[Retros] FEN fun

[Francois Labelle]

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?)

>>

>>

>>

>>

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>

>

>

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