Author: Dann Corbit
Date: 14:02:42 10/10/01
Go up one level in this thread
On October 10, 2001 at 12:12:27, Uri Blass wrote:
>On October 10, 2001 at 12:02:11, John Merlino wrote:
>
>>On October 09, 2001 at 18:09:06, Dann Corbit wrote:
>>
>>>On October 09, 2001 at 13:01:13, Uri Blass wrote:
>>>
>>>>[D]8/1P6/8/5k2/2K4p/7r/1r4p1/6R1 b - - 0 61
>>>>
>>>>This position is from the game Tao-Deep Junior7 in the last WMCCC
>>>>
>>>>Chest need some hours on p200 to see mate in 10(I used chest by the way that was
>>>>explained by paul some days ago
>>>>
>>>>see http://www.icdchess.com/forums/1/message.shtml?191857
>>>>
>>>>Solution:61...Rg3 62.Kd4 h3 63.Kd5 h2 64.b8Q Rxb8 65.Re1 Rd3+ 66.Kc4 h1Q 67.Re5+
>>>>Kxe5 68.Kxd3 Qd1+ 69.Kc3 Rb3+ 70.Kc4 Qc2#
>>>>
>>>>15961 seconds,292,407,791 nodes
>>>>
>>>>In the game Deep Junior7 missed the right move(Rg3) but it did not help Tao that
>>>>resigned after Rxb7.
>>>>
>>>>How much time does your program need to see mate in 10 with the full 5 piece
>>>>tablebases and without tablebases?
>>>
>>>Here is the CM8000 verbose explanation:
>>>"Analysis: You move your rook to g3, which moves it behind the passed pawn at
>>>g2. White counters with rook to d1. Your rook captures pawn, which removes the
>>>promote threat at b7. White responds by moving rook to d5, which checks your
>>>king. You move your king to e4, which moves it out of check. White counters by
>>>moving the rook to d4, which checks your king. You move your king to e5, which
>>>moves it out of check. White responds by moving rook to d5, which checks your
>>>king. You move your king to e6, which moves it out of check. White replies by
>>>moving the rook to d1. You move your rook to c7, which checks White's king.
>>>White responds with the king to b4, which moves it out of check. You move your
>>>pawn to g1 with a queen promotion, which threatens White's rook. White counters
>>>with rook captures queen. Your rook captures rook. White responds by moving king
>>>to a3. You move your pawn to h3, which pushes the passed pawn. White responds by
>>>moving the king to a4. You move your pawn to h2, which adds a promote threat at
>>>h2. White counters by moving the king to a5. You move your pawn to h1 with a
>>>queen promotion.
>>>
>>>As a result of this line of play, you win a rook and a pawn. Additionally, you
>>>gain a queen through promotion. Also, White's King is driven away from the
>>>middle of the board. With this material, you should be able to force a mate."
>>>
>>>Here is the SAN output for CM8000:
>>>Time Depth Score Positions Moves
>>>9:09 10/11 -20.85 91605523 1...Rg3 2. Rd1 Rxb7 3. Rd5+ Ke4 4. Rd4+ Ke5 5. Rd5+
>>>Ke6 6. Rd1 Rc7+ 7. Kb4 g1=Q 8. Rxg1 Rxg1 9. Ka3 h3 10. Ka4 h2 11. Ka5 h1=Q
>>
>>Very amusing that you put the text analysis in there. I don't think I've ever
>>seen anybody else bother to do that on this board.
>>
>>Here's what I got with CM8000 on a PIII-733 (default personality, 32MB hash)
>>
>>Time Depth Score Positions Moves
>>0:00 3/4 -11.28 3940 1...Rg3 2. Kd4 h3 3. b8=Q Rxb8
>>0:00 4/5 -11.60 14839 1...Rg3 2. Kc5 h3 3. Kd4 Rb4+ 4.
>> Kd5 Rxb7
>>0:00 5/6 -11.79 38085 1...Rg3 2. Kc5 h3 3. Kd4 Rb4+ 4.
>> Kc5 Rxb7 5. Kd4
>>0:02 6/7 -13.99 149165 1...Rg3 2. Rxg2 Rgxg2 3. Kd5 h3
>> 4. Kd4 h2 5. b8=Q Rg4+ 6. Ke3 Rxb8
>>0:04 7/8 -14.23 418052 1...Rg3 2. Rxg2 Rgxg2 3. Kd5 Rgd2+
>> 4. Kc6 h3 5. Kc5 Rxb7
>>0:15 8/9 -15.92 1834376 1...Rg3 2. Rxg2 Rgxg2 3. Kd5 h3
>> 4. b8=Q Rxb8 5. Kc6 h2 6. Kc7 Rg7+
>> 7. Kxb8 h1=Q
>>1:44 9/10 -18.15 12919471 1...Rg3 2. Rd1 Rxb7 3. Rd5+ Ke4
>> 4. Rd4+ Ke5 5. Rd5+ Kf6 6. Rd1
>> h3 7. Kc5 h2 8. Kc6 h1=Q 9. Rd6+
>> Ke5
>>4:54 10/11 -20.83 35997947 1...Rg3 2. Rd1 g1=Q 3. Rxg1 Rxg1
>> 4. b8=Q Rxb8 5. Kd4 h3 6. Kc5 Rc1+
>> 7. Kd4 h2 8. Ke3 Re8+ 9. Kd4 h1=Q
>>28:16 11/12 -Mate11 202470478 1...Rg3 2. b8=Q Rxb8 3. Kc5 h3
>> 4. Kd5 h2 5. Re1 g1=Q 6. Re5+ Kg6
>> 7. Re6+ Kf7 8. Kc4 Qc1+ 9. Kd4
>> Qc3+ 10. Kd5 h1=Q+ 11. Kd6 Rd3#
>>
>>At least it chose the right move the whole time....
>>
>>jm
>
>I believe that using bigger selectivity is better for finding mates faster.
>I always use ss=10 for chessmaster6000 because I believe based on my experience
>that ss=10 is simply faster in finding mates than ss=6.
>
>I do not have chessmaster8000 so I can only guess that ss=10 is better for mates
>problem.
Here is output for CM8000 with SS=10. I don't think it helps in this case.
Time Depth Score Positions Moves
8:39 10/11 -20.85 91605523 1...Rg3 2. Rd1 Rxb7 3. Rd5+ Ke4 4. Rd4+ Ke5
5. Rd5+ Ke6 6. Rd1 Rc7+ 7. Kb4 g1=Q 8. Rxg1
Rxg1 9. Ka3 h3 10. Ka4 h2 11. Ka5 h1=Q
I didn't wait for final solution.
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