diff --git a/AUTHORS b/AUTHORS
index 8e4241384..fe573fe50 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -180,6 +180,7 @@ Michel Van den Bergh (vdbergh)
 Miguel Lahoz (miguel-l)
 Mikael Bäckman (mbootsector)
 Mike Babigian (Farseer)
+Miloslav Macůrek (maelic13)
 Mira
 Miroslav Fontán (Hexik)
 Moez Jellouli (MJZ1977)
diff --git a/src/search.cpp b/src/search.cpp
index d6ec50aba..bc922119c 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -2005,9 +2005,16 @@ void update_quiet_histories(
 Move Skill::pick_best(const RootMoves& rootMoves, usize multiPV) {
     static PRNG rng(now());  // PRNG sequence should be non-deterministic
 
-    // RootMoves are already sorted by score in descending order
-    Value  topScore = rootMoves[0].score;
-    int    delta    = std::min(topScore - rootMoves[multiPV - 1].score, int(PawnValue));
+    // With tablebases at the root, rootMoves are ordered by tbRank rather than by
+    // score, so compute the score range explicitly to keep 'delta' non-negative.
+    Value topScore = rootMoves[0].score;
+    Value minScore = rootMoves[0].score;
+    for (usize i = 1; i < multiPV; ++i)
+    {
+        topScore = std::max(topScore, rootMoves[i].score);
+        minScore = std::min(minScore, rootMoves[i].score);
+    }
+    int    delta    = std::min(topScore - minScore, int(PawnValue));
     int    maxScore = -VALUE_INFINITE;
     double weakness = 120 - 2 * level;