From 67a91d5554b98e2e70566f8f68266e104d563b6b Mon Sep 17 00:00:00 2001
From: 22nsuk <32119488+22nsuk@users.noreply.github.com>
Date: Mon, 26 Oct 2026 15:45:56 +0900
Subject: [PATCH] Fix White winner for unscored SGF training results

---
 cpp/command/runtests.cpp          |  1 +
 cpp/command/writetrainingdata.cpp | 48 ++++++++++++++++++++++++++-----
 cpp/tests/tests.h                 |  3 ++
 3 files changed, 45 insertions(+), 7 deletions(-)

diff --git a/cpp/command/runtests.cpp b/cpp/command/runtests.cpp
index e7dfa0c90c..0f909f7d93 100644
--- a/cpp/command/runtests.cpp
+++ b/cpp/command/runtests.cpp
@@ -52,6 +52,7 @@ int MainCmds::runtests(const vector<string>& args) {
   Tests::runBoardStressTest();
 
   Tests::runSgfTests();
+  Tests::runTrainingDataResultTests();
   Tests::runBasicSymmetryTests();
   Tests::runBoardSymmetryTests();
   Tests::runSymmetryDifferenceTests();
diff --git a/cpp/command/writetrainingdata.cpp b/cpp/command/writetrainingdata.cpp
index 70119884a0..fcaca4a262 100644
--- a/cpp/command/writetrainingdata.cpp
+++ b/cpp/command/writetrainingdata.cpp
@@ -13,6 +13,7 @@
 #include "../program/play.h"
 #include "../command/commandline.h"
 #include "../core/test.h"
+#include "../tests/tests.h"
 #include "../main.h"
 
 #include <chrono>
@@ -20,6 +21,14 @@
 
 using namespace std;
 
+// Called after normalizing the result; other result forms have their own handling.
+static bool parseSgfResultWithoutScore(const string& s, Player& winner) {
+  if(s != "b+" && s != "w+")
+    return false;
+  winner = s == "b+" ? P_BLACK : P_WHITE;
+  return true;
+}
+
 static ValueTargets makeForcedWinnerValueTarget(Player winner) {
   ValueTargets targets;
   if(winner == C_EMPTY) {
@@ -41,6 +50,37 @@ static ValueTargets makeForcedWinnerValueTarget(Player winner) {
   return targets;
 }
 
+void Tests::runTrainingDataResultTests() {
+  cout << "Running training data result tests" << endl;
+  struct TestCase {
+    const char* result;
+    Player winner;
+  };
+  const TestCase cases[] = {
+    {"B+",P_BLACK}, {"W+",P_WHITE}, {"b+",P_BLACK}, {"w+",P_WHITE},
+    {" B+ ",P_BLACK}, {" w+ ",P_WHITE}
+  };
+  for(const TestCase& testCase: cases) {
+    std::unique_ptr<Sgf> sgf = Sgf::parse(string("(;GM[1]FF[4]SZ[9]RE[") + testCase.result + "])");
+    string result = Global::trim(Global::toLower(sgf->getRootPropertyWithDefault("RE", "")));
+    Player winner = C_EMPTY;
+    testAssert(parseSgfResultWithoutScore(result,winner));
+    testAssert(winner == testCase.winner);
+    ValueTargets targets = makeForcedWinnerValueTarget(winner);
+    // Training values are stored from White's perspective before per-row conversion.
+    testAssert(targets.win == (testCase.winner == P_WHITE ? 1.0f : 0.0f));
+    testAssert(targets.loss == (testCase.winner == P_BLACK ? 1.0f : 0.0f));
+    testAssert(targets.noResult == 0.0f);
+    testAssert(targets.score == (testCase.winner == P_WHITE ? 0.5f : -0.5f));
+    testAssert(!targets.hasLead);
+  }
+  for(const char* result: {"", "?", "draw", "b+r", "w+t", "w+3.5"}) {
+    Player winner = C_EMPTY;
+    testAssert(!parseSgfResultWithoutScore(result,winner));
+    testAssert(winner == C_EMPTY);
+  }
+}
+
 static void getNNEval(
   const Board& board,
   const BoardHistory& hist,
@@ -1575,15 +1615,9 @@ int MainCmds::writetrainingdata(const vector<string>& args) {
           return;
         }
       }
-      else if(s == "b+") {
-        sgfGameEnded = true;
-        sgfGameEndedButRecordIncomplete = true;
-        sgfGameWinner = P_BLACK;
-      }
-      else if(s == "w+") {
+      else if(parseSgfResultWithoutScore(s,sgfGameWinner)) {
         sgfGameEnded = true;
         sgfGameEndedButRecordIncomplete = true;
-        sgfGameWinner = P_BLACK;
       }
       else {
         logger.write("Game ended with unknown result " + fileName + " result " + sgfResult);
diff --git a/cpp/tests/tests.h b/cpp/tests/tests.h
index 90c28f663b..fcf6da6bbc 100644
--- a/cpp/tests/tests.h
+++ b/cpp/tests/tests.h
@@ -40,6 +40,9 @@ namespace Tests {
   void runSgfTests();
   void runSgfFileTests();
 
+  //command/writetrainingdata.cpp
+  void runTrainingDataResultTests();
+
   //testnninputs.cpp
   void runNNInputsV3V4Tests();
   void runExcludeTerritoryAtariNNInputsTests();