Classic Advice

From this article:

As a teenage chess prodigy, Garry Kasparov quickly learned to deal with failure.

Twice he clashed with reigning champion Tigran Petrosian, and each time the upstart's aggressive tactics were twisted against him, repelled by "Iron Tigran's" notoriously impenetrable defence.

So on the eve of the their third meeting, the young Mr. Kasparov sought out some advice from the legendary Soviet grandmaster Boris Spassky.

"Squeeze his balls," Mr. Spassky counselled, sidestepping the more delicate intricacies of strategy. "But don't rush into it," he cautioned. "Squeeze one, not both."

The message? Pressure is a good thing, but it must be applied steadily and with purpose.

Yes, I'm sure that interpretation was crystal clear.