diff --git a/src/piece.h-move-to-temp-migration-bitboard__piece.h b/src/piece.h-move-to-temp-migration-bitboard__piece.h
new file mode 100644
index 0000000..48e3462
--- /dev/null
+++ b/src/piece.h-move-to-temp-migration-bitboard__piece.h
@@ -0,0 +1,71 @@
+/* piece.h - piece definitions.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef PIECE_H
+#define PIECE_H
+
+#include <ctype.h>
+
+#include "chessdefs.h"
+#include "list.h"
+#include "pool.h"
+
+#define PIECE_DEFAULT_VALUE 0
+
+/* initial default values */
+#define PAWN_VALUE    100
+#define KNIGHT_VALUE  300
+#define BISHOP_VALUE  300
+#define ROOK_VALUE    500
+#define QUEEN_VALUE   900
+#define KING_VALUE    20000
+
+typedef struct piece_list_s {
+    piece_t piece;
+    square_t square;
+    short castle;
+    s64 value;
+    struct list_head list;
+} piece_list_t;
+
+/* some default values for pieces
+ */
+extern struct piece_details {
+    char abbrev_w;                                /* used for game notation */
+    char abbrev_b;
+    char *symbol_w;
+    char *symbol_b;                               /* used for game notation */
+    char *name;
+    s64  value;
+} piece_details[];
+
+#define P_NAME(p)      piece_details[E_PIECE(p)].name
+#define P_LETTER(p)    piece_details[E_PIECE(p)].abbrev_w
+#define P_SYM(p)       piece_details[E_PIECE(p)].symbol_b
+#define P_CSHORT(p)    (IS_WHITE(p)? piece_details[E_PIECE(p)].abbrev_w: \
+                        piece_details[E_PIECE(p)].abbrev_b)
+#define P_CSYM(p)      (IS_WHITE(p)? piece_details[E_PIECE(p)].symbol_w: \
+                        piece_details[E_PIECE(p)].symbol_b)
+#define P_VALUE(p)     (piece_details[E_PIECE(p)].value)
+/* use short name or symbol - no effect
+ */
+#define P_USE_UTF      1
+
+void piece_list_print(struct list_head *list);
+pool_t *piece_pool_init();
+void piece_pool_stats();
+piece_list_t *piece_add(pos_t *pos, piece_t piece, square_t square);
+void piece_del(struct list_head *ptr);
+int pieces_del(pos_t *pos, short color);
+
+#endif