diff --git a/src/bitboard.c-move-to-temp-migration-bitboard__bitboard.c b/src/bitboard.c-move-to-temp-migration-bitboard__bitboard.c
new file mode 100644
index 0000000..7034183
--- /dev/null
+++ b/src/bitboard.c-move-to-temp-migration-bitboard__bitboard.c
@@ -0,0 +1,42 @@
+/* bitboard.c - bitboard functions.
+ *
+ * Copyright (C) 2024 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 "br.h"
+#include "bitboard.h"
+
+/*  maps are clockwise from N */
+static char knight_vector[8] = {
+    NORTH*2 + EAST, NORTH + EAST*2, SOUTH + EAST*2, SOUTH*2 + EAST,
+    SOUTH*2 + WEST, SOUTH + WEST*2, NORTH + WEST*2, NORTH*2 + WEST
+};
+static char king_vector[8] = {
+    NORTH, NORTH_EAST, EAST, SOUTH_EAST,
+    SOUTH, SOUTH_WEST, WEST, NORTH_WEST
+};
+
+static u64 knight_attacks[64], king_attacks[64];
+static int zob=0;
+
+void bitboard_init(void)
+{
+    for (int sq = SQ_0; sq < SQ_N; ++sq) {
+        /* knight/king */
+        for (int j = 0; j < 8; ++j) {
+            zob += *knight_attacks + *king_attacks + *knight_vector +
+                *king_vector;
+            //int dest_knight = sq + knight_vector[j];
+            //if ()
+        }
+
+    }
+}
diff --git a/test/eval.c b/test/eval-test.c
similarity index 100%
rename from test/eval.c
rename to test/eval-test.c
diff --git a/test/fen.c b/test/fen-test.c
similarity index 100%
rename from test/fen.c
rename to test/fen-test.c
diff --git a/test/move.c b/test/move-test.c
similarity index 100%
rename from test/move.c
rename to test/move-test.c
diff --git a/test/piece.c b/test/piece-test.c
similarity index 100%
rename from test/piece.c
rename to test/piece-test.c