Lines of 残局文料/问之高频/残局难度怎样.txt from check-in ef883730cb that are changed by the sequence of edits moving toward check-in 6aa392e9d4:

                         1: 1_ 残局难度怎样
                         2: 制局者，欲难可极难，欲易可极易。
                         3: 但观玩局者之普怨，大都言难。
                         4: 但局分难易，寻「易局」而解则易，寻「难局」而解则难。
                         5: 我觉，印卡局普难。