diff --git a/JEOH/51to60/53.py b/JEOH/51to60/53.py
index e69de29..5c31f9f 100644
--- a/JEOH/51to60/53.py
+++ b/JEOH/51to60/53.py
@@ -0,0 +1,30 @@
+def solution(board, aloe, bloc): #해결못해서 답지참고함
+    ROW, COL = len(board), len(board[0])
+    DR, DC = [-1, 0, 1, 0], [0, 1, 0, -1]
+    def is_valid_pos(r, c):
+        return 0 <= r < ROW and 0 <= c < COL
+    def recursive_func(alpha_pos, beta_pos, visited, step):
+        r, c = alpha_pos if step % 2 == 0 else beta_pos
+        can_move = False 
+        is_opponent_winner = True
+        win_steps, lose_steps = [], []
+        for i in range(4):
+            nr, nc = r + DR[i], c + DC[i]
+            if is_valid_pos(nr, nc) and (nr, nc) not in visited and board[nr][nc]: 
+                can_move = True
+                if alpha_pos == beta_pos:
+                    return True, step + 1
+                win, steps_left = (
+                    recursive_func([nr, nc], beta_pos, visited | {(r, c)}, step + 1)
+                    if step % 2 == 0
+                    else recursive_func(
+                        alpha_pos, [nr, nc], visited | {(r, c)}, step + 1
+                    )
+                )
+                is_opponent_winner &= win
+                (win_steps if win else lose_steps).append(steps_left)
+        if not can_move:
+            return False, step
+        if is_opponent_winner:
+            return False, max(win_steps)
+        return True, min(lose_steps)
\ No newline at end of file
diff --git a/JEOH/81to90/86.py b/JEOH/81to90/86.py
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diff --git a/JEOH/81to90/87.py b/JEOH/81to90/87.py
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diff --git a/JEOH/81to90/88.py b/JEOH/81to90/88.py
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index 0000000..e69de29
diff --git a/JEOH/81to90/89.py b/JEOH/81to90/89.py
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diff --git a/JEOH/81to90/90.py b/JEOH/81to90/90.py
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