[Retros] =N double checkmates

[Hirokaz ONODA]

Hi,

Finally, no vacant room is left now.


=N double checkmates, SPG

[bN] 10.b8N# (Hirokaz Onoda, 2007)
[cN] 9.c8N# (Hirokaz Onoda, 2006)
[dN] 9.d8N# (Roberto Osorio, 2007)
[eN] 9.e8N# (Paul Raican, 1996)
[fN] 10.f8N# (Noam D. Elkies, 2006)
[gN] 9.g8N# (Roberto Osorio, 2007)

[baN] 7.bxa8N# (Hirokaz Onoda, 2006)
[abN] 11...axb1N# (Hirokaz Onoda, 2007)
[cbN] 7.cxb8N# (Hirokaz Onoda, 2007)
[bcN] 10.bxc8N# (Hirokaz Onoda, 2007)
[dcN] 7...dxc1N# (Olli Heimo, 2006)
[cdN] 9.cxd8N# (Hirokaz Onoda, 2007)
[edN] 7.exd8N# (Joerg Varnholt, 1996)
[deN] 10.dxe8N# (Hirokaz Onoda, 2006)
[feN] 8.fxe8N# (Hirokaz Onoda, 2007)
[efN] 7...exf1N# (Hirokaz Onoda, 2007)
[gfN] 9.gxf8N# (Hirokaz Onoda, 2007)
[fgN] 8...fxg1N# (Hirokaz Onoda, 2007)
[hgN] 9...hxg1N# (Hirokaz Onoda, 2007)
[ghN] 8.gxh8N# (Olli Heimo 1996)


1.a4 Nc6 2.a5 Nd4 3.a6 Nxe2 4.axb7 Nd4 5.Rxa7 Nxc2 6.Qxc2 d5 7.Qxc7 d4
8.Qb6 Kd7 9.Kd1 Qe8 10.b8N# (Hirokaz Onoda, 2007)
1.d4 e6 2.d5 Qf6 3.d6 Ne7 4.dxc7 d5 5.Qxd5 Bd7 6.Qxb7 Nd5 7.Bd2 Ke7 8.Ba5
Be8 9.c8N# (Hirokaz Onoda, 2006)
1.d4 e5 2.d5 Qf6 3.d6 Qf3 4.exf3 f6 5.Bb5 Kf7 6.Bxd7 Nc6 7.Bxc8 Nce7 8.d7
Ke6 9.d8N# (Roberto Osorio, 2007)
1.d4 g6 2.d5 Bg7 3.d6 Kf8 4.Qd5 Bd4 5.Bg5 Kg7 6.Bxe7 Qf8 7.Bd8 Ne7 8.dxe7
Kf6 9.e8N# (Paul Raican, 1996)
1.d4 f6 2.d5 Kf7 3.d6 Kg6 4.de d5 5.e4 Bf5 6.e5 Nd7 7.ef6 Rb8 8.f7 Ngf6
9.e8=Q Bc5 10.f8N# (Noam D. Elkies, 2006)
1.h4 f5 2.h5 f4 3.h6 f3 4.hxg7 fxe2 5.Rxh7 exf1N 6.Qg4 e5 7.Qg6 Ke7 8.g4
Nh6 9.g8N# (Roberto Osorio, 2007)

1.c4 e6 2.c5 Ke7 3.c6 Kd6 4.cxb7 c6 5.Qa4 Kc7 6.Qxa7 Bd6 7.bxa8N# (Hirokaz
Onoda, 2006)
1.a4 b5 2.Ra3 bxa4 3.Rb3 a3 4.Rb6 cxb6 5.c3 Qc7 6.Qa4 Qc4 7.Kd1 Qa2 8.Kc2
Qa1 9.Kb3 a2 10.Ka3 a5 11.Qb3 axb1N# (Hirokaz Onoda, 2007)
1.d4 e6 2.d5 Bc5 3.d6 Ne7 4.dxc7 d6 5.Qd5 Kd7 6.Qxb7 Re8 7.cxb8N# (Hirokaz
Onoda, 2007)
1.c3 e6 2.Qa4 Bc5 3.Qxa7 d6 4.Qxb8 Ra5 5.a4 Rb5 6.a5 Kd7 7.a6 Kc6 8.axb7
Kb6 9.Ra8 c6 10.bxc8N# (Hirokaz Onoda, 2007)
1.e3 d5 2.Bc4 dxc4 3.Nf3 Qd3 4.Rf1 Qxc2 5.Ke2 c3 6.Qe1 cxd2 7.Nc3 dxc1N#
(Olli Heimo, 2006)
1.d4 b6 2.d5 Ba6 3.d6 Bxe2 4.dxc7 d6 5.Nxe2 Kd7 6.Nd4 Kc8 7.Qg4 Kb7 8.Qd7
e6 9.cxd8N# (Hirokaz Onoda, 2007)
1.d4 b5 2.d5 Bb7 3.d6 Be4 4.dxe7 Bg6 5.e4 f6 6.Qxd7+ Kf7 7.exd8N# (Joerg
Varnholt 1996)
1.e4 c6 2.e5 Qb6 3.e6 Kd8 4.exd7 e6 5.a3 Bxa3 6.Qf3 Ne7 7.Qxa3 Ng6 8.Qe7
Kc7 9.Ra6 Re8 10.dxe8N# (Hirokaz Onoda, 2006)
1.e4 g6 2.e5 Bh6 3.e6 Bxd2 4.Qxd2 Kf8 5.Qxd7 Kg7 6.Qxe7 Bd7 7.exf7 Be8
8.fxe8N# (Hirokaz Onoda, 2007)
1.h4 d5 2.Rh3 d4 3.Rc3 d3 4.Nf3 dxe2 5.d3 Qd4 6.Kd2 Qxf2 7.Ne1 exf1N#
(Hirokaz Onoda, 2007)
1.h4 d6 2.h5 Bf5 3.h6 Bxc2 4.hxg7 Bf5 5.d3 f6 6.Nd2 Kf7 7.Qb3 Kg6 8.Qxg8 e6
9.gxf8N# (Hirokaz Onoda, 2007)
1.d3 g5 2.Bf4 g4 3.Bxc7 g3 4.Ba5 Qc7 5.e3 gxf2 6.Ke2 Qxh2 7.Be1 Qxg2 8.c3
fxg1N# (Hirokaz Onoda, 2007)
1.h4 g5 2.Rh3 gxh4 3.Rc3 h3 4.Rxc7 Qxc7 5.f3 Qh2 6.Kf2 Qh1 7.Kg3 h2 8.Kh3
h5 9.g3 hxg1N# (Hirokaz Onoda, 2007)
1.h4 d5 2.h5 d4 3.h6 Qd5 4.hxg7 Qxg2 5.Rxh7 Qh1 6.Bh3 f6 7.Bd7+ Kf7
8.gxh8N# (Olli Heimo 1996)


Amici Sumus,
Hiro


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