Use negative IDs for guess list

words.php

@@ -107,6 +107,14 @@ function add_words($datestamp) {
 				break;
 	
 			$word = json_decode($content, true);
+
+			// The Times' IDs for guess list answers don't seem to have any
+			// relation to the sorted list, so we're doing our own which is:
+			// The index in the guess list array, but 1 indexed and negative
+			require_once('word_lists.php');
+			if($word['id'] > count(CHOICES)) {
+				$word['id'] = -(array_search(strtoupper($word['solution']), GUESSES) + 1);
+			}
 		
 			// Add word to database
 			$query = 'INSERT INTO words (id, solution, print_date, days_since_launch, editor) ' .