Games determined by their last move

Games determined by their last move

Posers and Puzzles

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S
Standard memberSwissGambit
Caninus Interruptus

2014.05.01

Joined
11 Apr 07
Moves
92274
03 Apr 08

Originally posted by c0lefalk
Wow, twelve minutes.
Hey, now, don't talk like that. 11.5 of those minutes were finding the thread, honest! 😉

D
Standard memberDejection

Joined
12 Sep 07
Moves
2668
03 Apr 08

A hint to the Rh1# one please?

J
Standard memberJirakon

In Christ

Joined
30 Apr 07
Moves
172
03 Apr 08
1 edit

NOOO!!!! If you give a hint, send to them in a message please 🙂

G
Standard memberGregM

Joined
13 Dec 06
Moves
792
03 Apr 08

I've written a program to search for these games; the only four 3-move games with unique ending moves end in

3. ... Bxb3+
3. ... Bf6+
3. ... Rxe5+
3. ... Qd4#

It's working on 3.5 move games now.

h
Standard memberheinzkat

Joined
25 Apr 06
Moves
5939
03 Apr 08
2 edits

1. c3 d6
2. Qb3 Be6
3. Kd1 Bxb3+

h
Standard memberheinzkat

Joined
25 Apr 06
Moves
5939
03 Apr 08

1. d3 e6
2. Kd2 Be7
3. Kc3 Bf6+

h
Standard memberheinzkat

Joined
25 Apr 06
Moves
5939
03 Apr 08

1. e4 h5
2. Qxh5 Rxh5
3. e5 Rxe5+

h
Standard memberheinzkat

Joined
25 Apr 06
Moves
5939
03 Apr 08

1. f3 e5
2. Kf2 Qh4+
3. Ke3 Qd4#

G
Standard memberGregM

Joined
13 Dec 06
Moves
792
03 Apr 08
1 edit

4. Ra8 and its symmetric partner
4. Rh8 are the complete list of unique ending moves for 3.5-move games.

h
Standard memberheinzkat

Joined
25 Apr 06
Moves
5939
03 Apr 08

Nice, the question is how did you find them?

G
Standard memberGregM

Joined
13 Dec 06
Moves
792
03 Apr 08
1 edit

Originally posted by heinzkat
Nice, the question is how did you find them?
As I mentioned above, I wrote a program to exhaust all the possibilities. To have it look at all 4-move games would take the better part of the day, so I'm trying to find a way to speed up the algorithm.

h
Standard memberheinzkat

Joined
25 Apr 06
Moves
5939
03 Apr 08

1. a4 b5
2. axb5 Nc6
3. Rxa7 Rb8
4. Ra8

G
Standard memberGregM

Joined
13 Dec 06
Moves
792
03 Apr 08

Nicely done.

h
Standard memberheinzkat

Joined
25 Apr 06
Moves
5939
03 Apr 08

... and similar of course
1. h4 g5
2. hxg5 Nf6
3. Rxh7 Rg8
4. Rh8

h
Standard memberheinzkat

Joined
25 Apr 06
Moves
5939
03 Apr 08

Originally posted by GregM
Nicely done.
The writing of the fens took more time than solving it. But what kind of program did you write?