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In the lesson AKO098 Caro-Kann Defence 4....Nd7 there is an error in the text for one of the move tries. In the position below I tried 6.Qf3, the text states that this move loses time after 6....Nxe4 7.Qxe4 Nf6, but this overlooks that after 6....Nxe4 white has 7.Qxf7#.
I think that some of the reponses are a bit lazy e.g. You have missed the point.Try again. Or -Your move does not achieve anything.Try again.