diff --git a/notes/src/chess.md b/notes/src/chess.md
index 611c1aa..0da47cb 100644
--- a/notes/src/chess.md
+++ b/notes/src/chess.md
@@ -1,3 +1,7 @@
 # 棋盘问题
 
 棋盘问题：N 皇后，解数独等等
+
+## [51. N 皇后](https://leetcode.cn/problems/n-queens/)
+
+## [37. 解数独](https://leetcode.cn/problems/sudoku-solver/)