from which move do they differ?

The Italian Game and the Scotch Game differ after white’s third move. In the Italian Game,
white will play the move 3. Bc4, while in the Scotch Game white will play the move 3. Qf3.
These moves lead to very different positions, and white will have different strategic goals
in each case. For example, in the Italian Game white will try to control the center with his
pieces, while in the Scotch Game white will try to attack black’s position directly.

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LLaMA- Open and Efficient Foundation Language Models