Responding to defeat with the pride and tenacity of, well, a champion, the IBM computer Deep Blue drew even Sunday in its match against Garry Kasparov, the world's best human chess player, winning the second of their six games and stunning many chess experts with its strategy.

Joel Benjamin, the grandmaster who works with the Deep Blue team, declared breathlessly: "This was not a computer-style game. This was real chess!" He was seconded by others."Nice style!" said Susan Polgar, the women's world champion. "Really impressive. The computer played a champion's style, like Karpov," she continued, referring to Anatoly Karpov, a former world champion who is widely regarded as second in strength only to Kasparov. "Deep Blue made many moves that were based on understanding chess, on feeling the position. We all thought computers couldn't do that."

As is his wont after a loss, Kasparov did not speak to reporters. But an ebullient Deep Blue team did.

"It feels unbelievably great," said Murray Campbell, an IBM researcher who has been working on Deep Blue since 1989. Campbell said that even though Deep Blue defeated Kasparov in the first game of their first match a year ago, there were indications that neither the computer nor Kas-parov had played very well.

"This time it earned the win," Campbell said. "It played beautifully."

Sunday, Deep Blue had the advantage of playing the white pieces and moving first. The game developed slowly, with Kasparov playing cautiously, as he had said he would in the opening games, waiting for the computer to reveal its weaknesses.

"We're not seeing the Garry Kasparov I would play against," said Yasser Seirawan, a grand-master who was providing live commentary on the game. "He has clearly adapted his style. Does adapting make him a better chess player? I don't know."

The problem for Kasparov Sunday was that Deep Blue showed no weaknesses. It held the white advantage throughout, playing a patient opening known as the Ruy Lopez, and in the endgame pressured Kasparov's king with rook and queen threats, never letting him breathe. At one point, Kas-parov, appearing stymied, moved a bishop forward, and two moves later moved it back again, a bit of wasted time that may have cost him.