kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-04-30 08:43:09 +00:00
Code Issues Releases Wiki Activity

Don't overwrite exsisting TT with null search value

Browse source 
Real search is considered of higher quality then null
search one.

This allows to fix the zugzwang issue with a minimal
impact on ELO.

Zugzwang verified on position:

8/7P/8/8/K2b4/p7/1k6/1B6 b - -

After 999 games at 1+0 on my QUAD
Mod vs Orig(94bb196) +168 =657 -174  -2 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-04-14 06:13:24 +01:00
parent abae3c5678
commit ec0a650dff
1 changed files with 3 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
src/search.cpp
View file

@ -1395,7 +1395,9 @@ namespace {
{ {
assert(value_to_tt(nullValue, ply) == nullValue); assert(value_to_tt(nullValue, ply) == nullValue);
TT.store(posKey, nullValue, VALUE_TYPE_NS_LO, depth, MOVE_NONE); if (!tte)
TT.store(posKey, nullValue, VALUE_TYPE_NS_LO, depth, MOVE_NONE);
return nullValue; return nullValue;
} }
} else { } else {