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diff --git a/apps/plugins/reversi/reversi-game.h b/apps/plugins/reversi/reversi-game.h
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+++ b/apps/plugins/reversi/reversi-game.h
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+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (c) 2006 Alexander Levin
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef _REVERSI_GAME_H
+#define _REVERSI_GAME_H
+
+#include <stdbool.h>
+
+#define WHITE 1       /* WHITE constant, it always plays first (as in chess) */
+#define BLACK 2       /* BLACK constant */
+#define FREE  0       /* Free place constant */
+
+#define BOARD_SIZE 8
+#define INIT_STONES 4
+
+/* Description of a move. A move is stored as a byte in the following format:
+ * - bit  7   : 0 for valid entries (i.e. those containing a move info,
+ *              1 for invalid entries
+ * - bits 6..4: row
+ * - bit  3   : 0 if it's white move, 1 if it's black move
+ * - bits 2..0: column
+ */
+typedef unsigned char move_t;
+
+#define MOVE_ROW(h) (((h) >> 4) & 0x7)
+#define MOVE_COL(h) ((h) & 0x7)
+#define MOVE_PLAYER(h) (((h) & 0x8) ? BLACK : WHITE)
+#define MAKE_MOVE(r,c,player) ( ((r)<<4) | ((c)&0x7) | \
+           ((player) == WHITE ? 0 : 0x8) )
+#define MOVE_INVALID 0x80
+
+
+/* State of a board */
+typedef struct _reversi_board_t {
+    /* The current state of the game (BLACK/WHITE/FREE) */
+    char board[BOARD_SIZE][BOARD_SIZE];
+
+    /* Game history. First move (mostly, but not necessarily, black) is stored
+     * in history[0], second move (mostly, but not necessarily, white) is
+     * stored in history[1] etc.
+     */
+    move_t history[BOARD_SIZE*BOARD_SIZE - INIT_STONES];
+} reversi_board_t;
+
+
+void reversi_init_game(reversi_board_t *game);
+int reversi_flipped_color(const int color);
+bool reversi_game_is_finished(const reversi_board_t *game);
+int reversi_get_turn(const reversi_board_t *game);
+int reversi_count_occupied_cells(const reversi_board_t *game,
+        int *white_count, int *black_count);
+int reversi_count_moves(const reversi_board_t *game);
+int reversi_count_white_moves(const reversi_board_t *game);
+int reversi_count_black_moves(const reversi_board_t *game);
+int reversi_make_move(reversi_board_t *game, const int row,
+        const int col, const int player);
+
+
+#endif