Mates by neutral units 1

1.Bf5! th. 2.nQxc6(nPc7)#
1...nQh7 2.nRxe1(nRh8)#
1...nQa7 2.nRxe2(nRa8)#
1...nRe6 2.nSxe6(nRa8)#
1...nRe7 2.nQxe7(nRh8)#
1...nSe4 2.nSxc3(nPc7)#
1...nQf7 2.nQxc4(nPc7)#
1...nQg7 2.nQxc3(nPc7)#
1...nQxc6(nPc2) 2.nRxc2(nPc7)#

Irreversibility of the mating move is ensured by the capture of a neutral unit, reborn somewhere on the 7th or 8th rank. Pawn from c7 or rooks from a8 or h8 check and cannot move away.

a) 1...c8nN 2.Ke5 dxc8nZ(nNc1)#

b) 1...c8nNE 2.Kxg5(nNg8) dxc8nAN(nNEc1)#

Mating moves in this helpmate consists of two irreversible elements - promotions of pawn and rebirth of captured unit. Any of these might move away if it was not the double check. There is a flaw in the position, pity that nANh2 does not take any part in the b) position, bK is mated too close to it. Fiary AUW.

a)
1...nGg1 2.nGe1 nGxb4#
1.nGg1 nGe1 2.fxe1nG nGxb4#

b)
1...nNg2 2.nNe1 nNexc2#
1.nNg2 nNe1 2.fxe1nN nNexc2#

One of very sophisticated problems with neutral units. In the set play thematical neutral piece runs to the mating square where it mates as it becomes pinned. However the point lies in the absence of waiting move for Black - so he starts the same way, White then follows - moves change the colour. In the second black move, possible waiting move appears. And it is immediate phenix - neutral pawn promotes just into the piece it has right now captured. Well done.

1.nBxb4(nBf8) nRxg7(nRa1) 2.nKc3 h7 3.nBg6 h8nB#

1.nSf1 g8nB 2.nBxh7(nBc8) nKc4 3.nKxb4(nKe8) nSxg3(nSg1)#

1.nBh4 b8nB 2.nBbxg3(nBf8) g5 3.nKc3+ nKxb4(nKe1)#

Neutral king with all other pieces neutral too can be checked by pawns only as otherwise it would be selfcheck. Yes, this is true only under orthodox rules. However in Anticirce it is possible to arrange checking by other units too, it is just necessary to block respective rebirth squares. Here we see 3 such mates, attained by three different ways. In the first there is usual promotion, in the second white moves away nS from the Circe square of checking bishop, this move beeing capture and thus irreversible. In the third solution we see capture by nK, transporting him directly into the middle of a mating net.

1.d2 nEh8 2.Ke5 g4 3.nEg6 d4#

1.Kf5 nSd2 2.Kf4 nEh4 3.nSfe4 g4#

Less usual move that cannot be taken back: double step of mating pawn. Once he mates directly and cannot move 1 square back beacuse of the antibattery, once he moves into antibattery and cannot retreat at least one square because of direct check. Thematical use of equihoppers.

a) 1...nSg4 2.f5 nKg6+ 3.nKh7 nBd4 4.g5 fxg6 e.p.#

b) 1...nQb8 2.nKf6+ nKe7 3.g5 nBh4 4.f5 gxf6 e.p.#

And finally another problem with neutrals only. Here the mating moves are e.p. captures, both are at the same time moves along pin lines.