27 July 2012

This and that

What a heat! I will just write a few lines, show you two chess problems and take a cold shower (again).

In an earlier post I've mentioned my intention to compose a moremover demonstrating a king march from one corner of the board to another. In the meantime I've found the following chess problem. It can be so easy, right?

  1Helmut Klug  
Manfred Zucker  
Freie Presse, 1971
Weihnachts- und Neujahrsgruß
[K7/P7/8/rp6/rp1N4/kB6/2P5/B1bN4]
  #8(7+6)  

It's no big deal figuring out the solution: 1. Kb8! Bf4+ 2. Kc8 Bc1 3. Kd8 Bg5+ 4. Ke8 Bc1 5. Kf8 Bh6+ 6. Kg8 Bc1 7. Kh8 R~ / B~ 8. Nxb5 / Bb2#. Hats off to the composers who mastered this theme with only 13 chessmen!

The second composition is one of those I've already written about here and here. But something is different here. That's why I don't reveal the solution at once and challenge you to find out where the crux lies. It's not that difficult, I promise.

  2Andrej N. Frolkin  
Internet, 2011
[7k/7p/P6p/P6p/P6p/P6p/P7/K7]
Add the missing unit(s) (6+6)

Show/Hide solution

20 July 2012

Black or White or ?

This is the last part of the series. Maybe you enjoyed it at least a bit, maybe you've been waiting impatiently for a change of the subject.

What else is there to show that makes me write another post about colour changes? Well, so far, we've seen pieces be a) white or b) black. But another phase c) could be to remove the piece. Look what I have found.

  1Christopher John Feather  
Black to play, 1994
[6nB/5pQK/7p/4r3/r3pk2/8/4p3/8]
  h#2(3+8)  
a) Diagram
b) wPe4
c) -bPe4

  2Hans Peter Rehm  
problem 09/1966
[3n4/q2pr3/1n1kP3/P2B2p1/3B2r1/PR1P1p2/KP2PP2/8]
  h#2(11+9)  
a) Diagram
b) bBd4
c) bBd4, bBd5
d) bBd5
e) -wBd5
f) -wBd4
g) -wBd4, bBd5
h) -wBd5, bBd4
i) -wBd4, -wBd5
Solutions
1a) 1. Ke3 Qxe5 2. Kd3 Qc3#
b) 1. Rh5 Qc3 2. Kg5 Qg3#
c) 1. Kf5 Qg3 2. Rg4 Qxe5#
If you examine the white moves you'll see that they are cyclic. Very nice composition!
2a) 1. Nc8 Bxa7 2. Kc7 Bb8#
b) 1. Kc5 a4 2. d6 Rb5#
c) 1. Nc4 Rb6+ 2. Kc5 b4#
d) 1. Bc6 Rb5 2. Nxe6 Be5#
e) 1. Kxe6 Rxb6+ 2. Kf5 Rf6#
f) 1. Ke5 d4+ 2. Kf4 Rxf3#
g) 1. Kc5 d4+ 2. Kc4 Rb4#
h) 1. Kc5 Rxb6 2. d5 b4#
i) 1. Ke5 Rb5+ 2. Kf4 e3#
We see all possible combinations of the bishops on d4 and d5 being white, black or absent. Wow!

The third phase c) in the final four chess problems uses a neutral piece, another great idea. We get to see eleven model model mates.

  3Jorge Joaquin Lois  
Problemas 10-12/1981
dedicated to R. Candela Sanz
[8/8/kb6/5K2/1P2PQ2/8/8/8]
  h#2(4+2)  
a) Diagram
b) bPb4
c) nPb4

  4Michel Caillaud  
Phenix 07-08/2002
 
[5N1N/4K3/6Pp/7k/8/7B/5B2/8]
  h#2(6+2)  
a) Diagram
b) bNh8
c) nNh8

  5Kjell Widlert  
  
Springaren 05/1998
[4K3/b7/1P6/Nk6/rbNP4/p2P4/8/7B]
  h#2(7+5)  
a) Diagram
b) bBh1
c) nBh1

  6Pieter Barend van Dalfsen  
Albertus Marinus Koldijk  
Probleemblad 1997
[8/8/8/8/6Pn/8/3NK1kb/6R1]
  h#2(4+3)  
a) Diagram
b) bRg1
c) nRg1
Solutions
3a) 1. Bd8 Qb8 2. Ba5 b5#
b) 1. Kb5 Qd2 2. Kc5 Qd5#
c) 1. nPb3 e5 2. Ka5 Qa4#
4a) 1. Kg5 Bg3 2. h5 Nf7#
b) 1. Nf7 Ne6 2. Ng5 Nf4#
c) 1. nNxg6+ nNf4+ 2. Kg5 Ne6#
5a) 1. Rxa5 Kd7 2. Ra6 Bc6#
b) 1. Bb7 Nc6 2. Ba6 Nxa7#
c) 1. nBa8 Nb7 2. Kc6 Nd6#
6a) 1. Kh3 Nf1 2. Bg3 Rxg3#
b) 1. Kh1 Ne4 2. Ng2 Nf2#
c) 1. Kh3 Ne4 2. nRxg4 Nf2#

13 July 2012

Black or White (6)

Now that we're through with colour changes of each of the five different piece types, we want to have a look at some examples that show a combination of that motif.

In the first two chess problems the changes are done separately, the other two demonstrate consecutive changes.

  1Ralf Krätschmer  
mpk-Blätter 12/2011
Commendation
[8/1B2p3/1rN2p2/1p1kB2R/2p1p3/8/5PK1/8]
  h#2(6+7)  
a) Diagram
b) bBe5
c) bRh5
d) bNc6
e) bBb7

  2Rolf Wiehagen  
Christer Jonsson  
Springaren 09/2009
[q7/3P4/2p5/4R3/p2k4/2n2N2/1N6/7K]
  h#2(4+6)  
a) Diagram
b) bPd7
c) bRe5
d) wNc4

  3G. Bakcsi jr.  
Laszlo Zoltan  
Umenie 64, 1996
[8/8/8/3Npk1P/2R5/B2P4/B3P3/1b3K1n]
  h#2(8+4)  
a) Diagram
b) bRc4
c) further bNd5

  4Wiktor J. Abrossimow  
Schachmatnaja Poesija, 2006
3rd Honourable Mention
[5b2/4r3/2b1P3/3nk3/8/KN2N3/5p2/3R4]
  h#2(5+6)  
a) Diagram
b) wBc6
c) further bNe3
d) further wNd5

Solutions
1a) 1. Ke6 Rh7 2. Kd7 Rxe7#
b) 1. Ke6 Nb8 2. Bd6 Bd5#
c) 1. Kc5 Bc3 2. Rd5 Bb4#
d) 1. Ke6 Rh8 2. Kd7 Bc8#
e) 1. e3 Nb4+ 2. Ke4 f3#
2a) 1. Qa5 d8=N 2. Qc3 Nxc6#
b) 1. d5 Re3 2. c5 Nc2#
c) 1. Rb5 d8=Q+ 2. Kc5 Nd3#
d) 1. b1=N Nb2 2. Nc3 Nf3#
3a) 1. Ke6 Rc8 2. Kd7 Nb6#
b) 1. Nf2 Be7 2. Rf4 Ne3#
c) 1. Rg4 Be7 2. Nf4 e4#
4a) 1. Kd6 Re1 2. Rc7 Nf5#
b) 1. Nc7 Bd5 2. Kd6 Nc4#
c) 1. Nf4 Rd5+ 2. Ke4 Nd2#
d) 1. Ke4 Rc1 2. Kd3 Nf4#

06 July 2012

Black or White (5)

Finally, no surprise, there are the pawns that change colours. As I've found so many examples, I selected the miniatures that have no captures and end with ideal mates.

  1Nikolai O. Dolginowitsch  
Ideal-Mate Review 01-03/1996
Commendation
8/1p6/1k6/8/PN6/3K2B1/8/8
  h#2(4+2)  
a) Diagram
b) bPa4

  2Tode Ilievski  
Ideal-Mate Review 10-12/1997
Commendation
[8/8/K7/8/1pkP1N2/3R4/2n5/8]
  h#2(4+3)  
a) Diagram
b) bPd4

  3Tode Ilievski  
Ideal-Mate Review 07-09/1998
Commendation
8/8/3K4/8/B1k5/2P5/4n3/2R5
  h#2(4+2)  
a) Diagram
b) bPc3

  4Anatoli W. Stjopotschkin  
Schachmatnaja Poesija 2007
  
[8/7K/8/5kp1/R7/8/2N5/b3r3]
  h#2(3+4)  
a) Diagram
b) wPg5

I already indicated in the previous post that there is much more you can do with this colour change effect — you'll see in the following weeks.

Solutions
1a) 1. Kc5 Bh4 2. b6 Be7#
b) 1. Ka5 Kc3 2. b5 Bc7#
2a) 1. Ne3 Ng6 2. Nd5 Ne5#
b) 1. Na1 Rd2 2. Nb3 Rc2#
3a) 1. Nd4 Bd1 2. Nb3 Be2#
b) 1. Nf4 Re1 2. Nd3 Re4#
Observe the move patterns: N-B-N-B and N-R-N-R. Maybe just a coincidence, still nice.
4a) 1. Bf6 Rh4 2. Re5 Nd4#
b) 1. Re6 Rg4 2. Be5 Ne3#