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MatPlus.Net Forum General Shortest mate from game starting position :-)
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(1) Posted by Hauke Reddmann [Thursday, Jan 13, 2011 12:00]

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 :-)

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(2) Posted by Per Olin [Thursday, Jan 13, 2011 17:11]

Shortest possible from standard initial position found...and then one even shorter. But I will not tell!
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(3) Posted by Siegfried Hornecker [Thursday, Jan 13, 2011 20:24]

Why? The shortest mate is shown here:

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(4) Posted by Hannu Harkola [Thursday, Jan 13, 2011 21:17]

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.
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(5) Posted by Gilles Regniers [Friday, Jan 14, 2011 08:44]

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.
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(6) Posted by Per Olin [Friday, Jan 14, 2011 09:49]

And we, who know Chess960 (Fischer Random Chess), we have a better solution for everything...
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(7) Posted by Hauke Reddmann [Friday, Jan 14, 2011 11:22]

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

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(8) Posted by Per Olin [Saturday, Jan 15, 2011 11:19]

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!
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(9) Posted by Hauke Reddmann [Saturday, Jan 15, 2011 18:11]

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 :-)

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(10) Posted by Kevin Begley [Saturday, Jan 15, 2011 18:16]; edited by Kevin Begley [11-01-16]

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?
(hint: careful about vector assumptions)
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MatPlus.Net Forum General Shortest mate from game starting position :-)