPawnsSF[Math.Min(pos.piece_count(ColorC.WHITE, PieceTypeC.BISHOP), 2)]);
}
if (pos.piece_count(ColorC.BLACK, PieceTypeC.PAWN) == 0 && npm_b - npm_w <= Constants.BishopValueMidgame)
{
e.factorBLACK =
(byte)
(npm_w == npm_b || npm_b < Constants.RookValueMidgame
? 0
: NoPawnsSF[Math.Min(pos.piece_count(ColorC.BLACK, PieceTypeC.BISHOP), 2)]);
}
// Compute the space weight
if (npm_w + npm_b
>= 2 * Constants.QueenValueMidgame + 4 * Constants.RookValueMidgame + 2 * Constants.KnightValueMidgame)
{
var minorPieceCount = pos.piece_count(ColorC.WHITE, PieceTypeC.KNIGHT)
+ pos.piece_count(ColorC.WHITE, PieceTypeC.BISHOP)
+ pos.piece_count(ColorC.BLACK, PieceTypeC.KNIGHT)
+ pos.piece_count(ColorC.BLACK, PieceTypeC.BISHOP);
e.spaceWeight = minorPieceCount * minorPieceCount;
}
// Evaluate the material imbalance. We use PIECE_TYPE_NONE as a place holder
// for the bishop pair "extended piece", this allow us to be more flexible
// in defining bishop pair bonuses.
this.pieceCount[0][0] = pos.piece_count(ColorC.WHITE, PieceTypeC.BISHOP) > 1 ? 1 : 0;
this.pieceCount[0][1] = pos.piece_count(ColorC.WHITE, PieceTypeC.PAWN);
this.pieceCount[0][2] = pos.piece_count(ColorC.WHITE, PieceTypeC.KNIGHT);
this.pieceCount[0][3] = pos.piece_count(ColorC.WHITE, PieceTypeC.BISHOP);
this.pieceCount[0][4] = pos.piece_count(ColorC.WHITE, PieceTypeC.ROOK);
this.pieceCount[0][5] = pos.piece_count(ColorC.WHITE, PieceTypeC.QUEEN);
this.pieceCount[1][0] = pos.piece_count(ColorC.BLACK, PieceTypeC.BISHOP) > 1 ? 1 : 0;
this.pieceCount[1][1] = pos.piece_count(ColorC.BLACK, PieceTypeC.PAWN);
this.pieceCount[1][2] = pos.piece_count(ColorC.BLACK, PieceTypeC.KNIGHT);
this.pieceCount[1][3] = pos.piece_count(ColorC.BLACK, PieceTypeC.BISHOP);
this.pieceCount[1][4] = pos.piece_count(ColorC.BLACK, PieceTypeC.ROOK);
this.pieceCount[1][5] = pos.piece_count(ColorC.BLACK, PieceTypeC.QUEEN);
e.value = (short)((this.imbalance(ColorC.WHITE) - this.imbalance(ColorC.BLACK)) / 16);
}
/// Wait for a command from the user, parse this text string as an UCI command,
/// and call the appropriate functions. Also intercepts EOF from stdin to ensure
/// that we exit gracefully if the GUI dies unexpectedly. In addition to the UCI
/// commands, the function also supports a few debug commands.
internal static void uci_loop(string args)
{
for (int i = 0; i < 102; i++)
{
StateRingBuf[i] = new StateInfo();
}
Position pos = new Position(StartFEN, false, Threads.main_thread()); // The root position
string cmd, token = string.Empty;
while (token != "quit")
{
if (args.Length > 0)
{
cmd = args;
}
else if (String.IsNullOrEmpty(cmd = Plug.ReadLine())) // Block here waiting for input
{
cmd = "quit";
}
Stack<string> stack = Utils.CreateStack(cmd);
token = stack.Pop();
if (token == "quit" || token == "stop")
{
Search.SignalsStop = true;
Threads.wait_for_search_finished(); // Cannot quit while threads are running
}
else if (token == "ponderhit")
{
// The opponent has played the expected move. GUI sends "ponderhit" if
// we were told to ponder on the same move the opponent has played. We
// should continue searching but switching from pondering to normal search.
Search.Limits.ponder = false;
if (Search.SignalsStopOnPonderhit)
{
Search.SignalsStop = true;
Threads.main_thread().wake_up(); // Could be sleeping
}
}
else if (token == "go")
{
go(pos, stack);
}
else if (token == "ucinewgame")
{ /* Avoid returning "Unknown command" */ }
else if (token == "isready")
{
Plug.Write("readyok");
Plug.Write(Constants.endl);
}
else if (token == "position")
{
set_position(pos, stack);
}
else if (token == "setoption")
{
set_option(stack);
}
else if (token == "validmoves")
{
Search.validmoves(pos, stack);
}
else if (token == "d")
{
pos.print(0);
}
else if (token == "flip")
{
pos.flip();
}
else if (token == "eval")
{
Plug.Write(Evaluate.trace(pos));
Plug.Write(Constants.endl);
}
else if (token == "bench")
{
Benchmark.benchmark(pos, stack);
}
else if (token == "key")
{
Plug.Write("key: ");
Plug.Write(String.Format("{0:X}", pos.key()));
Plug.Write("\nmaterial key: ");
Plug.Write(pos.material_key().ToString());
Plug.Write("\npawn key: ");
Plug.Write(pos.pawn_key().ToString());
Plug.Write(Constants.endl);
}
else if (token == "uci")
{
Plug.Write("id name "); Plug.Write(Utils.engine_info(true));
Plug.Write("\n"); Plug.Write(OptionMap.Instance.ToString());
Plug.Write("\nuciok"); Plug.Write(Constants.endl);
}
else if (token == "perft")
{
token = stack.Pop(); // Read depth
Stack<string> ss = Utils.CreateStack(
string.Format("{0} {1} {2} current perft", OptionMap.Instance["Hash"].v, OptionMap.Instance["Threads"].v, token)
);
Benchmark.benchmark(pos, ss);
}
else
{
Plug.Write("Unknown command: ");
Plug.Write(cmd);
Plug.Write(Constants.endl);
}
if (args.Length > 0) // Command line arguments have one-shot behaviour
{
Threads.wait_for_search_finished();
break;
}
}
}
/// Wait for a command from the user, parse this text string as an UCI command,
/// and call the appropriate functions. Also intercepts EOF from stdin to ensure
/// that we exit gracefully if the GUI dies unexpectedly. In addition to the UCI
/// commands, the function also supports a few debug commands.
internal static void loop(string args)
{
for (var i = 0; i < 102; i++)
{
StateRingBuf[i] = new StateInfo();
}
var pos = new Position(StartFEN, false, Threads.main_thread()); // The root position
string cmd, token = string.Empty;
while (token != "quit")
{
if (args.Length > 0)
{
cmd = args;
}
else if (string.IsNullOrEmpty(cmd = Plug.ReadLine())) // Block here waiting for input
{
cmd = "quit";
}
var stack = Utils.CreateStack(cmd);
token = stack.Pop();
if (token == "quit" || token == "stop" || token == "ponderhit")
{
// GUI sends 'ponderhit' to tell us to ponder on the same move the
// opponent has played. In case Signals.stopOnPonderhit is set we are
// waiting for 'ponderhit' to stop the search (for instance because we
// already ran out of time), otherwise we should continue searching but
// switching from pondering to normal search.
if (token != "ponderhit" || Search.SignalsStopOnPonderhit)
{
Search.SignalsStop = true;
Threads.main_thread().notify_one(); // Could be sleeping
}
else
{
Search.Limits.ponder = false;
}
}
else if (token == "go")
{
go(pos, stack);
}
else if (token == "ucinewgame")
{
TT.clear();
}
else if (token == "isready")
{
Plug.Write("readyok");
Plug.Write(Constants.endl);
}
else if (token == "position")
{
set_position(pos, stack);
}
else if (token == "setoption")
{
set_option(stack);
}
else if (token == "validmoves")
{
Search.validmoves(pos, stack);
}
else if (token == "d")
{
pos.print(0);
}
else if (token == "flip")
{
pos.flip();
}
else if (token == "eval")
{
Plug.Write(Evaluate.trace(pos));
Plug.Write(Constants.endl);
}
else if (token == "bench")
{
Benchmark.benchmark(pos, stack);
}
else if (token == "key")
{
Plug.Write("key: ");
Plug.Write(string.Format("{0:X}", pos.key()));
Plug.Write("\nmaterial key: ");
Plug.Write(pos.material_key().ToString());
Plug.Write("\npawn key: ");
Plug.Write(pos.pawn_key().ToString());
Plug.Write(Constants.endl);
}
else if (token == "uci")
{
Plug.Write("id name ");
Plug.Write(Utils.engine_info(true));
Plug.Write("\n");
Plug.Write(OptionMap.Instance.ToString());
Plug.Write("\nuciok");
Plug.Write(Constants.endl);
}
else if (token == "perft")
{
token = stack.Pop(); // Read depth
var ss =
Utils.CreateStack(
string.Format(
"{0} {1} {2} current perft",
OptionMap.Instance["Hash"].v,
OptionMap.Instance["Threads"].v,
token));
Benchmark.benchmark(pos, ss);
}
else
{
Plug.Write("Unknown command: ");
Plug.Write(cmd);
Plug.Write(Constants.endl);
}
if (args.Length > 0) // Command line arguments have one-shot behaviour
{
Threads.wait_for_think_finished();
break;
}
}
}
