From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Sun, 3 Nov 2019 18:05:47 +0000 (+0100)
Subject: Fix mate score for XBoard protocol (#44)
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=ca59dd16567f42848dae2a66baf0b8297e2e7f28;p=fairystockfish.git

Fix mate score for XBoard protocol (#44)
---

diff --git a/src/types.h b/src/types.h
index b7ccc21..67a664e 100644
--- a/src/types.h
+++ b/src/types.h
@@ -303,7 +303,7 @@ enum Value : int {
   VALUE_DRAW      = 0,
   VALUE_KNOWN_WIN = 10000,
   VALUE_MATE      = 32000,
-  XBOARD_VALUE_MATE = 100000,
+  XBOARD_VALUE_MATE = 200000,
   VALUE_INFINITE  = 32001,
   VALUE_NONE      = 32002,
 
diff --git a/src/uci.cpp b/src/uci.cpp
index 5f0249b..ed61569 100644
--- a/src/uci.cpp
+++ b/src/uci.cpp
@@ -471,7 +471,7 @@ string UCI::value(Value v) {
       if (abs(v) < VALUE_MATE - MAX_PLY)
           ss << v * 100 / PawnValueEg;
       else
-          ss << (v > 0 ? XBOARD_VALUE_MATE + v - VALUE_MATE + 1 : -XBOARD_VALUE_MATE + VALUE_MATE + v - 1) / 2;
+          ss << (v > 0 ? XBOARD_VALUE_MATE + VALUE_MATE - v + 1 : -XBOARD_VALUE_MATE - VALUE_MATE - v - 1) / 2;
   } else
 
   if (abs(v) < VALUE_MATE - MAX_PLY)