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CuckooChess: Made strength setting between 0% and 10% even weaker. 0% now plays random legal moves, and 10% corresponds to the old 0% setting.

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Peter Osterlund 2012-01-07 22:06:57 +00:00
parent 6b04258f95
commit ae985c5ed5
1 changed files with 26 additions and 5 deletions
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25
CuckooChessEngine/src/chess/Search.java
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@ -188,11 +188,32 @@ public class Search {
totalNodes = 0;
if (scMovesIn.size <= 0)
return null; // No moves to search
MoveInfo[] scMoves = new MoveInfo[scMovesIn.size];
MoveInfo[] scMoves;
{
// If strength is < 10%, only include a subset of the root moves.
// At least one move is always included though.
boolean[] includedMoves = new boolean[scMovesIn.size];
long rndL = pos.zobristHash() ^ randomSeed;
includedMoves[(int)(Math.abs(rndL) % scMovesIn.size)] = true;
int nIncludedMoves = 1;
double pIncl = (strength < 100) ? strength * strength * 1e-4 : 1.0;
for (int mi = 0; mi < scMovesIn.size; mi++) {
rndL = 6364136223846793005L * rndL + 1442695040888963407L;
double rnd = ((rndL & 0x7fffffffffffffffL) % 1000000000) / 1e9;
if (!includedMoves[mi] && (rnd < pIncl)) {
includedMoves[mi] = true;
nIncludedMoves++;
}
}
scMoves = new MoveInfo[nIncludedMoves];
for (int mi = 0, len = 0; mi < scMovesIn.size; mi++) {
if (includedMoves[mi]) {
Move m = scMovesIn.m[mi];
scMoves[len++] = new MoveInfo(m, 0);
}
}
}
maxNodes = initialMaxNodes;
nodesToGo = 0;
Position origPos = new Position(pos);
@ -873,7 +894,7 @@ public class Search {
double rnd = ((rndL & 0x7fffffffffffffffL) % 1000000000) / 1e9;
double s = strength * 1e-3;
double offs = 4 - 15 * s;
double offs = (17 - 50 * s) / 3;
double effPly = ply * Evaluate.interpolate(pos.wMtrl + pos.bMtrl, 0, 30, Evaluate.qV * 4, 100) * 1e-2;
double t = effPly + offs;
double p = 1/(1+Math.exp(t)); // Probability to "see" move