Author: Roy Eassa
Date: 07:54:09 10/05/02
Go up one level in this thread
On October 04, 2002 at 19:54:55, Jeremiah Penery wrote:
>This is from an old CCC post: http://ccc.it.ro/search/ccc.php?art_id=30621
>
>[D]8/6pp/4pk2/4p3/2PqP3/3Q2P1/4KP2/8 w - - 18 62
>
>I'm interested to see which programs want to play the losing Qxd4, and how long
>they take to switch to another move.
I think it's a draw whether or not White trades Queens here, unless White fails
to play f4xe5 when given the opportunity (in which case Black wins):
1.Qxd4 exd4 2.Kd3
[2.f4 e5 transposes (but not 2...Ke7? 3.e5!)]
[2.e5+ Kxe5 3.Kd3 Kd6 4.Kxd4 e5+ 5.Ke4 draws]
2...e5 3.f4 h5 4.fxe5+
[4.f5? g6 5.fxg6 Kxg6 6.c5 Kf6 7.Kc4 Ke7 8.Kb3 Kd7 9.Kb4 Kc7 10.Kb3 Kb7
11.Kb4 Ka6! -+]
4...Kxe5 5.c5 g5 6.c6 Kd6 7.Kxd4 h4 8.gxh4 gxh4 9.Ke3 =
A good variation puzzle is the position after 3 moves: does any program want to
play 4.f5?? (loses) instead of 4.fxe5+ (draws) in this position:
[d] 8/6p1/5k2/4p2p/2PpPP2/3K2P1/8/8 w - h6 0 4
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