Challenger Gary Kasparov tied up the world chess championship match yesterday in Moscow with a 25-move victory over defending champion Anatoly Karpov. This ties the match score at 5 1/2-5 1/2, but Kasparov must win at least one more game to become the champion. Karpov retains the title if the match is drawn.

In typical swashbuckling style, Kasparov won the 11th match-game with a queen sacrifice -- the most spectacular move in chess and one seldom seen in the cautious atmosphere of a world championship match.

In its pacing, this game resembled the last two in the series, which were draws held by Karpov after Kasparov had seized the initiative. In all three games, Kasparov found unexpected threats in what looked like a quiet middle-game position and launched a relentless, no-holds-barred attack. This time, Karpov could find no answer to the surprise queen sacrifice on move 23, and the champion resigned two moves later, facing the loss of at least two rooks and a minor piece in exchange for Kasparov's queen.

Kasparov's 25th move, a discovered attack, made the loss of Karpov's second rook inevitable and put the challenger in a position threatening further attacks and possibly a quick checkmate. In the final position (see diagram), Karpov's only practical response is 25 . . . g6, allowing 26 Rxd7, which threatens the black bishop on b7. If black then plays 26 . . . Ba6, white can take the black knight (27 Bxc6), and black cannot recapture because his queen must guard the f-file (if 27 . . . Qxc6; 28 Rxf7, mate.)

On top of all his other threats, Kasparov also has the chance of Ne5, with a double attack on the f-pawn, once the black knight is removed. It is no exaggeration to say that in this game the world champion was not only defeated, he was humiliated.

White Black -- Kasparov Karpov

1. d4Nf6 2. c4e6 3. Nc3Bb4 4. Nf30-0 5. Bg5c5 6. e3cxd4 7. exd4h6 8. Bh4d5 9. Rc1dxc4 10. Bxc4Nc6 11. 0-0Be7 12. Re1b6 13. a3Bb7 14. Bg3Rc8 15. Ba2Bd6 16. d5Nxd5 17. Nxd5Bxg3 18. hxg3exd5 19. Bxd5Qf6 20. Qa4R(f)d8 21. R(c)d1Rd7 22. Qg4R(c)d8 23. Qxd7!Rxd7 24. Re8ch!Kh7 25. Be4ch Resigns