Something else- today you can run programs that play chess at superhuman levels on your phone. At the time of DeepBlue's win against Kasparov the same kind of system could run on off-the-shelve hardware [1]. Very soon after AI programs running on ordinary laptops demonstrated dominance against human masters (that's in Russel & Norvig, somewhere, I can dig it up if you like).

So the fact that Cho Chikun won against a less powerful machine is not necessarily an indication that the entire system is weaker than DeepMind's one. To know that you'd have to run Zen against AlphaGo.

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[1] A big hint of why it didn't is that, at the time, IBM was still selling more hardware than software.