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MatPlus.Net Forum General Shortest mate from game starting position :-)

### Shortest mate from game starting position :-)

In a booklet with GM anekdotes, I found that
GM Nunn (who else) "found a shorter mate than
Fools Mate". It wasn't precisely formulated but
it's rather obvious that "sum over move length"
was meant.
1.f3 (1) e6 (1) 2.g4 (2) Qh4 (4V2)
1.e3 (1) d6 (1) 2.Ke2 (1) Qd7 (1) 3.Kf3 (V2) Qg4 (3V2)
As you see, 3 moves are not "longer" as 2, but I couldn't
get *below* 4+4V2 yet.
Does somebody have Nunns solution? (If yes, hold it for
a moment, other people want migraine too :-)

Hauke

Shortest possible from standard initial position found...and then one even shorter. But I will not tell!

Why? The shortest mate is shown here:

http://www.dailymotion.com/video/xe8467_nes-battle-chess-epic-checkmate-tas_videogames

:-)

Eero Bonsdorff, comm. Problem 35. TT 1960-61: What is the number of different games ending with mate, where the total geometric length of moves is shortest possible?
Solution: 2 (1.d3 e6 2.Dd2 Ke7/e5 3.De3 e5/Ke7 4.Dxe5#). The length is 7+sqrt(2)=8,41.

I actually saw this mating position in a tournament once. After 1.e4, e5 2.Qh5 black accidently touched his king. White forced him to play 2..., Ke7 and mated the next move.
Both players were very young, which explains a lot I guess.

And we, who know Chess960 (Fischer Random Chess), we have a better solution for everything...

<rant of an OTB player>
Consider the minimally Fischer-ized position: The B/S pairs swapped.
I tried a few games against myself - bleech.

Hauke

In Chess960IP TKTDLLSS (=initial position a-h) with game 1.c3 b6 2.Db3 b5 3.Dxb5#; move length total some 7,83 units. - Shortest mate measured in number of moves from a Chess960IP is 1,5 moves. - In Chess960 everything is shorter and easier, just try!

Am I correct that KB......Q (1.b3 g6#) is disallowed as the K
must be *between* the rooks? I'm not too familiar with
artifischal chess variants :-)

Hauke

Yeah, King must be between the Rooks, allowing castling either side, and Bishops on opposite colors (should get you to 960).
The K always lands on c1/g1 (even if already on those squares -- or beyond on b1!), the Rs always land on d1/f1.

If you play Chess960 on a Vertical Cylinder, does it increase the number of possible start positions?
Even if you accept that extra-long-castling (O-O-O-O & O-O-O-O-O) is legal on a Vertical Cylinder, I assume the setup must allow for all 4 castling options (thus, I guess it remains 960 start positions).

(= 2+10 )

a) Chess 960 + Circe Parrain
b) Chess 960 + Circe Parrain + Vertical Cylinder (extra-long-castling is legal)
c) Chess 960 + Circe Parrain + Vertical Cylinder (extra-long-castling is illegal)

How many unique positions are reached after white castles?