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Add UCI_Elo support to CuckooChess

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If both "Strength" and "UCI_Elo" is used, "UCI_Elo" tases precedence.

Internally UCI_Elo is converted to a Strength value using a lookup
table that was calculated by playing games against Stockfish 11 using
its UCI_Elo implementation. The time control was 60+0.6 on computers
where Stockfish bench reported about 1.73e6 NPS.
This commit is contained in:
Peter Osterlund 2020-04-13 09:52:14 +02:00
parent 67e03495dc
commit 00c59c0247
1 changed files with 52 additions and 3 deletions
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53
CuckooChess/src/main/java/uci/EngineControl.java
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@ -73,6 +73,8 @@ public class EngineControl {
// Reduced strength variables
private int strength = 1000;
private boolean limitStrength = false; // If set, overrides strength, using eloToStrength table
private int elo = Integer.MAX_VALUE;
private int maxNPS = 0;
private long randomSeed = 0;
@ -227,7 +229,7 @@ public class EngineControl {
sc = new Search(pos, posHashList, posHashListSize, tt, ht);
sc.timeLimit(minTimeLimit, maxTimeLimit);
sc.setListener(new SearchListener(os));
sc.setStrength(strength, randomSeed, maxNPS);
sc.setStrength(getStrength(), randomSeed, maxNPS);
MoveGen.MoveList moves = moveGen.pseudoLegalMoves(pos);
MoveGen.removeIllegal(pos, moves);
if ((searchMoves != null) && (searchMoves.size() > 0))
@ -375,6 +377,8 @@ public class EngineControl {
os.printf("option name UCI_EngineAbout type string default %s by Peter Osterlund, see %s%n",
ComputerPlayer.engineName, "http://hem.bredband.net/petero2b/javachess/index.html");
os.print("option name Strength type spin default 1000 min 0 max 1000\n");
os.print("option name UCI_LimitStrength type check default false\n");
os.print("option name UCI_Elo type spin default 1500 min -625 max 2400\n");
os.print("option name maxNPS type spin default 0 min 0 max 10000000\n");
for (String pName : Parameters.instance().getParamNames()) {
@ -382,7 +386,7 @@ public class EngineControl {
switch (p.type) {
case CHECK: {
CheckParam cp = (CheckParam)p;
os.printf("optionn name %s type check default %s\n",
os.printf("option name %s type check default %s\n",
p.name, cp.defaultValue?"true":"false");
break;
}
@ -426,6 +430,10 @@ public class EngineControl {
analyseMode = Boolean.parseBoolean(optionValue);
} else if (optionName.equals("strength")) {
strength = Integer.parseInt(optionValue);
} else if (optionName.equals("uci_limitstrength")) {
limitStrength = Boolean.parseBoolean(optionValue);
} else if (optionName.equals("uci_elo")) {
elo = Integer.parseInt(optionValue);
} else if (optionName.equals("maxnps")) {
maxNPS = Integer.parseInt(optionValue);
} else {
@ -434,4 +442,45 @@ public class EngineControl {
} catch (NumberFormatException ignore) {
}
}
private static int[][] eloToStrength = {
{ -625, 0 },
{ -572, 10 },
{ -396, 20 },
{ -145, 30 },
{ 204, 45 },
{ 473, 60 },
{ 679, 75 },
{ 891, 100 },
{ 917, 200 },
{ 1055, 300 },
{ 1321, 375 },
{ 1408, 400 },
{ 1694, 500 },
{ 1938, 600 },
{ 2073, 675 },
{ 2182, 750 },
{ 2294, 875 },
{ 2360, 950 },
{ 2410, 1000 },
};
/** Get strength setting, possibly by interpolating in eloToStrength table. */
private int getStrength() {
if (!limitStrength)
return strength;
if (elo <= eloToStrength[0][0])
return eloToStrength[0][1];
int n = eloToStrength.length;
for (int i = 1; i < n; i++) {
if (elo <= eloToStrength[i][0]) {
double a = eloToStrength[i-1][0];
double b = eloToStrength[i ][0];
double fa = eloToStrength[i-1][1];
double fb = eloToStrength[i ][1];
return (int)Math.round(fa + (elo - a) / (b - a) * (fb - fa));
}
}
return eloToStrength[n-1][1];
}
}