Scottish Grandmaster (1992), ICCF International Master (1993)
International Solving Master (2007). Ph.D. in Mathematics. Scottish Champion in 1983, 1991, 1993 and 1995. Commonwealth Champion in 1992. In 2012 and 2013 McNab won the British Problem Solving Championship.
A participant in seventeen Olympiads between 1982 and 2010.
Author of The Fianchetto King’s Indian and co-authored The Ultimate Pirc with John Nunn.
Scottish Grandmaster (1992), ICCF International Master (1993)