Fix sortng of mate scores

[xboard.git] / engineoutput.c

diff --git a/engineoutput.c b/engineoutput.c
index d6fde3c..0bfd8b5 100644 (file)
--- a/engineoutput.c
+++ b/engineoutput.c
@@ -402,6 +402,14 @@ SetEngineColorIcon (int which)
 // [HGM] multivar: sort Thinking Output within one depth on score
 
 static int
+MateFlip (int n)
+{   // map mate-score to monotonous scale, so sorting compares them correctly
+    if(n >=  MATE_SCORE) return 2*MATE_SCORE - n;
+    if(n <= -MATE_SCORE) return -2*MATE_SCORE - n;
+    return n;
+}
+
+static int
 InsertionPoint (int len, EngineOutputData *ed)
 {
        int i, offs = 0, newScore = ed->score, n = ed->which;
@@ -425,7 +433,7 @@ InsertionPoint (int len, EngineOutputData *ed)
                keys[i+n+2] = ed->moveKey;
                fail[i+n+2] = failType;
                if(ed->moveKey != keys[i+n] && // same move always tops previous one (as a higher score must be a fail low)
-                  newScore < scores[i+n] && fail[i+n] == ' ') break;
+                  MateFlip(newScore) < MateFlip(scores[i+n]) && fail[i+n] == ' ') break;
                // if it had higher score as previous, move previous in stead
                scores[i+n+2] = ed->moveKey == keys[i+n] ? newScore : scores[i+n]; // correct scores of fail-low/high searches
                textEnd[i+n+2] = textEnd[i+n] + len;