[Retros] Pawn to-the-5th-rank mates

[Francois Labelle]

Here are optimal proof games for cases that can be done in 5.0 moves or 
less.

category 1: c5#/...c4#, etc., mate by pawn itself

(4.5, 0) (b5#, Christoph Fieberg, 2002)
(4.5, 0) (d5#, Christoph Fieberg, 2002)
(4.5, 0) (e5#, Christoph Fieberg, 2002)
(4.5, 0) (g5#, Christoph Fieberg, 2002)

(5.0, 0) 1. e4 b5 2. Ke2 Bb7 3. Kd3 Bd5 4. Kc3 Nc6 5. Bd3 b4#
(5.0, 0) 1. f4 c5 2. Kf2 Qb6 3. Ke3 Qe6+ 4. Kd3 Nc6 5. Nc3 c4#
(4.0, 0) 1. d3 d5 2. Kd2 Qd7 3. Ke3 Qg4 4. Bd2 d4#
(4.0, 0) (...e4#, Richard Stanley, 1996)
(5.0, 0) 1. e4 d5 2. Ke2 Qd6 3. Kf3 Qh6 4. Kg3 f5 5. Nf3 f4#
(5.0, 0) 1. e4 e6 2. Ke2 Qh4 3. Kf3 g5 4. Be2 Bh6 5. Qf1 g4#
(5.0, 0) 1. e4 d5 2. Ke2 Qd6 3. Kf3 Qf6+ 4. Kg3 h5 5. Qf3 h4#

category 3: bxc5#/...bxc4#, etc., mate by pawn itself

(4.5, 1) 1. d4 e5 2. Bf4 Ke7 3. e3 Kf6 4. Qg4 Ne7 5. dxe5#
(4.5, 1) 1. e4 f5 2. Qf3 Kf7 3. Bc4+ Kg6 4. d3 Nf6 5. exf5#

(5.0, 1) 1. e3 d5 2. Bc4 Qd7 3. Ke2 Qg4+ 4. Kd3 Nd7 5. Nc3 dxc4#
(5.0, 3) 1. d4 e5 2. Kd2 Qg5+ 3. Kd3 Qxc1 4. c4 Qxd1+ 5. Kc3 exd4#
(5.0, 1) 1. e4 d5 2. Ke2 Bf5 3. Kf3 e6 4. Be2 Qg5 5. Qf1 dxe4#
(5.0, 1) 1. d3 e5 2. Bf4 Qe7 3. Kd2 Qb4+ 4. Ke3 Bd6 5. Nf3 exf4#
(5.0, 2) 1. d3 e5 2. Bf4 Qg5 3. Kd2 Qxg2 4. Ke3 g5 5. Nd2 gxf4#

Nothing in categories 2,4,5 in 5.0 moves or less (i.e. no discovered 
checkmate nor double checkmate).

 	Francois