Chess Puzzle - Week 4

After the hard puzzle last week, an easy one this week, but remaining with Boris Spassky at the same tournament:



Spassky - Marsalek, Leningrad 1960

White to play

This is a standard mating pattern, so needs to be understood and memorized.

Solution from last week: The killer move from Boris was Bd3! threatening Bd5 to win either Peter's knight or the exchange. Ouch.

And here is a photograph from that tournament - Boris (on the left) is playing William Lombardy, 1st Board of the USA team.