Nº4 Marc Gelly

Win

Marc Gelly (France)

wKb2,Ne3,Bg1,Pc4,f2,g3/bKa4,Pa5,b4,c5,d4,e4,f5,g4,g7

1.f4!!
1.Nd5? b3 2.f4 e3! =
1.f3? d×Ne3 2.f×e4 e2 3.Bf2 f×e4 4.Be1 =
TRY 1.N×f5? b3! 2.f3 e3! 3.N×e3 d×e3 4.B×e3 Kb4 =

1…b3!
1…d3 2.Nd5 b3 3.B×ç5 d2 4.Nb6 #
1…d×e3 2.B×e3 +-
1…g×f3 ep 2.Nd5 b3 3.Bf2 #2

2.Bf2!! Play for zugzwang.
2.Nd5? e3 =

2…d×e3
2…d3 3.Be1 #3

3.Be1!
3.B×e3? Kb4 -+

3…g6 4.Bç3! Zugzwang 4…g5 5.f×g5 f4 6.g6 f3 7.g7 f2 8.g8Q f1Q 9.Qe8 #

THEME. The Key move affronts bravely a double obstruction «en passant».Zugzwang for P-promotion with double N-sacrifice (passif).