Further progress in the field of computer bridge has resulted in stronger bridge playing programs, including "Jack" and "Wbridge5". These programs have been ranked highly in national bridge rankings. A series of articles published in 2005 and 2006 in the Dutch bridge magazine "IMP" describes matches between five-time computer bridge world champion "Jack" and seven top Dutch pairs including a Bermuda Bowl winner and two reigning European champions. A total of 196 boards were played. "Jack" defeated three out of the seven pairs (including the European champions). Overall, the program lost by a small margin (359 versus 385 IMPs).