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Fix searching terminal nodes in gensfen.

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This commit is contained in:
Tomasz Sobczyk
2020-11-13 22:28:28 +01:00
committed by nodchip
parent 00bc80c3c4
commit 50358e26c7
1 changed files with 12 additions and 4 deletions
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16
src/search.cpp
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@@ -1976,7 +1976,7 @@ namespace Search
// Initialization for learning.
// Called from Learner::search(),Learner::qsearch().
static void init_for_search(Position& pos, Stack* ss)
static bool init_for_search(Position& pos, Stack* ss)
{
// RootNode requires ss->ply == 0.
@@ -2026,7 +2026,10 @@ namespace Search
for (auto m: MoveList<LEGAL>(pos))
rootMoves.push_back(Search::RootMove(m));
assert(!rootMoves.empty());
// Check if we're at a terminal node. Otherwise we end up returning
// malformed PV later on.
if (rootMoves.empty())
return false;
th->UseRule50 = bool(Options["Syzygy50MoveRule"]);
th->ProbeDepth = int(Options["SyzygyProbeDepth"]);
@@ -2042,6 +2045,8 @@ namespace Search
Tablebases::rank_root_moves(pos, rootMoves);
}
return true;
}
// Stationary search.
@@ -2061,7 +2066,9 @@ namespace Search
Stack stack[MAX_PLY+10], *ss = stack+7;
Move pv[MAX_PLY+1];
init_for_search(pos, ss);
if (!init_for_search(pos, ss))
return {};
ss->pv = pv; // For the time being, it must be a dummy and somewhere with a buffer.
if (pos.is_draw(0)) {
@@ -2116,7 +2123,8 @@ namespace Search
Stack stack[MAX_PLY + 10], * ss = stack + 7;
Move pv[MAX_PLY + 1];
init_for_search(pos, ss);
if (!init_for_search(pos, ss))
return {};
ss->pv = pv; // For the time being, it must be a dummy and somewhere with a buffer.