From 7f300a769848c695fb28da444b0c3f4c1d919945 Mon Sep 17 00:00:00 2001
From: Joona Kiiski <joona.kiiski@gmail.com>
Date: Tue, 25 Aug 2015 20:52:44 +0100
Subject: [PATCH] History gravity

Instead of using hard coded Min and Max values for history,
always adjust the old value slightly downwards before adding a new value.

The adjustment acts like gravity that prevents the value escaping too
far from zero.

Bench: 8020484

Resolves #407
---
 src/movepick.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/movepick.h b/src/movepick.h
index b281bd42..412c08e2 100644
--- a/src/movepick.h
+++ b/src/movepick.h
@@ -39,7 +39,7 @@
 template<typename T>
 struct Stats {
 
-  static const Value Max = Value(250);
+  static const Value Max = Value(1<<28);
 
   const T* operator[](Piece pc) const { return table[pc]; }
   T* operator[](Piece pc) { return table[pc]; }
@@ -53,8 +53,8 @@ struct Stats {
 
   void update(Piece pc, Square to, Value v) {
 
-    if (abs(table[pc][to] + v) < Max)
-        table[pc][to] += v;
+    table[pc][to] -= table[pc][to] * std::min(abs(int(v)), 512) / 512;
+    table[pc][to] += int(v) * 64;
   }
 
 private:
-- 
2.39.2