Examples for 37th TT CCM C 9.9.2015

Let's face it: CCM was recently slightly abandonded as a result of my involvement with the official page of Slovak Organization of Chess Composition. That is also why the promised examples for our 37th TT CCM are so late. Due to demand I have decided to prepare at least one batch and it was not particularly difficult as there are in fact hundreds of examples in existence. So let's have a look on direct mates where white king play actively after being checked.
John Driver
Comm The British Chess Magazine 1967

1.Sf8! th. 2.Rxd7#
1...cd4+ 2.Kxe3#
1...ed4+ 2.Kxc3#
1...Se4 2.bd4#
1...Sc4 2.fd4#
1...d6 2.Sf6#
1...Ra6,Ra7,Sb5 2.Rxc5#
1...Rh6,Rh7,Sf5 2.Rxe5#

Two thematical variations combine multiple effects. Black berolinas defend by checking, with the following errors: opening of rooks to c4/e4, provision of hurdle on d4 for Gd2. Then White can fire royal battery over immobilized berolina on d4.

Of course there is symmetry of all variations except 1...d6.









#2 (10+8)
1+0 grasshopper, 2+2 berolina
Raffi Ruppin
Comm B. Formanek 70 JT 2003-04

1.Qa5! th. 2.Qxc5#
1...Qxh2+,Qd5+ 2.K(x)d5#
1...Qxc6+ 2.Ke5#
1...Rxe6+ 2.Kxc5#
1...Rf5 2.Rd2#
1...Rb5 2.Qd2#
1...Sab3 2.Se2#

As both kings have different movement here, wK can check black rS directly. While Kd5+ is possible only after unguard of d5, two other checks can follow only after blocking of c6 and e6 respectively.









#2 (8+10)
royal knight d4
Charles E. Kemp
The Problemist Fairy Chess Supplement 1932

1.Na2! zz
1...rSe2+ 2.Ke3#
1...rSe6+ 2.Ke5#

Main point of this wenigsteiner is asymmetry: While 1.Na2 solves, 1.Na6? is refuted by 1...rSe6+! The crucial difference is in the guarding of d8 and f8 from a2.









#2 (3+1)
Vertical cylindric board
nightrider b4, royal knight d4
Gerhard Maleika
2nd HM Phénix 1995

1.Rc6! zz
1...Kd3+ 2.Kb3=
1...Kd5+ 2.Kb5=
1...Rxf4 2.gxf4=
1...Rd4 2.Bxd4=
1...Re3 2.Bxe3=
1...Re2 2.Rxe2=
1...Re1 2.Bxe1=
1...Re5 2.fxe5=
1...Rxe6 2.Rxe6=

The key gives two flights d3 and d5. Moves of bK to these squares mean firing royal battery, however wK moves using the same vector as bK and stalemates it. Moves of bR mean opening of white lines to both flights so that White just needs to capture bR.









=2 (12+5)
Jan Mortensen
549 Rex Multiplex 17 - I 1986

1.Qb8! th. 2.Qa8#
1...GNf4+ 2.Kf7 th. 3.Qa8#
1...GNh4+ 2.Kh7 th. 3.Qa8#
1...GNf3+ 2.Kf6 th. 3.Qa8#
1...GNh3+ 2.Kh6 th. 3.Qa8#

This threemoves is not about checkmates - there is only one and quite banal Qa8#. But this is an interesting study of gnu movement geometry: after four checks wK exploits the fact that (0,3) is the single simple and relatively small vector that gnu cannot make in two moves.









#3 (2+5)
gnu g1
Hans Peter Rehm
Die Schwalbe 1978

1.Kc8? th. 2.Sc7#
1...Rg8+!

1.Kc6! th. 2.Sc7# nBg2+ 2.f3 th. 3.Sc7# nBxf3+ 3.Kc7+ nBg4 4.Kc8 nRh8+ 5.Sf8 th. 6.Sc7# nRxf8+ 6.Kc7#

White insists for a long time on the threat Sc7#. The only defences of Black are checking moves by neutral pieces. Neutral bishop has to be steered to g4 first to eliminate strong defence x...Rg8! Then White can force neutral rook to defend on the 8th rank, finishing black by checkmate from the second royal battery.









#6 (5+8+2)
2 neutral pieces

Comments to Juraj Lörinc.
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