winning rate is wrong, when there is no komi

[mrwjx]

Some old game Go game, for example, 100 years ago, there is no komi, the rsgf file shows wrong winning rate.
Black will pay 6.5(Japan rule) or 7.5(Chinese rule) komi to white nowadays , so black has only 45% winning rate even in the first step.

If there is no komi, black has 55% winning rate in the first step, but rsgf file shows only 45% winning rate, it still seem to exist komi.

在一些古老的棋谱中，如100年前的棋谱，生成的RSGF文件显示出错误的胜率。
在如今黑棋有6.5目（日本规则）或是7.5目（中国规则）的贴目，所以黑棋即使在下第一步棋时，也只有45%的胜率。
如果没有贴目，黑棋在第一步时有55%的胜率，但RSGF文件显示只有45%的胜率，就仿佛贴目仍然存在。