Complete the following sentence: Aitken learned chess from his father at age 10. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ ️<unk>️<unk>️<unk> ️<unk>️<unk>️<unk>️<unk>️ Aitken represented Scotland in four Chess Olympiads. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ He played second board at Munich 1958 and Tel Aviv 1964, scoring 67.6% and 28.1% respectively. <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk>
Skopje 1972, 38,9%.