Commentary for black move 19: No. In the mid-1800's, Paul Morphy -- this is known as Morphy's Defense showed that after the move Qd8-d4, attacking the white knight and the e4 pawn, black advantageously regains his lost pawn. And so the move a6, the Morphy Defense, became known and became the most popular way of defending this classical king pawn opening. The retreat, Ba4. Black develops Nf6, a counterattack on the e4 pawn. White ignores it by Cassling. And again, a new juncture.

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