Tal (White) is ahead only the Exchange for a pawn-a 1-point edge-and would love to pad his advantage with more material. He realizes that if White's Queen were not on e6, he would be able to launch a royal fork with Ne6+. For a tactical genius like Tal, the solution is obvious: 1. Qxf5!. With this one move, he clears the e6-square and devours a Knight at the same time. Black resigns rather than face 1...gxf5 2.Ne6+ Kg6 3. Nxc7, after which the material disparity would be too great for him to hope of catching up.
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