From ae5d2c38e1b9f6a990c29d31a37d6555d197f939 Mon Sep 17 00:00:00 2001
From: mstembera <m_stembera@yahoo.com>
Date: Sun, 23 Dec 2018 07:09:03 -0800
Subject: [PATCH] Turn on random access for Syzygy files in Windows (#1840)

* This is the Windows version of
https://github.com/official-stockfish/Stockfish/pull/1829

No functional change.
---
 src/syzygy/tbprobe.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/syzygy/tbprobe.cpp b/src/syzygy/tbprobe.cpp
index 60979a56..57c7d872 100644
--- a/src/syzygy/tbprobe.cpp
+++ b/src/syzygy/tbprobe.cpp
@@ -224,8 +224,9 @@ public:
             exit(1);
         }
 #else
+        // Note FILE_FLAG_RANDOM_ACCESS is only a hint to Windows and as such may get ignored.
         HANDLE fd = CreateFile(fname.c_str(), GENERIC_READ, FILE_SHARE_READ, nullptr,
-                               OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
+                               OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, nullptr);
 
         if (fd == INVALID_HANDLE_VALUE)
             return *baseAddress = nullptr, nullptr;
-- 
2.39.2