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 36db8d2b65200a9bb5e2f829d35a0ae0722ef253..591d48fbb41b3254bf8cef4c6a63edcebe91c94a 100644 (file)
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -1960,26 +1960,26 @@ bool Position::has_mate_threat(Color c) {
 
 void Position::init_zobrist() {
 
 
 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++)
 
   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++)
 
   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;

 }
 
 
 }