diff --git a/assignment/chess b/assignment/chess
deleted file mode 100644
index 214175d..0000000
Binary files a/assignment/chess and /dev/null differ
diff --git a/assignment/chess.c b/assignment/chess.c
index 09ac099..a480d14 100644
--- a/assignment/chess.c
+++ b/assignment/chess.c
@@ -21,10 +21,11 @@ int abs(int value) {
 }
 
 struct ChessPiece get_piece(ChessBoard chess_board, File file, Rank rank) {
-    struct ChessPiece piece;
-    piece.color = chess_board[file - 'a'][rank - 1].piece.color;
-    piece.type = chess_board[file - 'a'][rank - 1].piece.type;
-    return piece;
+    if (file < 'a' || file > 'h' || rank < 1 || rank > 8) { 
+        struct ChessPiece empty = {NO_COLOR, NoPiece};
+        return empty;
+    }
+    return chess_board[file - 'a'][rank - 1].piece;
 }
 
 struct ChessSquare* get_square(ChessBoard chess_board, File file, Rank rank) {
@@ -35,6 +36,10 @@ struct ChessSquare* get_square(ChessBoard chess_board, File file, Rank rank) {
 }
 
 bool squares_share_pawns_move(Color color, MoveType move, File filePiece1, Rank rankPiece1, File filePiece2, Rank rankPiece2) {
+    if ((color == White && rankPiece1 < 2) || (color == Black && rankPiece1 > 7)) {
+        return false;
+    }
+    
     int rank_diff = rankPiece2 - rankPiece1;
     int file_diff = filePiece2 - filePiece1;
 
@@ -110,14 +115,26 @@ bool is_square_occupied(ChessBoard chess_board, File file, Rank rank) {
 }
 
 bool squares_share_file(File file1, Rank rank1, File file2, Rank rank2) {
+    if (file1 < 'a' || file1 > 'h' || file2 < 'a' || file2 > 'h' ||
+        rank1 < 1 || rank1 > 8 || rank2 < 1 || rank2 > 8) {
+        return false;
+    }
     return file1 == file2;
 }
 
 bool squares_share_rank(File file1, Rank rank1, File file2, Rank rank2) {
+    if (file1 < 'a' || file1 > 'h' || file2 < 'a' || file2 > 'h' ||
+        rank1 < 1 || rank1 > 8 || rank2 < 1 || rank2 > 8) {
+        return false;
+    }
     return rank1 == rank2;
 }
 
 bool squares_share_diagonal(File file1, Rank rank1, File file2, Rank rank2) {
+    if (file1 < 'a' || file1 > 'h' || file2 < 'a' || file2 > 'h' ||
+        rank1 < 1 || rank1 > 8 || rank2 < 1 || rank2 > 8) {
+        return false;
+    }
     return abs(file1 - file2) == abs(rank1 - rank2);
 }
 
@@ -154,7 +171,7 @@ bool is_piece(struct ChessPiece piece, Color color, PieceType type) {
 }
 
 bool add_piece(ChessBoard chess_board, File file, Rank rank, struct ChessPiece piece) {
-    if (is_square_occupied(chess_board, file, rank)) {
+    if (file < 'a' || file > 'h' || rank < 1 || rank > 8 || is_square_occupied(chess_board, file, rank)) {
         return false;
     }
 
diff --git a/assignment/chess.o b/assignment/chess.o
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index 72ec27c..0000000
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diff --git a/assignment/chess_main_driver.o b/assignment/chess_main_driver.o
deleted file mode 100644
index a6a215d..0000000
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diff --git a/assignment/chess_printer.o b/assignment/chess_printer.o
deleted file mode 100644
index adfd490..0000000
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diff --git a/assignment/shortcut.o b/assignment/shortcut.o
deleted file mode 100644
index 1816ab8..0000000
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diff --git a/assignment/test_chess.o b/assignment/test_chess.o
deleted file mode 100644
index 62d7e71..0000000
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