diff --git a/src/eval.c-move-to-temp-migration-bitboard__eval.c b/src/eval.c-move-to-temp-migration-bitboard__eval.c
new file mode 100644
index 0000000..0462bd5
--- /dev/null
+++ b/src/eval.c-move-to-temp-migration-bitboard__eval.c
@@ -0,0 +1,95 @@
+/* eval.c - static position evaluation.
+ *
+ * Copyright (C) 2021-2023 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 <stdio.h>
+
+#include <list.h>
+#include <debug.h>
+
+#include "position.h"
+#include "eval.h"
+#include "eval-simple.h"
+
+inline eval_t eval_material(pos_t *pos, bool color)
+{
+    eval_t res = 0;
+
+    /* I need to do something about the king, if it can be potentially taken
+     * if pseudo-moves include a pinned piece on King.
+     */
+    for (uint piece = PAWN; piece < KING; piece <<= 1) {
+        uint bb = PIECETOBB(piece);
+#       ifdef DEBUG_EVAL
+        log_f(2, "color=%u piece=%u bb=%u=%c count=%ul val=%ld\n",
+              color, piece, bb, P_LETTER(piece), popcount64(pos->bb[color][bb]),
+              P_VALUE(piece));
+#       endif
+        /* attention here */
+        res += popcount64(pos->bb[color][bb]) * P_VALUE(piece);
+    }
+    return res;
+}
+
+inline eval_t eval_mobility(pos_t *pos, bool color)
+{
+    return pos->mobility[color];
+}
+
+inline eval_t eval_square_control(pos_t *pos, bool color)
+{
+    return popcount64(pos->controlled[color]);
+}
+
+eval_t eval(pos_t *pos)
+{
+    eval_t simple = 0, control[2] = {0};
+
+    if (pos->eval != EVAL_INVALID)
+        return pos->eval;
+
+    /* 1) pieces value */
+    //material[WHITE] = eval_material(pos, WHITE);
+    //material[BLACK] = eval_material(pos, BLACK);
+    simple = eval_simple(pos);
+
+#   ifdef DEBUG_EVAL
+    log_f(2, "eval_simple=%d\n", simple);
+#   endif
+
+    /* 2) square control: 10 square controls diff = 1 pawn */
+    control[WHITE] = eval_square_control(pos, WHITE);
+    control[BLACK] = eval_square_control(pos, BLACK);
+
+#   ifdef DEBUG_EVAL
+    log_f(2, "square control: W:%d B:%d diff=%d\n",
+          control[WHITE], control[BLACK],
+          (control[WHITE] - control[BLACK]) * 10);
+#   endif
+
+    /* 3) mobility: 10 mobility diff = 1 pawn
+     */
+#   ifdef DEBUG_EVAL
+    log_f(2, "mobility: W:%u B:%u diff=%d\n",
+          pos->mobility[WHITE], pos->mobility[BLACK],
+          (pos->mobility[WHITE] - pos->mobility[BLACK]) * 10);
+#   endif
+
+    eval_t res = simple +
+        (control[WHITE] - control[BLACK]) * 10 +
+        (pos->mobility[WHITE] - pos->mobility[BLACK]) * 10;
+#   ifdef DEBUG_EVAL
+    log_f(2, "eval: %d\n", res);
+#   endif
+    pos->eval = res;
+    return res;
+}