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Subject: Test position GMG3 #13 - chess rules

Author: Steffen Jakob

Date: 08:25:03 09/26/00

Hi all!

I ran the GMG3 endgame test suite with Hossa. Here is the position #13:

[D]5q2/6pk/p7/1p3PPK/1P2Q3/8/8/8 w

The key move is 1.g6.

After a while Hossa gave 1.f6 with a score of +10.47. I thought that maybe f6 is
a possible solution too. So I examined the PV of Hossa. It started with

1.f6 h7g8 2.e4e6 f8f7 3.e6xf7 g8xf7 4.f6xg7 f7xg7 5.g6

which leads to this position:

[D]8/6k1/p5P1/1p5K/1P6/8/8/8 b

Here Hossa continued with 5... Kf6 which is indeed losing. All moves seem to be
losing here. But when I forced 5... b5 6. bxa5 Hossa gave a score of mate in 54!

How is this such a position handled in tournament chess? Is this a draw (I think
the rules have changed here several times?!)? If it's a draw then I will change
my tablebase probe code to return a draw score if the mate distance is > 50.

Best wishes,
Steffen.

• Re: Test position GMG3 #13 - chess rules Vincent Diepeveen 09:07:47 09/27/00
• Re: Test position GMG3 #13 - chess rules Bruce Moreland 09:29:04 09/26/00
  • Re: Test position GMG3 #13 - chess rules Steffen Jakob 10:21:17 09/26/00
    • Re: Test position GMG3 #13 - chess rules Uri Blass 11:28:55 09/26/00
• Re: Test position GMG3 #13 - chess rules Jason Williamson 08:30:05 09/26/00
  • Re: Test position GMG3 #13 - chess rules Steffen Jakob 08:36:13 09/26/00
    • Re: Test position GMG3 #13 - chess rules Uri Blass 09:01:48 09/26/00

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