[Retros] Champagne 2005 : announcement

[CAILLAUDM at aol.com]

Theme
Proof Games with reciprocal interferences (a piece A interferes  with a piece 
B and the piece B interferes with the piece A). "The piece A  interferes with 
the piece B" means that the piece A moves to a vacant square, so  that if A 
were not there, at some time of the solution, B could capture the  opposite 
King.
 
The interferences may occur in the same phase (a single solution), or in  
different phases (two solutions or twins).
The pieces A and B can be of the  same or different color.
A pawn before and after promotion is considered as  the same piece.
Extensions to closed cycles (A interferes with B, B  interferes with C, C 
interferes with A, etc.) are allowed.
 
Additional notes
Fairy proof games are allowed
Only 1.0  non-computer-tested entry per composer is allowed
(a problem with three  co-authors counts as 0.33 entry per composer)
 
Example I
Michel Caillaud, original (Eretria  2005)
rnbqkbnr/2p1ppp1/8/3p4/8/2P5/PPQPPPPP/R3KBNR
SPG 9.0 (14+13)  C+
1.c3 d5 2.Da4+ Dd7 3.Dxa7 Df5 4.Dxb7 Dxb1 5.Db3  Dxc1+ 6.Dd1 Dc2 7.Db1 Da4 
8.Dxh7 Dd7 9.Dc2 Dd8
 
Example II
possibly the historical first reciprocal interference in  ProofGame?
Thierry Le Gleuher, Phenix 1995  
2b1kb1r/pp1ppppp/2p5/6R1/Q5BB/1KP1PN2/1PPNRPPP/7Q 
SPG 23.5 (16+12)  C+
1.a4 c6 2.a5 Db6 3.axb6 Sa6 4.Ta5 Sc7 5.bxc7 Tb8 6.cxb8=D Sf6 7.Df4 Sd5  
8.Da4 Sc3 9.dxc3 Kd8 10.Kd2 Kc7 11.Kd3 Kd6 12.Kc4+ Ke6 13.Kb3 Kf6  14.Lg5+ Kg6 
15.Sd2 Kh5 16.Lh4+ Kh6 17.e3 Kg6  18.Tg5+ Kf6 19.Le2 Ke6 20.Lg4+ Kd6 21.Sgf3 Kc7 
22.Te1  Kd8 23.Te2 Ke8 24.Dh1
 
Prizes in bottles of French Champagne (for people being in Eretria...; only  
glory for those not being there...)
 
Entries to the judge Michel Caillaud :
1. via e-mail (_CAILLAUDM at aol.com_ (mailto:CAILLAUDM at aol.com) ) by 1st of 
September at  the latest
2. during the congress 
a) Non-computer-tested problems, by  Tuesday, 6 September, 20:00
(only corrections of already entered and cooked  compositions will be 
accepted during the last day!)
b) Computer-tested  problems, by Wednesday, 7 September, 20:00.
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