Here Rybka again played very smartly and won the game.

I don't think Rybka played a brilliant game, but in honesty if you
look closely you must say that GC played a really terrible game.
19.... Qe6 for instance, throwing away the queen; even I know better
than that. How can you possibly think something this bad rates above
2000? You seem to have Rybka, well, do an analysis and find all the
bad GC moves.

I don't know why you test beginner level, unless it is for the reason
I previously did, that it is not slow like the other levels. But
really play at least from Easy level. Easy seems to play much better
than Beginner.