Fix a segfault.

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 7876f9314ad93e56242c569e0f79a26e0c7a5498..5b6a048500b0842c1b59a97f7913532139ae54e0 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -303,6 +303,7 @@ void MainThread::search() {
 void Thread::search() {
 
   Stack stack[MAX_PLY+7], *ss = stack+4; // To reference from (ss-4) to (ss+2)
+  Move  pv[MAX_PLY+1];
   Value bestValue, alpha, beta, delta;
   Move  lastBestMove = MOVE_NONE;
   Depth lastBestMoveDepth = DEPTH_ZERO;
@@ -314,6 +315,7 @@ void Thread::search() {
   std::memset(ss-4, 0, 7 * sizeof(Stack));
   for (int i = 4; i > 0; i--)
      (ss-i)->continuationHistory = &this->continuationHistory[NO_PIECE][0]; // Use as sentinel
+  ss->pv = pv;
 
   bestValue = delta = alpha = -VALUE_INFINITE;
   beta = VALUE_INFINITE;
@@ -756,8 +758,9 @@ namespace {
     }
 
     // Step 7. Razoring (~2 Elo)
-    if (   depth < 2 * ONE_PLY
-        && eval <= alpha - RazorMargin)
+    if (   !rootNode // The required rootNode PV handling is not available in qsearch
+        &&  depth < 2 * ONE_PLY
+        &&  eval <= alpha - RazorMargin)
         return qsearch<NT>(pos, ss, alpha, beta);
 
     improving =   ss->staticEval >= (ss-2)->staticEval