Queens Pawn Game London System Swallowstail Mate in Chess

In the queens pawn game london system, the swallowstail mate is a specific mating pattern that arises from a London-style setup: pawns on d4 and often e3, with pieces coordinated around the dark-square complex. The defining feature is a “swallowtail” pawn/figure arrangement that restricts the enemy king’s escape squares while a heavy piece delivers the final blow.