Texel: Fixed syzygy probing bug. See official-stockfish/Stockfish#394.

git-svn-id: file:///home/petero/vc/svnrepos/texel/trunk@545 4abc0a36-5a1e-4bec-8e7d-414f7125f69d
peterosterlund2 · Nov 5, 2017 · f36e5be · f36e5be
1 parent 525096a
commit f36e5be
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Showing 2 changed files with 7 additions and 1 deletion.
diff --git a/texellib/src/syzygy/rtb-probe.cpp b/texellib/src/syzygy/rtb-probe.cpp
@@ -576,7 +576,7 @@ int Syzygy::probe_dtz(Position& pos, int *success)
             if (v1 >= 0)
                 v = v1;
         } else if (v < 0) {
-            if (v1 >= 0 || v1 < 100)
+            if (v1 >= 0 || v1 < -100)
                 v = v1;
         } else if (v > 100) {
             if (v1 > 0)

diff --git a/texellibtest/src/tbTest.cpp b/texellibtest/src/tbTest.cpp
@@ -329,6 +329,12 @@ TBTest::rtbTest() {
     ASSERT(resDTZ);
     ASSERT_EQUAL(0, wdl);
     ASSERT_EQUAL(0, dtz);
+
+    pos = TextIO::readFEN("6k1/8/5Q2/6K1/6Pp/8/8/7Q b - g3 0 1");
+    int success;
+    dtz = Syzygy::probe_dtz(pos, &success);
+    ASSERT_EQUAL(1, success);
+    ASSERT_EQUAL(-2, dtz);
 }
 
 /** Test TBProbe::tbProbe() function. */