diff --git a/src/piece.c-move-to-temp-migration-bitboard__piece.c b/src/piece.c-move-to-temp-migration-bitboard__piece.c
new file mode 100644
index 0000000..b6e4eeb
--- /dev/null
+++ b/src/piece.c-move-to-temp-migration-bitboard__piece.c
@@ -0,0 +1,118 @@
+/* piece.c - piece list management.
+ *
+ * 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>
+ *
+ */
+
+#include <malloc.h>
+#include <ctype.h>
+
+#include <debug.h>
+#include <pool.h>
+#include <list.h>
+
+#include "chessdefs.h"
+#include "piece.h"
+#include "board.h"
+#include "bitboard.h"
+#include "position.h"
+
+static pool_t *pieces_pool;
+
+struct piece_details piece_details[] = {
+    [E_EMPTY]  = { ' ', ' ', " ", " ", "",       0 },
+    [E_PAWN]   = { 'P', 'p', "♙", "♟", "Pawn",   PAWN_VALUE },
+    [E_KNIGHT] = { 'N', 'n', "♘", "♞", "Knight", KNIGHT_VALUE },
+    [E_BISHOP] = { 'B', 'b', "♗", "♝", "Bishop", BISHOP_VALUE },
+    [E_ROOK]   = { 'R', 'r', "♖", "♜", "Rook",   ROOK_VALUE },
+    [E_QUEEN]  = { 'Q', 'q', "♕", "♛", "Queen",  QUEEN_VALUE },
+    [E_KING]   = { 'K', 'k', "♔", "♚", "King",   KING_VALUE }
+};
+
+void piece_list_print(struct list_head *list)
+{
+    struct list_head *p_cur, *tmp;
+    piece_list_t *piece;
+
+    list_for_each_safe(p_cur, tmp, list) {
+        piece = list_entry(p_cur, piece_list_t, list);
+
+        printf("%s%c%c ", P_SYM(piece->piece),
+               FILE2C(F88(piece->square)),
+               RANK2C(R88(piece->square)));
+    }
+    printf("\n");
+}
+
+pool_t *piece_pool_init()
+{
+    if (!pieces_pool)
+        pieces_pool = pool_create("pieces", 128, sizeof(piece_list_t));
+    return pieces_pool;
+}
+
+void piece_pool_stats()
+{
+    if (pieces_pool)
+        pool_stats(pieces_pool);
+}
+
+piece_list_t *piece_add(pos_t *pos, piece_t piece, square_t square)
+{
+    piece_list_t *new;
+    short color = COLOR(piece);
+
+#   ifdef DEBUG_PIECE
+    log_f(3, "piece=%02x square=%02x\n", piece, square);
+    log_f(5, "Adding %s %s on %c%c\n", color? "Black": "White",
+          P_NAME(piece), FILE2C(F88(square)), RANK2C(R88(square)));
+#   endif
+    if ((new = pool_get(pieces_pool))) {
+        /* first piece is always king */
+        if (PIECE(piece) == KING)
+            list_add(&new->list, &pos->pieces[color]);
+        else
+            list_add_tail(&new->list, &pos->pieces[color]);
+        new->piece = piece;
+        new->square = square;
+        new->castle = 0;
+        new-> value = piece_details[PIECE(piece)].value;
+    }
+
+    return new;
+}
+
+void piece_del(struct list_head *ptr)
+{
+    piece_list_t *piece = list_entry(ptr, piece_list_t, list);
+#   ifdef DEBUG_PIECE
+    log_f(3, "piece=%02x square=%02x\n", piece->piece, piece->square);
+#   endif
+    list_del(ptr);
+    pool_add(pieces_pool, piece);
+    return;
+}
+
+int pieces_del(pos_t *pos, short color)
+{
+    struct list_head *p_cur, *tmp, *head;
+    int count = 0;
+
+    head = &pos->pieces[color];
+
+    list_for_each_safe(p_cur, tmp, head) {
+        piece_del(p_cur);
+        count++;
+    }
+#   ifdef DEBUG_PIECE
+    log_f(3, "color=%d removed=%d\n", color, count);
+#   endif
+    return count;
+}