(22.12.2013) Феерична задача на Карол Млинка от Словакия с интересен начин за формиране на анти-батареи при различни форми на близнаците.

a) 1.Rd3 Gd4  2.Re3 Gf2  3.Rh3 HAg3#

b) 1.Bd7 Gd8  2.Be6 HAd5  3.Bh3 HAg5#

c) 1.Rg3 Ke5  2.Kg5 Ke4  3.Kg4 HAf3#

Creation of anti-batteries (2 after switchback), selfblocks and  (chameleon) echo model

mates. (Author)

Hamster: moves like a Grasshopper but deflect 180^o on passing over the hurdle.

Haaner Chess: any already left square can not be neither occupied nor crossed.

Grasshopper: hops on Q-lines over any one unit (the hurdle) to the next square beyond.