Chess Puzzle of the Week (170)

While Yuri Averbakh was celebrating his 100th birthday, the sad news came through of the death of IM Abram Khasin, just a few days before his 99th birthday.

Khasin, who was wounded in the Battle of Stalingrad, as a result of which both his legs were amputated, had a very long career, remaining active in competitive chess until shortly before his death. He was also a Correspondence GM and a renowned chess coach.

How did Khasin, playing White, continue in this position (from Khasin – Suetin USSR Championship Semifinal 1955)?

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