@421
"once your opponent finds a move thats deviates but is practically good, you're on your own"
++ You always get to a point where you are on your own, but the deviating move may be an error allowing you to win. You can be confident you made no mistake.
Sure but the point is that this is already the case with engine prepared lines when playing against humans.
@423
"Chess is way more complicated than connect four." ++ Yes
"It has almost infinite positions." ++ There are 4.82*10^44 legal chess positions, 3*10^37 possible from 1 box of 32 chess men, and 10^38 from a luxury box of 32 chess men + spare black & white queens. For a weak solution of chess 10^17 are relevant.
To memorize a weak solution after it is found, it is not necessary to memorize 10^17 positions, but some strategic rules derived from the solution.
Allis showed perfect Connect Four play with 9 strategic rules. For Chess it will be more.