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Logaritmic futility margins

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-11-19 15:58:22 +01:00
parent b599da01fa
commit c52da3b806
3 changed files with 41 additions and 2 deletions
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src/search.cpp
+17 -2
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@@ -1417,10 +1417,25 @@ namespace {
{
//std::cout << std::endl;
//for (int d = 2; d < 14; d++)
// std::cout << d << ", " << 300 + 2*(1 << (3*d/4)) << std::endl;
// std::cout << d << ", " << 64*(1+bitScanReverse32(d*d)) << std::endl;
//std::cout << std::endl;
/*
64*(1+bitScanReverse32(d*d))
2 -> 256 - 256
3 -> 288 - 320
4 -> 512 - 384
5 -> 544 - 384
6 -> 592 - 448
7 -> 624 - 448
8 -> 672 - 512
9 -> 704 - 512
10 -> 832 - 512
11 -> 864 - 512
12 -> 928 - 576
13 -> 960 - 576
300 + 2*(1 << (3*d/4))
2 -> 256 - 304
@@ -1458,7 +1473,7 @@ namespace {
{
if (futilityValue == VALUE_NONE)
futilityValue = evaluate(pos, ei, threadID)
+ (300 + 2 * (1 << (3 * int(depth) /4)))
+ 64*(1+bitScanReverse32(int(depth) * int(depth)))
+ 4*IncrementalFutilityMargin;
futilityValueScaled = futilityValue - moveCount * IncrementalFutilityMargin;