If question 0 is received, the player makes a measurement in the X basis { | + ⟩ ⟩ , | − − ⟩ ⟩ } . If question 1 is received, the player makes a measurement in the Y basis { 1 2 ( | 0 ⟩ ⟩ + i | 1 ⟩ ⟩ ) , 1 2 ( | 0 ⟩ ⟩ − − i | 1 ⟩ ⟩ ) } . In both cases, the players give answer 0 if the result of the measurement is the first state of the pair, and answer 1 if the result is the second state of the pair.