From 377d77dbe922b99ee34d686e4fe180698a9b535a Mon Sep 17 00:00:00 2001
From: joergoster <osterj165@googlemail.com>
Date: Thu, 13 Jul 2017 16:30:03 -0700
Subject: [PATCH] Provide selective search depth info for each pv move

No functional change

Closes #1166
---
 src/search.cpp | 10 +++++++---
 src/search.h   |  1 +
 src/thread.cpp |  3 +--
 src/thread.h   |  2 +-
 4 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/search.cpp b/src/search.cpp
index 1c000b5b..4551c39d 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -383,6 +383,9 @@ void Thread::search() {
       // MultiPV loop. We perform a full root search for each PV line
       for (PVIdx = 0; PVIdx < multiPV && !Threads.stop; ++PVIdx)
       {
+          // Reset UCI info selDepth for each depth and each PV line
+          selDepth = 0;
+
           // Reset aspiration window starting size
           if (rootDepth >= 5 * ONE_PLY)
           {
@@ -566,8 +569,8 @@ namespace {
         static_cast<MainThread*>(thisThread)->check_time();
 
     // Used to send selDepth info to GUI
-    if (PvNode && thisThread->maxPly < ss->ply)
-        thisThread->maxPly = ss->ply;
+    if (PvNode && thisThread->selDepth < ss->ply)
+        thisThread->selDepth = ss->ply;
 
     if (!rootNode)
     {
@@ -1043,6 +1046,7 @@ moves_loop: // When in check search starts from here
           if (moveCount == 1 || value > alpha)
           {
               rm.score = value;
+              rm.selDepth = thisThread->selDepth;
               rm.pv.resize(1);
 
               assert((ss+1)->pv);
@@ -1525,7 +1529,7 @@ string UCI::pv(const Position& pos, Depth depth, Value alpha, Value beta) {
 
       ss << "info"
          << " depth "    << d / ONE_PLY
-         << " seldepth " << pos.this_thread()->maxPly
+         << " seldepth " << rootMoves[i].selDepth
          << " multipv "  << i + 1
          << " score "    << UCI::value(v);
 
diff --git a/src/search.h b/src/search.h
index 7c46980b..a2a02eda 100644
--- a/src/search.h
+++ b/src/search.h
@@ -64,6 +64,7 @@ struct RootMove {
 
   Value score = -VALUE_INFINITE;
   Value previousScore = -VALUE_INFINITE;
+  int selDepth = 0;
   std::vector<Move> pv;
 };
 
diff --git a/src/thread.cpp b/src/thread.cpp
index 66f74b99..86fce6aa 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -35,7 +35,7 @@ ThreadPool Threads; // Global object
 Thread::Thread() {
 
   exit = false;
-  maxPly = 0;
+  selDepth = 0;
   nodes = tbHits = 0;
   idx = Threads.size(); // Start from 0
 
@@ -210,7 +210,6 @@ void ThreadPool::start_thinking(Position& pos, StateListPtr& states,
 
   for (Thread* th : Threads)
   {
-      th->maxPly = 0;
       th->nodes = 0;
       th->tbHits = 0;
       th->rootDepth = DEPTH_ZERO;
diff --git a/src/thread.h b/src/thread.h
index 77517b07..35cf3efe 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -60,7 +60,7 @@ public:
   Material::Table materialTable;
   Endgames endgames;
   size_t idx, PVIdx;
-  int maxPly;
+  int selDepth;
   std::atomic<uint64_t> nodes, tbHits;
 
   Position rootPos;
-- 
2.39.2