[Retros] FEN fun + sol FPC

[Eric Angelini]

FPC<http://www.france-echecs.com/profil.php?uid=598>, le 09/08/2013 - 07:47:42

Je retire ce que j'ai dit : je l'ai et c'est même assez facile.
Bilan :
1: 10.0
2: 6.0 (très différent)
3: 6.5
4: 8.0
6: 14.0
7: 13.0



De : retros-bounces at janko.at [mailto:retros-bounces at janko.at] De la part de Eric Angelini
Envoyé : vendredi 9 août 2013 0:29
À : The Retrograde Analysis Mailing List
Objet : Re: [Retros] FEN fun


Thanks, François!
Best,
É.

Propulsé d'un aPhone



Le 8 août 2013 à 18:48, "Francois Labelle" <flab at wismuth.com<mailto:flab at wismuth.com>> a écrit :
As promised, here are the solutions to the FEN problems that I posted last week:

In 2.5 moves
1111222888: 1. d4 c5 2. dxc5 f5 3. Qxd7+

In 3.0 moves
1111223888: 1. d4 e5 2. dxe5 Bc5 3. Qxd7+ Kxd7
1112225588: 1. d4 c5 2. dxc5 Nc6 3. Qxd7+ Bxd7
113334488: 1. d4 e5 2. dxe5 d6 3. Qxd6 cxd6

In 3.5 moves
11123344456: 1. d3 g5 2. Bxg5 d5 3. Bxe7 f6 4. Bb4
11226888: 1. Nc3 d5 2. Nxd5 Bg4 3. Nxe7 Qxd2+ 4. Bxd2
12234888: 1. Nc3 d5 2. Nxd5 Be6 3. Nxe7 Qxd2+ 4. Bxd2
1227888: 1. Nc3 d5 2. Nxd5 Bh3 3. Nxe7 Qxd2+ 4. Bxd2
123333488: 1. d4 e5 2. dxe5 d6 3. Qxd6 cxd6 4. Bh6

In 4.0 moves
111112225668: 1. d4 c5 2. dxc5 Qb6 3. Qxd7+ Bxd7 4. g4 Bxg4
11112223888: 1. d4 c5 2. dxc5 g5 3. Qxd7+ Nxd7 4. Bxg5 Nxc5
112222333366: 1. d3 d6 2. Bg5 Bg4 3. e3 e6 4. Qxg4 Qxg5
11222233488: 1. d4 h6 2. Bxh6 Nxh6 3. e3 Ng4 4. Qxg4 Rxh2
112226688: 1. Nc3 d5 2. Nxd5 Bg4 3. Nb6 Qxd2+ 4. Bxd2 cxb6
12226788: 1. Nc3 d5 2. Nxd5 Bh3 3. Nb6 Qxd2+ 4. Bxd2 cxb6
12235888: 1. Nc3 d5 2. Nxd5 Bf5 3. Nxe7 Qxd2+ 4. Bxd2 Kxe7
12334888: 1. Nc3 d5 2. Nxd5 Be6 3. Nxe7 Qxd2+ 4. Bxd2 Kxe7
1237888: 1. Nc3 d5 2. Nxd5 Bh3 3. Nxe7 Qxd2+ 4. Bxd2 Kxe7
2222334477: 1. e4 h5 2. Qxh5 Rxh5 3. d3 Nh6 4. Bxh6 gxh6
222233778: 1. e4 h5 2. Qxh5 Rxh5 3. d4 Nh6 4. Bxh6 gxh6

    Francois

On 08/01/2013 10:54 AM, Francois Labelle wrote:
Hi all,
Below are FEN problems with a unique solution.

"Find a game reaching a position with the given multiset of FEN digits"

1111222888 in 2.5 moves (2 captures)

1111223888 in 3.0 moves (3 captures)
1112225588 in 3.0 moves (3 captures)
113334488 in 3.0 moves (3 captures)

11123344456 in 3.5 moves (2 captures)
11226888 in 3.5 moves (4 captures)
12234888 in 3.5 moves (4 captures)
1227888 in 3.5 moves (4 captures)
123333488 in 3.5 moves (3 captures)

111112225668 in 4.0 moves (4 captures)
11112223888 in 4.0 moves (5 captures)
112222333366 in 4.0 moves (2 captures)
11222233488 in 4.0 moves (4 captures)
112226688 in 4.0 moves (4 captures)
12226788 in 4.0 moves (4 captures)
12235888 in 4.0 moves (5 captures)
12334888 in 4.0 moves (5 captures)
1237888 in 4.0 moves (5 captures)
2222334477 in 4.0 moves (4 captures)
222233778 in 4.0 moves (4 captures)

The number of captures is implied by the FEN digits (it is the sum minus 32), so I report it to save you the effort.

I think that the first problem is worth solving (being the shortest problem of this type). Then it's up to you if you want to solve more. Note that I'm blindly giving the exhaustive list of such problems up to 4.0 moves, so some of the solutions are very similar. For publication it would be better to make an editorial selection and pick only one problem for each "idea".

I'll post the solutions in one week.

    Francois


On 07/30/2013 04:47 AM, Eric Angelini wrote:

Hello Retro-fans,
here is a 5-minute puzzle for the August break.

It is possible to reach, after Black's third move,
many positions having a FEN format where all numbers are prime.
Find a game where the last move was _not_ a pawn move.
(The solution is far from being unique -- but the "trick" yes,
I hope.)

http://en.wikipedia.org/wiki/Forsyth%E2%80%93Edwards_Notation

Best,
É.
(BTW, does this open a new kind of chess problems -- I mean,
playing with the FEN notation -- or is it, as I imagine, old hat?)





_______________________________________________

Retros mailing list

Retros at janko.at<mailto:Retros at janko.at>

http://www.pairlist.net/mailman/listinfo/retros





_______________________________________________

Retros mailing list

Retros at janko.at<mailto:Retros at janko.at>

http://www.pairlist.net/mailman/listinfo/retros

_______________________________________________
Retros mailing list
Retros at janko.at<mailto:Retros at janko.at>
http://www.pairlist.net/mailman/listinfo/retros
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/retros/attachments/20130809/9201a12e/attachment.htm>