Fischer – Euwe, 1960
White to move. Fischer’s move was based on the deep strategic understanding of the role of pieces in this position. He identified that among Black’s pieces, only one is serving a useful defensive purpose, and only one of White’s pieces has not yet joined the battle. As a result of this observation, Fischer immediately traded off that pair of pieces, that left Black pieces tied up, and his ‘a7’ pawn – even more vulnerable.