[Retros] Backhome proof game.

[Nicolas.Dupont at math.univ-lille1.fr]

Hi,

Because of a welcome remark by Mario Richter, I must slightly extend a
rule : A return primes a check and even more the potential capture of a
King.

Example 3 : 1.c4 d5 2.c5 d4 3.c6 d3 4.Qa4 Kd7 is a sound bpg.


> rnbq1b1r/pppppkpp/8/4P1P1/8/8/PPPP1P1P/RNBQKBNR

> PG 7.5 Backhome


(ND, France-Echecs 2008)

Detailed solution : 1.e4 f5 2.e5 f4 3.Qg4 f3 4.gxf3 (possible as Qd1 is
impossible) Nh6 ! (on the road to freedom) 5.Qh5+ (this is a check as Qd1
remains impossible) Nf7 ! (Ng8 is impossible because of the check) 6.f4
Ng5 (possible as the black King is no longer threaten by the white Queen)
7.Qd1 (only move) Kf7 (possible as the black knight is now far from home)
8.fxg5

Funny, isn't it ?

Best,

Nicolas.