Queens Pawn Game Modern Defense Under Promotion in Chess

In the Queens Pawn Game Modern Defense, the game often develops with Black aiming for flexible piece play after moves like 1.d4 d6 and ...g6/...Bg7. “Under promotion” here means that when a pawn reaches the last rank, you deliberately promote to a knight (or sometimes another piece) instead of a queen to create an immediate tactical effect. The defining feature is that the promotion choice is forced by the position—often because a queen would be captured or would block a critical line.