COMPUTER: Bishop, half level right.
MCCOY: Well, I had to see it to believe it.
SPOCK: Explain.
MCCOY: They're about to lop off the captain's professional head, and you're sitting here playing chess with the computer.
SPOCK: That is true.
MCCOY: Mister Spock, you're the most cold-blooded man I've ever known.
SPOCK: Why, thank you, Doctor. I've just won my fourth game.
MCCOY: That's impossible.
SPOCK: Observe for yourself. Rook to king's pawn four.
COMPUTER: Bishop, half level right.
SPOCK: Now, this is the computer's move. And now mine. (takes the bishop) Checkmate. Mechanically, the computer's flawless. Therefore, logically, its report of the captain's guilt is infallible. I could not accept that, however.
MCCOY: So you tested the programme bank.
SPOCK: Exactly. I programmed it myself for chess some months ago. The best I should have been able to attain was a draw.
MCCOY: Well, why are you just sitting there?
SPOCK: Transporter room, stand by. We're beaming down.