Fairy helpmates with echo diagonal-orthogonal 2

a) 1.VAg4 LEf2 2.Kf5 MAf3#

b) 1.PAc6 LEb3 2.Ke6 MAc4#

Some elements are well matched, some are unique. E.g. there is not anything like blocking of VAg4 in the b) position. But the critical moves of wLE and antibattery mates are OK.

1.Rh3 Bxc4 2.Qh5 Rxd6#

1.Bg4 Rxd6 2.Qf3 Bxc4#

Inversion of white moves has Madrasi motivation. Paralysing neutralisations of mating checks is impossible due to unparalysing of the other white line piece.

a) 1.Sc3 Sd6 2.Sxc6 Sdf7#

b) 1.Se2 Sc6 2.Sxd6 S6a5#

Although both sides play only with knights, there is very strong D-O analogy of position. Pinning and unpinning on both sides of bK are typical for locusts.

1.Qxg3 Gc5+ 2.Kc3 Gc1#

1.Qxg1 Gc3+ 2.Kc5 Gf8#

Black queen must open D-O line for one of Gg1, Gg3 pair, but she mustn't pin Gf4, that's why she captures grasshopper playing in the other solution in W1. Then bK walks intomating nets and white gives O-D mate.

a) 1.Bxd2(w) Sc7 2.Qg4 Bb4#

b) 1.Rxg3(w) Sd7 2.Qc2 Rg6#

B1 change rear pieces of O-D white masked batteries, but opens O-D black guard lines of D-O mates. That's why in B2 Black makes very long anti-Bristol O-D moves by bQ. Fine analogy with quite strong white material for Andernach helpmate.

1.Kd1 Sf6 2.Sc2+ Se4 3.Qc1 Sc3#

1.Ke1 Se5 2.Se2+ CGd4 3.Qf1 Sd3#

Less usual form of echo diagonal-orthogonal. There are no signs of it in the initial position, however there are more its elements during the play than you would expect! B1 is D-O move of bK, B2 sets bS on the O-D line leading from 1st row to potential mating square, B3 is blocking D-O move of bQ, W3 is mating move activating indirect D-O antibattery.

1...Bd4 2.Qxd4 Gh8 3.Qd2 Rc3#

1...Re3 2.Qxe3 Gg3 3.Qc1 Bc3#

White has to evacuate D-O lines, but there is only one such way. He must sacrifice his B-R, then there are O-D G moves. Black queen makes O-D move and White mates by R-B, activating D-O antibattery.

1.Bc6 Rdd5 2.Rxf8 Bg6#

1.Rc6 Bc5 2.Bxd7 Rg6#

Very strong D-O analogy and colourful Mars Circe play.