In chess so much depends on opening theory, so the champions before the last century did not know as much as I do and other players do about opening theory. So if you just brought them back from the dead they wouldn't do well. They'd get bad openings.
Bobby FischerOur mind is all we've got. Not that it won't lead us astray sometimes, but we still have to analyze things out within ourselves.
Bobby FischerCapablanca was among the greatest of chess players, but not because of his endgame. His trick was to keep his openings simple, and then play with such brilliance in the middlegame that the game was decided - even though his ooponent didn't always know it - before they arrived at the ending.
Bobby Fischer