Houdini 4 PRO Aquarium - Chess Software Houdini 4 PRO Aquarium is a revolutionary analysis, database and chess publishing tool, combined with the world's strongest chess playing engine, Houdini 4 PRO Houdini 4 PRO Aquarium offers advanced analysis functions Game commenting, searching, powerful chess trees, playing against the computer, databases, advanced publishing features and a base of 6 million games Houdini 4 PRO is the World's strongest chess engine, capable of supporting up to 32 cores and 32 GB of hash. You can connect Houdini 4 PRO UCI engine to Chess Assistant, Fritz and ChessBase Online access to 7-piece Lomonosov Endgame Tablebases via the program's interface