Raubfisch is an engine derived from Stockfish and Torpedo 1.1 XJR (private engine by Frank Karl Werner and Max Fehler).
WARNING: if you have a single-socket cpu system and you play on time 5 minutes or less use the X version, otherwise (multiprocessor) use the ME version.
Actual versions: Raubfisch X39 and Raubfisch GTZ18.
Maximize its strength by using my opening book Goi.
Raubfisch X single processor benchmark:
Raubfisch ME single processor benchmark: