CM (inactive since 1992). In correspondence chess - ICCF title SIM, rating 2500 (inactive since 2006). Author (with Krzysztof Panczyk) of five books [The Cambridge Springs (2002), Offbeat King’s Indian (2004), Ruy Lopez Exchange (2005), The Classical King’s Indian Uncovered (2009) and Queen’s Gambit Declined: Vienna (2018)] and over 70 surveys in a Dutch quarterly New in Chess Yearbook.