1 files changed, 12 insertions, 1 deletions
diff --git a/src/testsearch.c b/src/testsearch.c
index 380dfba..3d560ac 100644
--- a/src/testsearch.c
+++ b/src/testsearch.c
@@ -53,8 +53,19 @@ TestSearch(void)
     for (u = 0; u < 20; u++)
     {
         GenerateRandomLegalPosition(&pos);
+        // Log the exact FEN before searching it -- a crash partway
+        // through this loop otherwise gives no way to reproduce which
+        // of the 20 random positions triggered it (this cost real
+        // debugging time chasing an intermittent failure whose
+        // position was never captured -- see board_representation/
+        // MOVEGEN_MIGRATION.md section 6b).
+        {
+            char *pszFen = PositionToFen(&pos);
+            Trace("TestSearch position %lu/20: %s\n", u + 1,
+                  pszFen ? pszFen : "(PositionToFen failed)");
+        }
         InitializeSearcherContext(&pos, ctx);
-    
+
         g_MoveTimer.bvFlags = 0;
         g_Options.fPondering = FALSE;
         g_Options.fThinking = TRUE;