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5.Bc4 Bg4 6.f3: the retreat, then …c5

Against 5.Bc4, you play 5…Bg4 in 18 games, for 44%. The move is good; the engine even prefers it to 5…Bf5. It's what comes next that goes wrong.

Recall: in the 6.Bd3 line, when do you play …c6?