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Code Issues Releases Wiki Activity

Fix DTZTable key check

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We currently check onnly first key, while
we shoudl check both, as confirmed by
author on talkchess:

http://www.talkchess.com/forum/viewtopic.php?t=59947&start=30

This bug fix do not change functionality, we simply
find earlier the DTZ entry instead of reload it.
This commit is contained in:
Marco Costalba 2016-05-08 15:01:08 +02:00
parent 8baa476390
commit 8d2eb34944
1 changed files with 3 additions and 3 deletions
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6
src/syzygy/tbprobe.cpp
View file

@ -201,7 +201,7 @@ const uint8_t DTZ_MAGIC[] = { 0xD7, 0x66, 0x0C, 0xA5 };
const int wdl_to_dtz[] = { -1, -101, 0, 101, 1 };
const Value WDL_to_value[] = {
-VALUE_MATE + MAX_PLY + 1,
-VALUE_MATE + MAX_PLY + 1,
VALUE_DRAW - 2,
VALUE_DRAW,
VALUE_DRAW + 2,
@ -1176,14 +1176,14 @@ int probe_dtz_table(const Position& pos, WDLScore wdl, int *success)
// Enforce "Most Recently Used" (MRU) order for DTZ list
for (auto it = DTZTable.begin(); it != DTZTable.end(); ++it)
if (it->key == key) {
if (it->key == key || it->key2 == key) {
// Move to front without deleting the element
DTZTable.splice(DTZTable.begin(), DTZTable, it);
break;
}
// If still not found, add a new one
if (DTZTable.front().key != key) {
if (DTZTable.front().key != key && DTZTable.front().key2 != key) {
WDLEntry* wdlEntry = WDLHash[key];
if (!wdlEntry) {