Kramnik said he would like a rematch in a year or two
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Deep Fritz, a chess-playing computer, has beaten human counterpart world chess champion Vladimir Kramnik in a six-game battle in Bonn, Germany.
Deep Fritz won by four points to two, after taking the last game in 47 moves in a match lasting almost five hours.
Of the six games, Deep Fritz won two and four ended in draws.
The 31-year-old Russian, who received $500,000 (£253,000) for playing the machine, could have walked away with double if he had been successful.
After the game, Mr Kramnik said he was "a bit disappointed" but hoped a rematch could be arranged in a year or two.
"With more time to prepare, I still have a chance," he said.
In 2002, Mr Kramnik held Deep Fritz to a draw after eight games, but the chess software has since been updated, calculating millions of positions every second.