Round 1, Houdini vs Rybka, was a Sicilian Najdorf, and it ended in a draw.
FYI, I am making it so you can view each and every game and the details of them (how long each engine spent on a particular move, etc.).
View round 1 here: http://www.westportchessclub.org/computer-chess/houdini-vs-rybka-30-games-round-01.htm
The Houdini 1.5a x64 vs Deep Rybka 4.1 SSE42 x64 match will start tomorrow. The time control is 11:30:00.00 + 30 seconds per move, and there will be 30 rounds, each side playing White and Black of a specific opening. Here is the link:
http://www.westportchessclub.org/computer-chess/houdini-vs-rybka-30-games.htm