(IP 
  (NP-PN-SBJ 
    (NR 俞斌))
                    
  (VP 
    (ADVP 
      (AD 再次))
                    
    (VP 
      (VV 挑战)
                    
      (NP-OBJ 
        (DNP 
          (NP-PN 
            (NR 韩国))
                    
          (DEG 的))
                    
        (NP-APP 
          (QP 
            (NP 
              (NN 世界))
                    
            (QP 
              (OD 头)
                    
              (CLP 
                (M 号))))
                    
          (NP 
            (NN 棋手)))
                    
        (NP 
          (NP-PN 
            (NR 李昌镐))
                    
          (QP 
            (CD 九)
                    
            (CLP 
              (M 段))))))))
arg0: 
                    俞斌 
                
arg1: 
                    韩国 的 世界 头 号 棋手 李昌镐 九 段 
                
argm: 
                    再次