diff --git a/src/eval-simple.h-move-to-temp-migration-bitboard__eval-simple.h b/src/eval-simple.h-move-to-temp-migration-bitboard__eval-simple.h
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+/* eval-simple.h - simple 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_SIMPLE_H
+#define EVAL_SIMPLE_H
+
+
+#include "chessdefs.h"
+
+/* no queen on board */
+#define simple_no_queen(p, c)              \
+    ( !(p)->bb[c][BB_QUEEN] )
+
+#define simple_one_queen(p, c)             \
+    ( popcount64((p)->bb[c][BB_QUEEN]) == 1 )
+
+#define simple_no_rook(p, c)               \
+    (!(p)->bb[c][BB_ROOK])
+
+#define simple_one_minor_piece(p, c)       \
+    (popcount64((p)->bb[c][BB_KNIGHT] | (p)->bb[c][BB_BISHOP]) == 1)
+
+#define simple_is_endgame(p)                  \
+    ( (simple_no_queen(p, WHITE)   ||         \
+       (simple_one_queen(p, WHITE) &&         \
+        simple_no_rook(p, WHITE)   &&         \
+        simple_one_minor_piece(p, WHITE)))    \
+      &&                                      \
+      (simple_no_queen(p, BLACK)   ||         \
+       (simple_one_queen(p, BLACK) &&         \
+        simple_no_rook(p, BLACK)   &&         \
+        simple_one_minor_piece(p, BLACK))) )
+
+void eval_simple_init(void);
+eval_t eval_simple(pos_t *pos);
+
+#endif  /* EVAL_SIMPLE_H */