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Subject: Re: Simple Endgame for programs without TBs ??

Author: Bruce Moreland

Date: 17:11:10 11/21/00

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On November 21, 2000 at 19:12:13, Brian Richardson wrote:

>On November 21, 2000 at 18:27:28, Eduard Nemeth wrote:
>
>>[D]8/2K5/1p6/1P4k1/5p2/8/6P1/8 w - - 0 1
>>
>>Here a correct analysis:
>>
>>1. Kc6 Kg4 2. Kd6 Kh4 3. Ke6 Kg5 4. Ke5 Kg4 5. Kf6 Kh4 6. Kf5 Kg3 7. Kg5 f3 8.
>>gxf3 Kxf3 9. Kf5 ++-
>>
>>1.Kxb6 is draw.
>>
>>By me this winning only Fritz, without TBs !
>>
>>Eduard
>
>Crafty v17.12 finds the right move, but not the full mate after 1:15 on my
>PIII733 at a pretty remarkable depth 23:
>
>               23     1:05   7.12   1. Kxb6 Kg4 2. Kc6 Kg3 3. b6 Kxg2 4.
>                                    b7 f3 5. b8=Q f2 6. Qg8+ Kh1 7. Qc4
>                                    Kg1 8. Qc5 Kg2 9. Qg5+ Kh1 10. Qh6+
>                                    Kg2 11. Qg7+ Kh2 12. Qh7+ Kg1 13. Qg6+
>                                    Kh2 14. Qh5+ Kg1 15. Qg4+ Kh1 16. Qf3+
>                                    Kg1 17. Qg3+ Kf1 18. Qe5
>               23     1:15     ++   1. Kc6!!
>               23     1:23   8.19   1. Kc6 Kg4 2. Kd6 Kh4 3. Ke6 Kg5 4.
>                                    Ke5 Kg6 5. Kxf4 Kf6 6. g4 Ke6 7. Kg5
>                                    Kd5 8. Kg6 Kc5 9. g5 Kxb5 10. Kf7 Kc4
>                                    11. g6 <HT>
>               23->   1:31   8.19   1. Kc6 Kg4 2. Kd6 Kh4 3. Ke6 Kg5 4.
>                                    Ke5 Kg6 5. Kxf4 Kf6 6. g4 Ke6 7. Kg5
>                                    Kd5 8. Kg6 Kc5 9. g5 Kxb5 10. Kf7 Kc4
>                                    11. g6 <HT>

I don't know what's beyond the hash table cutoff, but that looks like a huge
bonus for an unstoppable pawn.

What does Crafty think of the Reti study:

[D]7K/8/k1P5/7p/8/8/8/8 w - - 0 1

White to move draws.  I might have this slightly wrong, because I'm constructing
it from memory.

bruce




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