PG 3.5 Andernach*, Breton Adverse**, Extinction***
* Andernach chess is a chess variant in which a piece making a capture (except kings) changes colour. ** When a piece is captured, another piece of same nature belonging to captured side (if any) must also disappear.
*** A side is in check if it is threatened to no more have a kind of piece it owned in the diagram position. Promotions to King are allowed.
Sol. 1.e3 Sc6 2.Bb5+ Se5 3.Qh5+ g5 4.f4#