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diff --git a/assignment1-18/chessboard.h b/assignment1-18/chessboard.h
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+#ifndef CHESSBOARD_H_INCLUDED
+#define CHESSBOARD_H_INCLUDED
+
+/* players
+ */
+enum player {WHITE, BLACK};
+
+/* status return by move()
+ */
+enum mstatus {INVALID, VALID, CHECK, CHECK_MATE};
+
+enum pieces {
+    EMPTY=0,
+    WHITE_PAWN=1, WHITE_KNIGHT=2, WHITE_BISHOP=3, WHITE_ROOK=4, WHITE_QUEEN=5, WHITE_KING=6,
+    BLACK_PAWN=7, BLACK_KNIGHT=8, BLACK_BISHOP=9, BLACK_ROOK=10, BLACK_QUEEN=11, BLACK_KING=12 };
+
+/* UTF8 representation of the pieces, should be used to print the board
+ */
+const static char* utf_8_pieces[13] = {
+    " ", "♙", "♘", "♗", "♖", "♕", "♔", "♟", "♞", "♝", "♜", "♛", "♚" };
+
+/* chess board with values defined in enum pieces
+ */
+struct chessboard {
+    enum pieces position[8][8];
+};
+
+/* set the initial position of the pieces on the board
+ */
+void init_chessboard(struct chessboard * cb);
+
+/* print the board like this:
+
+     a   b   c   d   e   f   g   h
+   ┌───┬───┬───┬───┬───┬───┬───┬───┐
+8  │ ♜ │ ♞ │ ♝ │ ♛ │ ♚ │ ♝ │ ♞ │ ♜ │
+   ├───┼───┼───┼───┼───┼───┼───┼───┤
+7  │ ♟ │ ♟ │ ♟ │ ♟ │ ♟ │ ♟ │ ♟ │ ♟ │
+   ├───┼───┼───┼───┼───┼───┼───┼───┤
+6  │   │   │   │   │   │   │   │   │
+   ├───┼───┼───┼───┼───┼───┼───┼───┤
+5  │   │   │   │   │   │   │   │   │
+   ├───┼───┼───┼───┼───┼───┼───┼───┤
+4  │   │   │   │   │   │   │   │   │
+   ├───┼───┼───┼───┼───┼───┼───┼───┤
+3  │   │   │   │   │   │   │   │   │
+   ├───┼───┼───┼───┼───┼───┼───┼───┤
+2  │ ♙ │ ♙ │ ♙ │ ♙ │ ♙ │ ♙ │ ♙ │ ♙ │
+   ├───┼───┼───┼───┼───┼───┼───┼───┤
+1  │ ♖ │ ♘ │ ♗ │ ♕ │ ♔ │ ♗ │ ♘ │ ♖ │
+   └───┴───┴───┴───┴───┴───┴───┴───┘
+     a   b   c   d   e   f   g   h
+
+ */
+void print_chessboard(struct chessboard * cb);
+
+/* apply the move informed by player p, from/to positions and returns
+ * the corresponding status
+ */
+enum mstatus move(struct chessboard * cb, enum player p, const char * from, const char * to);
+
+#endif