From: Marco Costalba <mcostalba@gmail.com>
Date: Tue, 24 Mar 2009 09:40:22 +0000 (+0100)
Subject: Let zobrist keys to be compatible with Glaurung 1
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=d3f99aea6b6a7653c2d60ac94e600b1b2f5800e1;hp=0e835bd33496ef7ee467de6fd34c544191e4bab0

Let zobrist keys to be compatible with Glaurung 1

Some changes to the zobrist keys, to make them identical
to those used by Glaurung 1.

The only purpose is to make it possible for both programs
to use the same opening book.

Merged from Glaurung current development snapshot.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
---

diff --git a/src/position.cpp b/src/position.cpp
index 36db8d2b..591d48fb 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -1960,26 +1960,26 @@ bool Position::has_mate_threat(Color c) {
 
 void Position::init_zobrist() {
 
-  for (int i = 0; i < 2; i++)
-      for (int j = 0; j < 8; j++)
-          for (int k = 0; k < 64; k++)
-              zobrist[i][j][k] = Key(genrand_int64());
+  for(Piece p = WP; p <= BK; p++)
+      for(Square s = SQ_A1; s <= SQ_H8; s++)
+          zobrist[color_of_piece(p)][type_of_piece(p)][s] = genrand_int64();
 
-  for (int i = 0; i < 64; i++)
-      zobEp[i] = Key(genrand_int64());
+  zobEp[0] = 0ULL;
+  for(int i = 1; i < 64; i++)
+      zobEp[i] = genrand_int64();
 
-  for (int i = 0; i < 16; i++)
-      zobCastle[i] = genrand_int64();
+  for(int i = 15; i >= 0; i--)
+      zobCastle[(i&8) | (i&1) | ((i&2) << 1) | ((i&4) >> 1)] = genrand_int64();
 
   zobSideToMove = genrand_int64();
 
   for (int i = 0; i < 2; i++)
       for (int j = 0; j < 8; j++)
           for (int k = 0; k < 16; k++)
-              zobMaterial[i][j][k] = (k > 0)? Key(genrand_int64()) : Key(0LL);
+              zobMaterial[i][j][k] = (k > 0)? genrand_int64() : 0LL;
 
   for (int i = 0; i < 16; i++)
-      zobMaterial[0][KING][i] = zobMaterial[1][KING][i] = Key(0ULL);
+      zobMaterial[0][KING][i] = zobMaterial[1][KING][i] = 0ULL;
 }