24 February 2011

Andernach Chess

Andernach chess is a chess variant in which a piece making a capture (except kings) changes colour. Non-capturing moves are played as in orthodox chess. If a pawn captures on 8th rank, it is promoted first and then changes colour.

Andernach is the site of annual meetings of fairy chess enthusiasts. There, in 1993, this chess variant was introduced.

  1Michel Caillaud  
Christian Poisson  
Andernach TT 1993
1st Prize
[8/1Pp1P3/2Q2p2/4pPpN/2P3pr/6pk/1P4p1/6K1]
  #6(8+9)  
  Andernach chess

  2Stephen Rothwell  
  
feenschach 1997
2nd Prize
[1K6/5p2/3B1rn1/p3N3/2Bk2p1/2N2p2/2pP4/3n1b2]
  #6(6+10)  
  Andernach chess

Perfect analogous variants in Nr. 1 resulting from the different first moves of the black pawn. After the key move 1. Qe4!, there is zugzwang:
1. - c5 2. Qe1 e4 3. b8=R e3 4. Rb3 e2 5. Rxg3=b R~ 6. Qg3#
1. - c6 2. e8=B c5 3. Qe2 e4 4. Bc6 e3 5. Bxg2=b B~ 6. Qg2#

The black rook on h4 is pinned in a way that's typical for Andernach chess – capturing the knight led to a change of colour and therefore to a self-check.

Diagram 2 shows a fairy roundtrip e2-e3-f5-f4-e2. White uses each newly acquired piece to give check again: 1. Be2! (thr. 2. Nc6#) fxe2=w 2. e3+ Nxe3=w 3. Nf5+ Rxf5=w 4. Rf4+ Nxf4=w 5. Ne2+ Bxe2=w 6. Nc6#.

In most cases, Andernach chess is used in connection with helpmates. Here are two beautiful examples.

  3Torsten Linß  
Markus Manhart  
Franz Pachl  
Manfred Rittirsch  
Andernach TT 1993
1st Honourable Mention
[1K6/3q2N1/8/4k3/r1P3b1/2P5/8/3n4]
  h#2,5*(4+5)  
  Andernach chess

  4Juraj Lörinc  
  
  
  
Sachova Skladba 49/1995
  
[k7/rb2p3/4P3/1P6/6P1/7P/2P4B/RK5B]
  h#2      10.1...(9+4)  
  Andernach chess

The stipulation of Nr. 3 says that it's White to play. You also could write it as "h#3 0.1...". The asterisk tells that there is also a set play (play which is possible from the initial position of a problem if the other player moves first). Solution:
1. - - 2. Rxc4=w Ra4 2. Qxa4=w Qd4# and
1. - Nh5 2. Nxc3=w Nd1 3. Qxd1=w Qd5#.
Total analogy between set play and solution.

Nr. 4 is a task problem. Ten times the same procedure. Very neat!
1. Ra2 Rxa2=b 2. Rxc2=w Ra2#
1. Ra3 Rxa3=b 2. Rxh3=w Ra3#
1. Ra4 Rxa4=b 2. Rxg4=w Ra4#
1. Ra5 Rxa5=b 2. Rxb5=w Ra5#
1. Ra6 Rxa6=b 2. Rxe6=w Ra6#
1. Bg2 Bxg2=b 2. Bxh3=w Bg2#
1. Bf3 Bxf3=b 2. Bxg4=w Bf3#
1. Be4 Bxe4=b 2. Bxc2=w Be4#
1. Bd5 Bxd5=b 2. Bxe6=w Bd5#
1. Bc6 Bxc6=b 2. Bxb5=w Bc6#

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