In the past, it was unclear whether Black should play P-66 or S-77 on move 5.
Today, S-77 is the standard, and this is largely due to the discovery of this strategy.
If Black plays P-66 instead, White can start an attack by pushing P-65.
Now, let’s take a look at how the game develops from here.
References
Shintaro Saito, 常識破りの新戦法 [...]
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