Author: Robert Hyatt
Date: 13:29:39 03/02/99
Go up one level in this thread
On March 02, 1999 at 08:38:02, Steffen Jakob wrote:
>On March 02, 1999 at 08:13:02, Robert Hyatt wrote:
>
>>On March 01, 1999 at 18:44:51, Bruce Moreland wrote:
>>
>>>
>>>On March 01, 1999 at 15:46:14, Will Singleton wrote:
>>>
>>>>Well, that's an unexpected result. I ran this on Hiarcs, and after the
>>>>continuation (as above), it still has white down well over a pawn.
>>>>
>>>>So that begs the question, does Lambchop or Ferret actually see that the
>>>>position is drawn? Can a tablebase tell you that?
>>>
>>>After 1. Rxf5 Rxf5 2. Bxf5, black has to move somewhere and white simply plays
>>>Rxe2 on the next move, so you get Kxe2.
>>>
>>>The resulting KBP vs KR is drawn.
>>>
>>>The machine with the 5-man tables is busy right now. I did a probe to check to
>>>see that the position is drawn, but I can't check to see if a version actually
>>>using them at the tips knows for sure that that ending is drawn, but another
>>>version, which only has 4-man tables at its disposal, thinks it can get rid of
>>>the h-pawn, leading to a drawn KR vs KB.
>>>
>>>So yes, when I run this I get a contempt score back.
>>>
>>>If the position really isn't drawn I'm sure it will come to light and I'll look
>>>slightly stupid.
>>>
>>>bruce
>>
>>
>>nope.. you are correct... dead draw:
>>
>> 8 1.34 -0.37 1. Rg8 Kf2 2. Rgg1 f4 3. Rh1 f3 4.
>> h4 Rh5
>> 8 2.48 0.00 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+
>> Kxe2 <EGTB>
>> 8-> 3.20 0.00 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+
>> Kxe2 <EGTB>
>> 9 4.19 0.00 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+
>> Kxe2 <EGTB>
>> 9-> 6.49 0.00 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+
>> Kxe2 <EGTB>
>> 10 7.33 0.00 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+
>> Kxe2 <EGTB>
>
>What is crafty's evaluation without tablebases? :-)
>
>Greetings,
>Steffen.
looks like this:
1 0.00 3.16 1. Rxf5+ Rxf5 2. Bxf5
1 0.00 3.23 1. Bxf5
1-> 0.00 3.23 1. Bxf5
2 0.01 -- 1. Bxf5
2 0.01 2.43 1. Bxf5 Kf2
2-> 0.02 2.43 1. Bxf5 Kf2
3 0.02 -- 1. Bxf5
3 0.02 -1.75 1. Bxf5 Kf2 2. Rh1 e1=Q+ 3. Rxe1 Rxe1+
3 0.04 ++ 1. Rxf5+!!
3 0.04 -1.35 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1
3 0.04 ++ 1. h3!!
3 0.04 ++ 1. Rf6!!
3 0.04 ++ 1. Rf7!!
3 0.04 ++ 1. h4!!
3 0.05 ++ 1. Kb2!!
3 0.05 0.85 1. Kb2 Kf2 2. Kc3
3 0.05 1.04 1. Rg8 Kf2 2. Rgg1
3-> 0.05 1.04 1. Rg8 Kf2 2. Rgg1
4 0.06 0.89 1. Rg8 Kf2 2. Rgg1 Red5
4-> 0.07 0.89 1. Rg8 Kf2 2. Rgg1 Red5
5 0.08 1.03 1. Rg8 Kf2 2. Rgg1 Red5 3. h3
5-> 0.10 1.03 1. Rg8 Kf2 2. Rgg1 Red5 3. h3
6 0.11 -- 1. Rg8
6 0.13 0.17 1. Rg8 Kf2 2. Rgg1 Rh4 3. Kd2 Rxh2
6-> 0.17 0.17 1. Rg8 Kf2 2. Rgg1 Rh4 3. Kd2 Rxh2
7 0.19 ++ 1. Rg8!!
7-> 0.30 0.56 1. Rg8 Kf2 2. Rgg1 Rh4 3. Kd2 Rxh2
8 0.32 -- 1. Rg8
8 0.51 -0.37 1. Rg8 Kf2 2. Rgg1 f4 3. h4 f3 4. Rh1
Rh5
8-> 0.71 -0.37 1. Rg8 Kf2 2. Rgg1 f4 3. h4 f3 4. Rh1
Rh5
9 0.77 -- 1. Rg8
9 1.30 -2.57 1. Rg8 Kf2 2. Rgg1 Rc5 3. h4 Rdc4 4.
Rxe2+ Kxe2 5. Rg2+ Kf3 6. Rh2
9 1.79 ++ 1. Kb2!!
9 4.08 -1.64 1. Kb2 Kf2 2. Rxf5+ Rxf5 3. Rxe2+ Kxe2
4. Bxf5 Kf3 5. Kc3 Rd5 6. Bd3
9 4.29 -1.45 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rd5 6. Be4 Rd2
9-> 4.52 -1.45 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rd5 6. Be4 Rd2
10 4.67 -1.45 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rd2 6. Be4 Re2 7.
Bf3
10-> 5.61 -1.45 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rd2 6. Be4 Re2 7.
Bf3
11 5.89 -1.44 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rd2 6. Bg4 Rg2 7.
Bf3 Rd2
11-> 8.27 -1.44 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rd2 6. Bg4 Rg2 7.
Bf3 Rd2
12 8.80 -1.44 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rd2 6. Bg4 Rf2 7.
Bd1 Rd2 8. Bf3
12-> 13.12 -1.44 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rd2 6. Bg4 Rf2 7.
Bd1 Rd2 8. Bf3
13 14.58 -1.53 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rd2 6. Bg4 Rf2 7.
Bd7 Rh2 8. Bf5 Ke2
13-> 27.39 -1.53 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rd2 6. Bg4 Rf2 7.
Bd7 Rh2 8. Bf5 Ke2
14 32.87 -1.66 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rc4+ 6. Kb2 Kf2
7. Kb3 Rc5 8. Be6 Kg3 9. Kb4 Rc2
14-> 1:16 -1.66 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rh1 e1=Q+
4. Rxe1 Kxe1 5. h3 Rc4+ 6. Kb2 Kf2
7. Kb3 Rc5 8. Be6 Kg3 9. Kb4 Rc2
IE it doesn't see draw without the tablebases, but it finds that rxf5 is the
only reasonably choice pretty quickly.
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