Author: Robert Hyatt
Date: 15:30:40 04/11/01
Go up one level in this thread
On April 11, 2001 at 16:33:46, Peter McKenzie wrote:
>On April 11, 2001 at 16:01:43, Robert Hyatt wrote:
>
>>On April 11, 2001 at 15:32:49, Uri Blass wrote:
>>
>>>[D]8/p4k2/1p1p1qp1/1P1P4/P5P1/7P/4Q1K1/2b5 b - - 0 1
>>>
>>>The test is to avoid Qb2
>>>
>>>Most programs have no problem to avoid Qb2 but I suspect that this mistake is
>>>typical for Junior(I have not the latest version and it is interesting to know
>>>if Junior can avoid Qb2 and how much time does it need).
>>>
>>>I played Qb2 in a tournament game today and had to agree to a draw after Qxb2
>>>Bxb2 g5.
>>>
>>>It was my mistake to use only about 1 minute for 39...Qb2 when
>>>I had about 6 minutes for moves 39-40.
>>>
>>>I thought that 39...Qb2 is winning the game.
>>>Unfortunately I calculated only the line 39...Qb2 40.Qxb2 Bxb2 41.Kf3
>>>
>>>Uri
>>
>>
>>Crafty doesn't consider Qb2 at all:
>
>Hi Bob, what is crafty's score after Qb2? I know that my program doesn't
>understand this at all, does crafty have some understanding of the drawbacks of
>Qb2?
>
Here is the output:
14-> 1.35 -1.72 1. ... Qb2 2. Qxb2 Bxb2 3. g5 Bc1 4.
h4 Bf4 5. Kh3 Be3 6. Kg4 Bc1 7. h5
Bxg5 8. Kxg5 gxh5 9. Kxh5
15 2.65 -1.86 1. ... Qb2 2. Qxb2 Bxb2 3. g5 Bc1 4.
h4 Bf4 5. Kh3 Be3 6. Kg4 Bc1 7. Kf3
Bb2 8. Ke3 Bc3 9. Ke4
15-> 2.65 -1.86 1. ... Qb2 2. Qxb2 Bxb2 3. g5 Bc1 4.
h4 Bf4 5. Kh3 Be3 6. Kg4 Bc1 7. Kf3
Bb2 8. Ke3 Bc3 9. Ke4
16 5.91 -1.86 1. ... Qb2 2. Qxb2 Bxb2 3. g5 Bc1 4.
h4 Bf4 5. Kh3 Be3 6. Kg4 Bc1 7. Kf3
Bb2 8. Kg4 Bd4 9. Kg3 <HT>
16-> 5.92 -1.86 1. ... Qb2 2. Qxb2 Bxb2 3. g5 Bc1 4.
h4 Bf4 5. Kh3 Be3 6. Kg4 Bc1 7. Kf3
Bb2 8. Kg4 Bd4 9. Kg3 <HT>
17 18.04 -1.86 1. ... Qb2 2. Qxb2 Bxb2 3. g5 Bc1 4.
h4 Bf4 5. Kh3 Be3 6. Kg4 Bc1 7. Kf3
Bb2 8. Kg4 Bd4 9. Kg3 Kg7 10. Kf4
17-> 18.04 -1.86 1. ... Qb2 2. Qxb2 Bxb2 3. g5 Bc1 4.
h4 Bf4 5. Kh3 Be3 6. Kg4 Bc1 7. Kf3
Bb2 8. Kg4 Bd4 9. Kg3 Kg7 10. Kf4
That is from telling it to _only_ consider Qb2...
>>
>> (2) 7-> 0.29 -3.18 1. ... Bf4 2. Qc4 Qe5 3. Qc7+ Kf6 4.
>> Qd8+ Kg7 5. Qd7+ Kh6 6. Kf3
>> 8 0.47 -3.33 1. ... Bf4 2. Qe4 Qb2+ 3. Kf3 Be5 4.
>> Ke3 Qb3+ 5. Ke2 Qxh3 6. Qf3+ Qxf3+
>> 7. Kxf3 Ke7
>> 8-> 0.55 -3.33 1. ... Bf4 2. Qe4 Qb2+ 3. Kf3 Be5 4.
>> Ke3 Qb3+ 5. Ke2 Qxh3 6. Qf3+ Qxf3+
>> 7. Kxf3 Ke7
>> 9 0.93 -3.02 1. ... Bf4 2. Qe6+ Qxe6 3. dxe6+ Kxe6
>> 4. h4 Ke5 5. Kf3 d5 6. h5 gxh5 7. gxh5
>> 9 1.89 -3.17 1. ... Bg5 2. Qf2 Bh4 3. Qxf6+ Kxf6
>> 4. Kf3 Ke5 5. Ke3 g5 6. a5 Kxd5 7.
>> axb6 axb6
>> (4) 9-> 2.29 -3.17 1. ... Bg5 2. Qf2 Bh4 3. Qxf6+ Kxf6
>> 4. Kf3 Ke5 5. Ke3 g5 6. a5 Kxd5 7.
>> axb6 axb6
>> (3) 10 2.65 -3.33 1. ... Bg5 2. Qf2 Bf4 3. Kf3 g5 4.
>> Qc2 Qh8 5. Qc7+ Kf6 6. Qxa7 Qxh3+ 7.
>> Ke4
>> 10-> 2.93 -3.33 1. ... Bg5 2. Qf2 Bf4 3. Kf3 g5 4.
>> Qc2 Qh8 5. Qc7+ Kf6 6. Qxa7 Qxh3+ 7.
>> Ke4
>> 11 4.95 -3.44 1. ... Bg5 2. Qf2 Bh4 3. Qxf6+ Kxf6
>> 4. Kf3 Ke5 5. Ke2 Kxd5 6. Kf3 g5 7.
>> 11-> 5.89 -3.44 1. ... Bg5 2. Qf2 Bh4 3. Qxf6+ Kxf6
>> 4. Kf3 Ke5 5. Ke2 Kxd5 6. Kf3 g5 7.
>> Ke3 Bg3
>> 12 8.18 -3.45 1. ... Bg5 2. Qf2 Bh4 3. Qxf6+ Kxf6
>> 4. Kf3 Ke5 5. Ke2 Bf6 6. Ke3 g5 7.
>> Kf3 Kxd5 8. Ke3
>> (2) 12-> 11.81 -3.45 1. ... Bg5 2. Qf2 Bh4 3. Qxf6+ Kxf6
>> 4. Kf3 Ke5 5. Ke2 Bf6 6. Ke3 g5 7.
>> Kf3 Kxd5 8. Ke3
>> 13 23.08 -3.62 1. ... Bg5 2. Qf2 Bh4 3. Qxf6+ Kxf6
>> 4. Kf3 Ke5 5. Ke2 Kxd5 6. Kd3 Ke5 7.
>> Kc4 d5+ 8. Kd3 g5 9. Ke3
>> 13-> 33.00 -3.62 1. ... Bg5 2. Qf2 Bh4 3. Qxf6+ Kxf6
>> 4. Kf3 Ke5 5. Ke2 Kxd5 6. Kd3 Ke5 7.
>> Kc4 d5+ 8. Kd3 g5 9. Ke3
>> 14 44.57 -3.71 1. ... Bg5 2. Qf2 Bh4 3. Qxf6+ Kxf6
>> 4. Kf3 Ke5 5. Ke2 Kxd5 6. Kd3 g5 7.
>> Ke3 Kc4 8. Ke4 d5+ 9. Ke5 d4
>> 14-> 49.67 -3.71 1. ... Bg5 2. Qf2 Bh4 3. Qxf6+ Kxf6
>> 4. Kf3 Ke5 5. Ke2 Kxd5 6. Kd3 g5 7.
>> Ke3 Kc4 8. Ke4 d5+ 9. Ke5 d4
>>
>>However, the temptation to trade queens when ahead in material is pretty
>>strong, and it thinks that queens will be traded a couple of moves later.
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