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Subject: Re: Mate in 30

Author: Anthony Cozzie

Date: 18:28:28 09/06/04

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On September 06, 2004 at 20:25:46, stuart taylor wrote:

>On September 06, 2004 at 20:19:49, Anthony Cozzie wrote:
>
>>On September 06, 2004 at 17:52:41, Stuart Cracraft wrote:
>>
>>>On September 06, 2004 at 15:07:00, Stuart Cracraft wrote:
>>>
>>>>[D] 5n2/B3K3/2p2Np1/4k3/7P/3bN1P1/2Prn1P1/1q6 w - - 0 0
>>>>
>>>>Anyone can get this besides Ed?
>>>>
>>>>Please post your search times.
>>>
>>>BTW, Ed does it at ply 1 in 2351 positions.
>>>
>>>I would assume his program was heavily tuned on this position.
>>
>>You are making things out to be way more complicated then they are.  If you have
>>1-rep (1 ply) and check (1-ply) you will get this position instantly (like Uri).
>> Ed even says that is how he does it.  Its not magic ;)
>>
>>anthony
>
>Nothing to do with great pruning? (I'm ignorant as to what you are explaining
>andwould be interested to understand)
>S.Taylor

Sure.

Normal Zappa says:
1. Nf6-g4 Ke5-e4 2. Ng4-f2 Ke4-e5 3. Nf2-g4
 = (0.00)	Depth: 1/10	00:00:00.00	0kN (62 KN/s, 0 splits, 0 aborts)
1. Ne3-g4 Ke5-f5 2. Ng4-h6 Kf5-e5 3. Nh6-f7 Ke5-f5 4. Nf7-d6 Kf5-e5 5. Nf6-g4
Ke5-d5 6. c2-c4 Bd3xc4 7. Ng4-e3 Kd5-e5 8. Nd6xc4 Ke5-e4 9. Nc4xd2 Ke4-d3 10.
Nd2xb1
 = (4.89)	Depth: 11/22	00:00:00.70	458kN (655 KN/s, 0 splits, 0 aborts)
1. Ne3-g4 Ke5-f5 2. Ng4-h6 Kf5-e5 3. Nh6-f7 Ke5-f5 4. Nf7-d6 Kf5-e5 5. Nf6-g4
Ke5-d5 6. c2-c4 Bd3xc4 7. Ng4-e3 Kd5-e5 8. Nd6xc4 Ke5-e4 9. Nc4xd2 Ke4-e5 10.
Nd2xb1 Nf8-h7 11. Ke7-f7 g6-g5 12. Kf7-g6
 = (5.22)	Depth: 21/34	00:02:28.16	152135kN (1027 KN/s, 0 splits, 0 aborts)

Null move is of course very effective here, which is why it is able to get depth
21 so quickly: Nf6-g4 draws, Ne3-g4 wins, and everything else loses instantly.

With one-rep enabled:

1. Ne3-g4 Ke5-f5 2. Ng4-h6 Kf5-e5 3. Nh6-f7 Ke5-f5 4. Nf7-d6 Kf5-e5 5. Nf6-g4
Ke5-d5 6. Ng4-e3 Kd5-e5 7. Nd6-f7 Ke5-e4 8. Nf7-g5 Ke4-e5 9. Ng5-f3 Ke5-e4 10.
Nf3xd2 Ke4-e5 11. Nd2-f3 Ke5-e4 12. Nf3-g5 Ke4-e5 13. Ng5-f7 Ke5-e4 14. Nf7-d6
Ke4-e5 15. Ne3-g4 Ke5-d5 16. Ng4-f6 Kd5-e5 17. Nd6-f7 Ke5-f5 18. Nf7-h6 Kf5-e5
19. Nh6-g4 Ke5-f5 20. Ng4-e3 Kf5-e5 21. Nf6-g4 Ke5-e4 22. Ng4-f2 Ke4-e5 23.
Nf2xd3 Ke5-e4 24. Nd3-f2 Ke4-e5 25. Nf2-g4 Ke5-e4 26. Ng4-f6 Ke4-e5 27. Ne3-c4
Ke5-f5 28. Nc4-d6 Kf5-e5 29. Nf6-g4 Ke5-d5 30. c2-c4
 =   MAT30	Depth: 2/81	00:00:00.21	49kN (236 KN/s, 0 splits, 0 aborts)

This whole combination is simply white-checks, black has one response, rinse and
repeat.  It is just a question of whether you tell the engine to follow forcing
lines or not.  I think most of the time it is not worth it.

anthony



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