Grimshaw in fairy problem 1

a) 1.Qe5! Bh6 2.Qf6+ Rf4 3.Kd2+ Ke4 4.Kc1 Rf1#

b) 1.Qxd6! Rh4 2.Qf8+ Bf4 3.Kd4+ Ke2 4.Qc5 Bb8#

After critical move of black R/B is the other black line piece B/R forced to interfere (using Maximummer for avoiding entering f4 by piece making 1st move) and the white king can then walk to desired mating square. Very good example of interplay between both sides, looking more like helpmate than a selfmate.

1.Rfc6! th. 2.Rc8#
1...Rc5 2.Qh8#
1...Bc5 2.Qe5#
(1...Bc3 2.Qxb5#)

I understand it is difficult to visualize grid board without having grid really drawn, but I decided to include this one anyway as it is always good to have an example of not too high ambitions - just simply having the theme, but otherwise only little (or nothing) more. Here Grimshaw doesn't play well together with fairy condition, in fact in 1...Rc5 variation there is no special use of grid board. In 1...Bc5 white uses the fact Bc5 cannot enter d6. The only grid use unified in both variations lies in the defence motive of defences - they exploit the fact that after 2.Rc8+ rook from c8 doesn't guard c7.

1.Se7! th. 2.Rf5#
1...Rf6 2.Kd4#
1...Bf6 2.Kc6#

Grimshaw is used in the standard way for twomover - inteferences allow access of wK to some squares and thus allow royal battery mates. But then it turns out that interfering pieces remain in some sense pinned - they cannot move due to fairy condition. Not bad.

1.Se3! Bc2 2.b4 Bb3 3.Rc4 Rc1 4.Re4! Bc4, Rc4 5.Re6#, Sxd5#

Unusual genre shows Grimshaw in the form not easily seen from the diagram - both thematical black pieces, bishop and rook, are first forced to move to the squares from which they can interfered or interfere.

1.Kf6? th. 2.Qc2#
1...Rc4 2.Qg1#
1...Bc4!

1.Kg7? th. 2.Qc2#
1...Bc4 2.Qf5#
1...Rc4!

1.Kh6! th. 2.Qc2#
1...Bc4 2.Qf5#
1...Rc4 2.Qg1#

In Bicolores the pieces check own king too. This motivates both choice of the key (white avoids selfcheck) and the exploitation of the Grimshaw (white can mate on the same type of line as is the interfering piece.

1.Rd3! zz
1...Bg7 2.Bxf5#
1...Rg7 2.Qe5#
1...Bb5 2.Sd4#
1...Rb5 2.Qd5#
(1...Kd5 2.Re3#
1...g5,R~8 2.Bxf5#
1...Bd1,Bc2,Bb3 2.Qd5#
1...Ra7,Ra6 2.Sd4#
1...Sb6 2.Rd6#)

Nice flightgiving key introduces two Grimshaws typical for patrol chess - white uses that the pawn is no longer patrolled and thus cannot capture anymore (rather than the interfered pieces).

1.Qd7? th. 2.Bd5+, Rc5+
1...b2!

1.Ke1! th. 2.Qd5+ Qxd5(Qd1) 3.Qxb3#
1...Rd7 2.Rc5+ Bxc5(Ra1) 3.Rc1#
1...Bd7 2.Bd5+ Qxd5(Bf1) 3.e3#

Nowotny try is refuted by unblocking pawn move. Thus white creates threat that takes care of the potential flight b3 and waits for black Grimshaw that is typical for Circe - blacks interferes possible capture of white pawn that would parry the check from the first row.