Mark Thornton Mark.Thornton at PapworthEverard.co.uk
Mon Apr 21 15:26:42 EDT 2014

Dear Francois,

I think the last game, Becker-Bissbort, looks like a pre-arranged draw to
me.

Best wishes
Mark
------------------------
Retros Sub-Editor, The Problemist
8 Wimbish Road, Papworth Everard, Cambridge CB23 3XJ, UK
e: Mark.Thornton at PapworthEverard.co.uk

----- Original Message -----
From: "Francois Labelle" <flab at wismuth.com>
To: "The Retrograde Analysis Mailing List" <retros at janko.at>
Cc: <Mark.Thornton at papwortheverard.co.uk>
Sent: Friday, November 01, 2013 3:50 PM

On 05/24/2013 06:34 PM, Kevin Begley wrote:

> It would be interesting if a program could sift through a large game

> database, and find the longest unique game.

I searched 5,015,441 games from the ICOfY Base 13.2.2 (
http://icofy-blog.de/icofy-base/ ) Here are some results.

Table 1:
For each length n
- the number of distinct unique proof games in n moves seen
- the number of unique proof games in n moves seen (with repetition).

0.5: 20 5015441
1.0: 338 5015441
1.5: 554 562724
2.0: 602 221155
2.5: 289 66716
3.0: 198 49543
3.5: 134 1770
4.0: 69 701
4.5: 40 561
5.0: 22 103
5.5: 14 22
6.0: 11 14
6.5: 3 3
7.0: 1 1
7.5: 1 1
8.0: 1 1
8.5: 0 0

Table 2:
For each length n, the top 3 most popular unique proof games in n moves
(with the number of appearances in parentheses).

0.5 moves:
(2496418) 1. e4
(1627387) 1. d4
(391580) 1. Nf3

1.0 move:
(1007096) 1. e4 c5
(900157) 1. d4 Nf6
(599493) 1. e4 e5

1.5 moves:
(84958) 1. e4 d5 2. exd5
(73479) 1. c4 Nf6 2. Nc3
(62222) 1. c4 e5 2. Nc3

2.0 moves:
(51550) 1. e4 d5 2. exd5 Qxd5
(45576) 1. e4 Nf6 2. e5 Nd5
(33062) 1. e4 d5 2. exd5 Nf6

2.5 moves:
(46808) 1. e4 d5 2. exd5 Qxd5 3. Nc3
(4566) 1. e4 d5 2. exd5 Nf6 3. Bb5+
(4050) 1. b4 e5 2. Bb2 Bxb4 3. Bxe5

3.0 moves:
(32707) 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5
(10198) 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd6
(3135) 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd8

3.5 moves:
(579) 1. d4 f5 2. Bg5 Nf6 3. Bxf6 exf6 4. e3
(393) 1. d4 Nf6 2. Bg5 Ne4 3. Bh4 g5 4. f3
(148) 1. e4 Nf6 2. Bc4 Nxe4 3. Bxf7+ Kxf7 4. Qh5+

4.0 moves:
(378) 1. d4 Nf6 2. Bg5 Ne4 3. Bh4 g5 4. f3 gxh4
(59) 1. e4 Nf6 2. Bc4 Nxe4 3. Bxf7+ Kxf7 4. Qh5+ Kg8
(37) 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. Bb5+ c6

4.5 moves:
(378) 1. d4 Nf6 2. Bg5 Ne4 3. Bh4 g5 4. f3 gxh4 5. fxe4
(59) 1. e4 Nf6 2. Bc4 Nxe4 3. Bxf7+ Kxf7 4. Qh5+ Kg8 5. Qd5+
(29) 1. d4 d5 2. Bf4 Bf5 3. e3 e6 4. Bd3 Bxd3 5. Qxd3

5.0 moves:
(59) 1. e4 Nf6 2. Bc4 Nxe4 3. Bxf7+ Kxf7 4. Qh5+ Kg8 5. Qd5+ e6
(9) 1. d4 f5 2. Bg5 Nf6 3. Bxf6 exf6 4. c4 Bb4+ 5. Nc3 O-O
(6) 1. d4 d5 2. Bf4 Bf5 3. e3 e6 4. Bd3 Bxd3 5. Qxd3 Bd6

5.5 moves:
(5) 1. d4 f5 2. Bg5 Nf6 3. Bxf6 exf6 4. c4 Bb4+ 5. Nc3 Bxc3+ 6. bxc3
(4) 1. d4 f5 2. Bg5 Nf6 3. Bxf6 exf6 4. c4 Bb4+ 5. Nc3 O-O 6. e3
(2) 1. d4 f5 2. Bg5 Nf6 3. Bxf6 exf6 4. c4 Bb4+ 5. Nc3 O-O 6. Qb3

6.0 moves:
(2) 1. d4 f5 2. Bg5 Nf6 3. Bxf6 exf6 4. c4 Bb4+ 5. Nc3 Bxc3+ 6. bxc3 O-O
(2) 1. d4 f5 2. Bg5 Nf6 3. Bxf6 exf6 4. c4 Bb4+ 5. Nc3 Bxc3+ 6. bxc3 Qe7
(2) 1. d4 f5 2. Bg5 Nf6 3. Bxf6 exf6 4. c4 Bb4+ 5. Nc3 O-O 6. e3 Re8

6.5 moves:
(1) 1. d4 f5 2. Bg5 Nf6 3. Bxf6 exf6 4. c4 Bb4+ 5. Nc3 O-O 6. e3 Re8 7. Ne2
(1) 1. d4 f5 2. Bg5 Nf6 3. Bxf6 exf6 4. c4 Bb4+ 5. Nc3 c5 6. e3 Qa5 7. Ne2
(1) 1. d4 d5 2. Bg5 Bf5 3. Bxe7 Bxc2 4. Bxd8 Bxd1 5. Bxc7 Bxe2 6. Bxb8
Bxf1 7. Bxa7

7.0 moves:
(1) 1. d4 d5 2. Bg5 Bf5 3. Bxe7 Bxc2 4. Bxd8 Bxd1 5. Bxc7 Bxe2 6. Bxb8
Bxf1 7. Bxa7 Bxg2

7.5 moves:
(1) 1. d4 d5 2. Bg5 Bf5 3. Bxe7 Bxc2 4. Bxd8 Bxd1 5. Bxc7 Bxe2 6. Bxb8
Bxf1 7. Bxa7 Bxg2 8. Bc5

8.0 moves:
(1) 1. d4 d5 2. Bg5 Bf5 3. Bxe7 Bxc2 4. Bxd8 Bxd1 5. Bxc7 Bxe2 6. Bxb8
Bxf1 7. Bxa7 Bxg2 8. Bc5 Bxh1

Below are the 3 games that start with unique proof games of length 6.5,
6.5 and 8.0, respectively.

[Event "?"]
[Site "?"]
[Date "1996.??.??"]
[Round "?"]
[Black "Sleisz, Tamas"]
[Result "1-0"]
[WhiteElo "2160"]
[BlackElo "2280"]
[ECO "A80"]
[EventDate "1996.??.??"]
[PlyCount "87"]

1.d4 f5 2.Bg5 Nf6 3.Bxf6 exf6 4.c4 Bb4+ 5.Nc3 O-O 6.e3 Re8 7.Ne2 c6 8.Qb3
Na6 9.a3 Qa5 10.Rc1 Bxc3+ 11.Rxc3 d6 12.g3 Be6 13.Nf4 Bf7 14.Qc2 g6 15.Bd3
Qd8 16.b4 Nc7 17.O-O Qe7 18.a4 a5 19.b5 c5 20.Rd1 Rad8 21.Bf1 b6 22.Bg2
Kg7 23.Bc6 Rg8 24.Rcd3 g5 25.dxc5 dxc5 26.Rd7 Rxd7 27.Rxd7 Qe5 28.Nd3 Qa1+
29.Qc1 Qxc1+ 30.Nxc1 Ne6 31.Bd5 Kg6 32.Rb7 g4 33.Rxb6 Ng5 34.Bxf7+ Nxf7
35.Nd3 Rd8 36.Nf4+ Kh6 37.Rxf6+ Kg7 38.Rxf5 Rd1+ 39.Kg2 h6 40.Rxc5 Ng5 41.
h3 Nf3 42.hxg4 Ne1+ 43.Kh3 Rd2 44.g5 1-0

[Event "?"]
[Site "?"]
[Date "1994.??.??"]
[Round "?"]
[White "Kolman, Richard"]
[Black "Lenhart, Djuro"]
[Result "1-0"]
[BlackElo "2250"]
[ECO "A80"]
[EventDate "1994.??.??"]
[PlyCount "47"]

1.d4 f5 2.Bg5 Nf6 3.Bxf6 exf6 4.c4 Bb4+ 5.Nc3 c5 6.e3 Qa5 7.Ne2 cxd4 8.
exd4 b5 9.c5 Bb7 10.Qb3 Be4 11.O-O-O Bxc3 12.Nxc3 a6 13.d5 b4 14.Na4 d6
15.f3 dxc5 16.fxe4 fxe4 17.d6 Nc6 18.Qe6+ Kd8 19.b3 Re8 20.Qd5 e3 21.Qxc6
Rb8 22.Nxc5 Re7 23.dxe7+ Kxe7 24.Qe6+ 1-0

[Event "?"]
[Site "?"]
[Date "2003.??.??"]
[Round "?"]
[White "Becker, Johannes"]
[Black "Bissbort, Julian"]
[Result "1/2-1/2"]
[ECO "D00"]
[EventDate "2003.??.??"]
[PlyCount "22"]

1.d4 d5 2.Bg5 Bf5 3.Bxe7 Bxc2 4.Bxd8 Bxd1 5.Bxc7 Bxe2 6.Bxb8 Bxf1 7.Bxa7
Bxg2 8.Bc5 Bxh1 9.Bxf8 Be4 10.Bxg7 Bxb1 11.Bxh8 Bxa2 1/2-1/2

François

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