Tal's Knight Sacrifice

Only six games into their first World Championship match, twenty three year old Mihail Tal produced the game that both defined his style and effectively decided the destination of the title. In a King's Indian where Botvinnik had built a solid space advantage, Tal offered a piece with 21...Nf4!?, a sacrifice with no forcing follow-up and no immediate threats, simply trusting that the resulting complications would favour him more than they favoured the World Champion.

Botvinnik, one of the most rigorous calculators of his generation, took the piece and found himself unable to consolidate; Tal's remaining pieces generated wave after wave of tactical problems, and by the time the position settled Tal had won back more material than he had given up, emerging with an extra pawn and a won endgame that he converted with two knights against a rook. It was exactly the kind of purely intuitive sacrifice, offered without a forced win already in hand, that made Tal so difficult for his more methodical opponents to prepare for.

Tal went on to win the match and become, at twenty three, the youngest World Champion of his era, a record that stood until Kasparov broke it a quarter of a century later. This game is still cited as one of the clearest single examples of why Tal's contemporaries found him so hard to prepare for: engines confirm the sacrifice was objectively sound, but finding it over the board, on instinct, is a different matter entirely.