I know that match is from 2008, but I found it today.
In polish language word "rybka" is soft version of word "fish". Moreover, when I studied mathematics, I had lecture in Functional Analysis with professor Piotr Rybka (he is very good).
We know, that if both players don't take their pieces in 50 moves, the game is ended with draw. But chess engine Rybka is not satisfied with draw when it has advantage and Hikaru knew about it from previous games. What did he do? He used that exploit and "forced" Rybka to do bad capture in 49th move after previous capturing. Rybka did not want a draw, so it made itself lose. It reminds me of Robert Fischer, who hated draws and even boycotted FIDe afte becoming world champion, because they did not accept his proposals in changing of rules to remove points for draws from high-class matches.
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Yeah, I've seen that game many times. It's basically Nakamura trolling the engine as it doesn't understand the position and in the end it was pure trolling, bragging from him. But he got lucky he found a perfect fortress position he could mess around with for a while, otherwise Rybka would have crushed him. Years later he faced Komodo and he had to play handicaps games, because of course he can't do the same with more modern engines.
It's a shame you couldn't participate in the chess initiative we carried out with Chessbrothers and Aliento. Probably you would have been among the winners as there were two missing places.
Intersting. We could analyse our checkmate game with Rybka too: https://peakd.com/hive-129589/@hive-129589/checkmate-coin-arena-of-may-6th-2021-part-2