[Retros] Corrections for the "Knights game" YefimT 09/04/2004

[TregerYefim at aol.com]

 Hello, Yefim
In a message dated 9/4/2004 8:08:35 AM Eastern Daylight Time, 
mri_two at t-online.de writes:



> Hello,

> 

> last sunday I asked:

> 

> > (1) What is the longest possible chess game, if both sides only

> >     move their knights and the 50-move-rule applies?

> 

> > (2) What is the longest possible chess game, if both sides only

> >     make pawn moves? (To make it clear, after a promotion, promoted

> >     pawns are not allowed to move.)

> 

> The only answers given to this list were by Yefim Treger,

> who stated:

> 

> > (1) ... Correct answer is 24*100+99=2499 half-moves (100% sure:).

> 

> > (2) ... My correct answer is 84 half-moves (75% sure:).

> 

> 

> 

> 

> I think it's now time to show my solutions:

> 

> (1) Longest possible game with only knights moving:  2603 half-moves

> 

>    An outline of a possible game:

>     50. ... Nxa1

>    100. ... Nxc1

>    150. ... Nxd1

>    200. ... Nxf1

>    250. ... Nxh1

>    300. ... Nxa2

>    350. ... Nxb2

>    400. ... Nxd2

>    450. ... Nxe2

>    500. ... Nxf2

>    550. ... Nxh2

>    600. ... Nxc2+

>    601. Nxc2 ...

>    651. Nxa8 ...

>    701. Nxc8 ...

>    751. Nxd8 ...

>    801. Nxf8 ...

>    851. Nxh8 ...

>    901. Nxa7 ...

>    951. Nxb7 ...

>   1001. Nxd7 ...

>   1051. Nxe7 ...

>   1101. Nxf7 ...

>   1151. Nxh7 ...

>   1201. Nxc7+ Nxc7

>   1251. ...   Nxg2+

>   1252. Nxg2  ...

>   1302. Nxg7+


 Something is wrong between  
 1252 and 1302 moves. How many Knights left?
Only one White Knight and Black has no Knights moves!
  So, answer is 1252*2-1=2503. What is different from solution Yefim's  by 3 
(yes, I  missed 3 tricky captured pawns c2, c7, g2).
Sincerely, Yefim.

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