From 6a6a7d2b221a5b1a53034f3aa439c4f6d28a1395 Mon Sep 17 00:00:00 2001
From: Marco Costalba <mcostalba@gmail.com>
Date: Sat, 21 May 2016 19:55:32 +0200
Subject: [PATCH] Make probe_dtz_table() return correct dtz

---
 src/syzygy/tbprobe.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/syzygy/tbprobe.cpp b/src/syzygy/tbprobe.cpp
index 829ff40b..50620bb2 100644
--- a/src/syzygy/tbprobe.cpp
+++ b/src/syzygy/tbprobe.cpp
@@ -656,7 +656,7 @@ int map_score(DTZEntry* entry, File f, int value, WDLScore wdl)
         ||  wdl == WDLCursedLoss)
         value *= 2;
 
-    return value;
+    return value + 1;
 }
 
 // Compute a unique index out of a position and use it to probe the TB file. To
@@ -1465,7 +1465,7 @@ int Tablebases::probe_dtz(Position& pos, ProbeState* result)
         || *result == WIN_PAWN_MOVE)
         return wdl == WDLWin ? 1 : 101; // DTZ scores for immediate win or cursed win
 
-    int dtz = 1 + probe_dtz_table(pos, wdl, result); // Probe the table!
+    int dtz = probe_dtz_table(pos, wdl, result); // Probe the table!
 
     if (*result != CHANGE_STM)
     {