Wonder if they'll keep up the ambiguity of whether it's something supernatural or Kakeru's subconscious kicking in to emulate his brother through pure talent+years of watching Suguru super closely.
If he really used a strategy he couldn't possibly know about any other way, I guess it's...
Sorry guys, it's my fault every manga and webnovel has school arcs and tournament arcs, they're doing it for me. I'm the slack-jawed idiot that still enjoys them.