Henrique Mecking (born 1952) was the first Brazilian to become a Grandmaster (1972) and won back-to-back Interzonals at Petropolis 1973 and Manila 1976. He was ranked as high as World #3 in January 1978, behind only World Champion Anatoly Karpov and Challenger Viktor Kortschnoj!
Unfortunately, he contracted a serious illness in the late 1970s, and this robbed him of a chance to fight for the title. He was only able to return to competition more than two decades later.
Lian-Ann Tan (born 1947) is an International Master and six-time champion of Singapore.
How did Henrique Mecking (White) win material here?