Earlier quoted context omitted.
> and Tinsley was able to see the win 64 moves into the future. It's more likely that Tinsley was able to see a winning position much closer to the present than that, without bothering about the details of how exactly the winning position 6 turns in the future converted into an actual win 64 moves in the future.
the point is that his winning position was a 64 move convert and he was correct. Lots of players believe they will end up in a winning position, but overlook something while "not bothering with the details". it's less about how much he calculated in that moment and more about the accuracy of his confidence and the work he had to have put in alongside his talent prior to that moment to achieve that confidence and back…
Like, if you're in a chess midgame, there might still 6 major pieces and 4 or 6 minor pieces and tons of pawns on the board. It's tricky to calculate far into the future. At each node, there's easily dozens of possible moves, and 4-8 viable or not-horrible ones. That's becoming a lot of possibilities to consider very quickly.
In an endgame, there's like, 2 kings, 2 pieces and 4 pawns or a similar constellation. There's 6 possible moves, 3 of them immediately lose and 3 are worth thinking about. 2 of them probably only have one possible answer. Suddenly even an utter beginner like me can calculate 4-8 moves. A master-level player probably knows the endgame entirely, or can see 10 - 20 moves into it easily, because the branching factor is a lot lower now.