[Retros] Shortest Knight Double Checkmates: Summary of mid-January

[Hirokaz ONODA]

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Shortest Knight Double Checkmates
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Summary of mid-January


(As for Double Checkmates at the moment of promotion, see Pawn Mates)


--- Knight to the 8th rank ---

[Na8] 1.a4 c6 2.a5 Qb6 3.axb6 a6 4.Rxa6 Ra7 5.bxa7 e6 6.a8N Bb4 7.Nb6 Bxd2
8.Bxd2 Kd8 9.Ba5 Kc7 10.Na8# (Hirokaz Onoda, 2007)

[Nb8] 1.e4 d5 2.exd5 Nc6 3.dxc6 e6 4.cxb7 Bd6 5.b8N Ne7 6.Nc6 Kd7 7.Bb5 Re8
8.Nb8# (Hirokaz Onoda, 2007)

[Nc8] 1.c4 e6 2.c5 Be7 3.c6 Bf6 4.cxb7 Nc6 5.bxc8N Rb8 6.Nd6 Ke7 7.Qc2 Qe8
8.Qc5 Nd8 9.Nc8# (Hirokaz Onoda, 2007)

[Nd8] 1.e4 Nf6 2.e5 Nh5 3.e6 f6 4.exd7 Kf7 5.Qg4 Qe8 6.d8N Kg8 7.Ne6 Kf7
8.Bc4 Rg8 9.Nd8# (Hirokaz Onoda, 2007)

[Ne8] 1.d4 g6 2.d5 Bh6 3.d6 Kf8 4.dxe7 Kg7 5.e8N Kf8 6.Nf6 Kg7 7.Qd4 Qf8
8.Ne8# (Hirokaz Onoda, 2007)
{without promotion: 1.Nf3 g6 2.Ne5 Bh6 3.Nxd7 Bxd2 4.Bxd2 c6 5.Nf6 Kf8
6.Bc3 Kg7 7.Qd2 Qf8 8.Ne8# (Hirokaz Onoda, 2007)}

[Nf8/...Nf1] vacant

[Ng8] 1.d4 e5 2.dxe5 Nf6 3.exf6 d6 4.fxg7 Be6 5.g8N Nd7 6.Nf6 Ke7 7.Bg5 Qe8
8.Ng8# (Hirokaz Onoda, 2007)

[Nh8] 1.Nf3 e5 2.Nxe5 Qe7 3.Ng6 Qxe2 4.Bxe2 h5 5.Bxh5 f6 6.Qe2 Kf7 7.Nxh8#
(Hirokaz Onoda, 2007)


--- Knight to the 7th rank ---

[Na7/...Na2] vacant

[Nb7/...Nb2] vacant

[...Nc2] 1.d4 Nf6 2.Bf4 Nd5 3.Bxc7 Nb4 4.Bxb8 Qa5 5.Bc7 Nxc2# (Francois
Labelle, 2004)
[Nc7] invisible: 1.f4 Nf6 2.f5 Ne4 3.f6 Nxd2 4.fxe7 Nxb1 5.exf8N Nc3 6.Ne6
Nxe2 7.Qxe2 Rf8 8.Nxc7# (Hirokaz Onoda, 2007)

[...Nd2] 1.e4 Nc6 2.e5 Nxe5 3.Bb5 Nc4 4.Bxd7 Bxd7 5.Kf1 Bb5 6.Qe1 Nxd2#
(Hirokaz Onoda, 2007)

[...Ne2] 1.d4 Nf6 2.d5 Nxd5 3.Bg5 Nf4 4.Bxe7 Bxe7 5.Kd2 Bg5 6.Kc1 Nxe2#
(Hirokaz Onoda, 2007)

[...Nf2] 1.g3 Nf6 2.Bh3 Ne4 3.Bxd7 Bxd7 4.Nh3 Bc6 5.O-O Qd7 6.Kh1 Kd8 7.Rg1
Nxf2# (Hirokaz Onoda, 2007)

[Ng7] invisible: 1.f4 Nf6 2.f5 Ne4 3.f6 Nxd2 4.fxe7 Nxb1 5.exf8N Nc3 6.Ne6
Nxe2 7.Qxe2 Rf8 8.Nxg7# (Hirokaz Onoda, 2007)

[Nh7/...Nh2] vacant


--- Knight to the 6th rank ---

[Na6/...Na3] vacant

[...Nb3] 1.a4 Nc6 2.a5 Nxa5 3.d3 c6 4.Bg5 Qb6 5.Kd2 Nc4 6.Kc1 Nd2 7.f4 Qe3
8.Nf3 Nb3# (Hirokaz Onoda, 2007)
         invisible: 1.d3 e5 2.Bf4 exf4 3.Kd2 f3 4.Kc1 fxg2 5.Nf3 gxf1N
6.Rg1 Nd2 7.Rxg7 Qg5 8.Rxg8 Nb3# (Hirokaz Onoda, 2007)

[Nc6] captureless: 1.Nc3 e6 2.Nd5 Qe7 3.c3 Kd8 4.Qa4 Qe8 5.Ne7 Nc6 6.Qh4
Ne5 7.Nc6# (Hirokaz Onoda, 2007)

[...Nd3] 1.d4 Nf6 2.Bf4 Nd5 3.Bxc7 Nb4 4.Bxb8 Qa5 5.Bc7 Nd3# (Francois
Labelle, 2004)
[Nd6] 1.e3 d6 2.Qh5 Bh3 3.Nxh3 g5 4.Nxg5 Nf6 5.Nxf7 Nfd7 6.Nxd6# (Noam D.
Elkies, 1996)

[...Ne3] 1.e3 Nh6 2.Bb5 Nf5 3.Bxd7 Qxd7 4.Ke2 Qd6 5.Kf3 Qxh2 6.Kg4 e5 7.Nf3
Be7 8.Rg1 Nxe3# (Hirokaz Onoda, 2007)

[...Nf3] 1.d3 Nf6 2.Bf4 Ne4 3.Bxc7 Nd2 4.Bd6 Qa5 5.Bc5 Nf3# (Noam D.
Elkies, May 1996)
      captureless: 1.Nf3 Nc6 2.Ne5 Nd4 3.Nc4 e5 4.f4 Qf6 5.Kf2 Qb6 6.Kg1
Nf3# (Unto Heinonen, 1996)
[Nf6] captureless: 1.Nf3 d5 2.Ne5 Bf5 3.Nd7 e5 4.c3 Ne7 5.Qa4 Rg8 6.Nf6#
(Goeran Wicklund, 1996)

[...Ng3] 1.g3 Nf6 2.Bh3 Ne4 3.Bxd7 Bxd7 4.Nh3 Bc6 5.O-O Qd7 6.Kh1 Kd8 7.Rg1
Nxg3 (Hirokaz Onoda, 2007)
[Ng6] invisible: 1.d4 b5 2.d5 b4 3.d6 b3 4.dxe7 bxc2 5.exf8N cxb1B 6.Ng6
Bf5 7.Ne7 Kf8 8.Qd6 Qe8 9.Ng6# (Hirokaz Onoda, 2007)

[Nh6] 1.d4 Nf6 2.d5 Nh5 3.d6 f6 4.dxe7 Kf7 5.exd8N Kg8 6.Nf7 d6 7.Qd5 Nd7
8.Nh6# (Hirokaz Onoda, 2007)


--- Knight to the 5th rank ---

[Na5/...Na4] vacant

[...Nb4] 1.e3 a6 2.Bxa6 Ra7 3.Bb5 Na6 4.Bxd7 Bxd7 5.d3 Be6 6.Kd2 Bxa2 7.Kc3
Bxb1 8.Kb3 Bxc2 9.Ka2 Nb4# (Hirokaz Onoda, 2007)

[Nc5] captureless: 1.d3 d6 2.Nd2 Kd7 3.Nb3 Kc6 4.Bd2 Kb5 5.c4 Ka4 6.Nc5#
(Hirokaz Onoda, 2007)

[...Nd4] captureless: 1.d3 d5 2.Kd2 Qd6 3.Kc3 Qa6 4.Kb4 Qa3 5.Kb5 Nc6 6.c3
Bd7 7.Qc2 Nd4# (Hirokaz Onoda, 2007)
{[Nd5] with promotion: 1.d4 e5 2.dxe5 Nf6 3.exf6 d6 4.fxg7 Be6 5.g8N Nd7
6.Nf6 Ke7 7.Bg5 Qe8 8.Nd5# (Hirokaz Onoda, 2007)}

[...Ne4] 1.f3 e6 2.Kf2 Qf6 3.Kg3 Qxf3 4.Kh4 Nf6 5.Kg5 Be7 6.h4 Ne4#
(Hirokaz Onoda, 2007)
{[Ne5] with promotion: 1.e4 d5 2.exd5 Nc6 3.dxc6 e6 4.cxb7 Bd6 5.b8N Ne7
6.Nc6 Kd7 7.Bb5 Re8 8.Ne5# (Hirokaz Onoda, 2007)}

[Nf5] 1.c4 e6 2.c5 Be7 3.c6 Bf6 4.cxb7 Nc6 5.bxc8N Rb8 6.Nd6 Ke7 7.Qc2 Qe8
8.Qc5 Nd8 9.Nf5# (Hirokaz Onoda, 2007)

[...Ng4] 1.d3 h6 2.Bxh6 Rh7 3.Bg5 Nh6 4.Bxe7 Bxe7 5.Kd2 Bd6 6.Ke3 Bxh2
7.Kf3 Bxg1 8.Kg3 Bxf2 9.Kh2 Ng4# (Hirokaz Onoda, 2007)

[Nh5] 1.d4 g6 2.d5 Bh6 3.d6 Kf8 4.dxe7 Kg7 5.e8N Kf8 6.Nf6 Kg7 7.Qd4 Qf8
8.Nh5# (Hirokaz Onoda, 2007)
{without promotion: 1.Nf3 g6 2.Ne5 Bh6 3.Nxd7 Bxd2 4.Bxd2 c6 5.Nf6 Kf8
6.Bc3 Kg7 7.Qd2 Qf8 8.Nh5# (Hirokaz Onoda, 2007)}


--- Knight to the 4th rank ---

[Na4/...Na5] vacant

[Nb4/...Nb5] vacant

[...Nc5] 1.e3 a6 2.Bxa6 Ra7 3.Bb5 Na6 4.Bxd7 Bxd7 5.d3 Bf5 6.Kd2 Bg6 7.Kc3
Qd4 8.Kb3 Qxb2 9.Ka4 Nc5# (Hirokaz Onoda, 2007)

[...Nd5] 1.e4 g6 2.Ke2 Bh6 3.Kd3 Kf8 4.Kd4 e5 5.Kxe5 Ne7 6.Kf6 d6 7.e5 Nd5#
(Hirokaz Onoda, 2007)

[Ne4] captureless: 1.c4 g6 2.Qb3 Bh6 3.Qh3 Kf8 4.d3 Kg7 5.Nd2 Kf6 6.Rb1 Kg5
7.Ne4# (Ulrich Ring, 2002)

[...Nf5] 1.d3 h6 2.Bxh6 Rh7 3.Bg5 Nh6 4.Bxe7 Qxe7 5.f4 Kd8 6.Kf2 Qxe2 7.Kg3
Qxg2 8.Kh4 Nf5# (Hirokaz Onoda, 2007)

[Ng4/...Ng5] vacant

[Nh4/...Nh5] vacant

 
--- Knight to the 3rd rank ---

[...Na6] 1.d3 Na6 2.Bg5 Nc5 3.Bxe7 Qxe7 4.Kd2 Qe6 5.Kc3 Qxa2 6.Kb4 d5 7.c3
Bd7 8.Qc2 Na6# (Hirokaz Onoda, 2007)

[Nb3/...Nb6] vacant

[...Nc6] 1.e3 a6 2.Bxa6 Nc6 3.Bb5 Na7 4.Bxd7 Kxd7 5.d3 Ke6 6.Kd2 Qd5 7.Kc3
Bd7 8.Kb4 Qb3 9.Ka5 Nc6# (Hirokaz Onoda, 2007)

[Nd3/...Nd6] vacant

[Ne3/...Ne6] vacant

[...Nf6] 1.d3 h6 2.Bxh6 Nf6 3.Bg5 Nh7 4.Bxe7 Qxe7 5.e3 Qe5 6.Ke2 Bd6 7.Kf3
Ke7 8.Kg4 Qg3 9.Kh5 Nf6# (Hirokaz Onoda, 2007)

[Ng3/...Ng6] vacant

[...Nh6] 1.e3 Nh6 2.Bb5 Nf5 3.Bxd7 Qxd7 4.Ke2 Qd6 5.Kf3 Qxh2 6.Kg4 e5 7.Nf3
Be7 8.Rg1 Nh6# (Hirokaz Onoda, 2007)


--- Knight to the 2nd rank ---
No games.


--- Knight to the 1st rank ---
 
[...Ng8] 1.e4 g6 2.Ke2 Bh6 3.Kd3 Kf8 4.Kd4 e5 5.Kxe5 Ne7 6.Kf6 d6 7.e5 Ng8#
(Hirokaz Onoda, 2007)



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