Shortest-proof-game challenge

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daStrwbrry
BishopTakesH7 wrote:
daStrwbrry wrote:
BishopTakesH7 wrote:
 

I'd like someone other than @n9531l1 to post the solution to this one.

This was a fun proof game to solve. 13.0

Is there a name for this idea where the knight visits every knight square?

I don’t think there is a name for this, although this is a very nice idea I didn’t realise! The b1 knight does end up on g1 though, so it is considered an impostor knight. However, the knight doesn’t need to visit b8 or g8 to be an impostor: it just needs to end up on the home square of the other knight.

BishopTakesH7
daStrwbrry wrote:

Is there a name for this idea where the knight visits every knight square?

I don’t think there is a name for this [...]

I suppose it could also be a very literal knight's tour.

EvinSung
tygxc

@6726

daStrwbrry
EvinSung wrote:
#6726

Unique SPG in 14.5. The knight swap is needed.

daStrwbrry

Ignore the above post, it isn’t unique: Ng8 has multiple ways to g1.

Here is EvinSung’s edited position.

BigDoggProblem
daStrwbrry wrote:

Ignore the above post, it isn’t unique: Ng8 has multiple ways to g1.

Here is EvinSung’s edited position.

Gotta love chess.com's unlimited edit policy.

Leaves solvers spinning their wheels, trying to hit a moving target.

The end lesson is not to engage posts so quickly. Just what any healthy forum needs.

Leither123
BigDoggProblem
Leither123 wrote:
 

#6731

13.0

Leither123
BigDoggProblem
Leither123 wrote:
 

#6733

14.0

EvinSung

hi

EvinSung
tygxc

@6736

First try:

n9531l1
EvinSung wrote:
#6736

Unique SPG in 14.5.

n9531l1

Two questions:

1. Is this position's SPG unique?

2. For what other move count does the position have a unique proof game?

BigDoggProblem
n9531l1 wrote:

Two questions:

1. Is this position's SPG unique?

2. For what other move count does the position have a unique proof game?

1. Yes

EvinSung
BigDoggProblem

Please don't use computers. I did a test already. It's sound.

Hardly original, but seems to be the shortest possible problem of this theme.

n9531l1
BigDoggProblem wrote:

Please don't use computers. I did a test already. It's sound.

Hardly original, but seems to be the shortest possible problem of this theme.

Is "this theme" the theme of a position with unique proof games of different lengths?