Two bug fixes:

1. Wrong sign in probe_dtz() (fixed in SF master some months ago) which may cause probe_dtz() to return -1 if the position is losing with abs(dtz) > 1 and a (losing) ep capture is available.

2. In testing pawn moves in probe_dtz_no_ep(), probe_ab() was called also if the pawn move is a double push and creates ep rights. But probe_ab() does not test ep captures.

interface/tbprobe.cpp

@@ -485,7 +485,9 @@ static int probe_dtz_no_ep(Position& pos, int *success)
 		|| !pos.legal(move, ci.pinned))
 	continue;
       pos.do_move(move, st, ci, pos.gives_check(move, ci));
-      int v = -probe_ab(pos, -2, -wdl + 1, success);
+      int v = pos.ep_square() == SQ_NONE ? -probe_ab(pos, -2, -wdl + 1, success)
+                                         : -probe_wdl(pos, success);
+
       pos.undo_move(move);
       if (*success == 0) return 0;
       if (v == wdl)
@@ -618,7 +620,7 @@ int 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)