Gueridon’s Mate (also called Swallow-tail Mate or Swallowtail Mate)

This mating pattern and mating net similar to the Epaulette Mate, however the blocking opposing pieces do not sandwich the opposing King and instead are located one rank behind him. While the Epaulette Mate almost always will occur with the opposing King sandwiched on a back rank (or in some rare cases on a wing), Gueridon’s Mate can occur with the opposing King more centrally located on the board. The barebones diagram below shows a couple of different positions for Gueridon’s Mate as examples. The game example below, for which the final checkmate position is Gueridon’s Mate occuring more centrally located, resulted from a trap which can occur in Philidor’s Defense that Black either forgot or unknowingly fell into while playing the game.
[Source: http://www.chesscity.com/ANALYSIS/Beginner/checkmate_patterns.htm]

 

Gueridon’s Mate-Barebones Mating Positions

DIAGRAM GM-1A
Gueridons_Mate

 

DIAGRAM GM-1B – Game Example

               
   
   
   
   
   
   
   
   
               
Click Down Arrow to Choose Auto Play Speed

            Move: 
[you may click on a move notation to the right to jump to that move]
1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 exd4 5.Nxd4 Be7 6.Bxf7+ Kxf7 7.Ne6 Kxe6 8.Qd5+ Kf6 9.Qf5#

1-0
Polo-Pasqualini, Ferrara 1923