diff --git a/src/eval.h-move-to-temp-migration-bitboard__eval.h b/src/eval.h-move-to-temp-migration-bitboard__eval.h
new file mode 100644
index 0000000..de16353
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+++ b/src/eval.h-move-to-temp-migration-bitboard__eval.h
@@ -0,0 +1,37 @@
+/* eval.h - static position evaluation.
+ *
+ * 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 EVAL_H
+#define EVAL_H
+
+#include <limits.h>
+
+#include "chessdefs.h"
+#include "piece.h"
+
+/* max pieces eval is KING_VALUE + 9*QUEEN_VALUE + 2*ROOK_VALUE + 2*BISHOP_VALUE
+ *  + 2*KNIGHT_VALUE which around 30000.
+ * We are on secure side with -50000/+50000
+ */
+#define EVAL_MAX     (50000)
+#define EVAL_MIN     (-EVAL_MAX)
+#define EVAL_INVALID INT_MIN
+#define EVAL_MATE    EVAL_MAX
+
+eval_t eval_material(pos_t *pos, bool color);
+eval_t eval_mobility(pos_t *pos, bool color);
+eval_t eval_square_control(pos_t *pos, bool color);
+
+eval_t eval(pos_t *pos);
+
+#endif  /* EVAL_H */