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Subject: Re: A test position for chess programs

Author: John Merlino

Date: 12:57:43 04/11/01

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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

It takes CM8000 a little while to find something better than Qb2:

Time	Depth	Score	Positions	Moves
0:00	2/6	-3.02	18847		1...Qb2 2. Qxb2 Bxb2 3. Kf3 Bc3
					4. Ke4 g5
0:01	3/7	-3.07	47470		1...Qb2 2. Qxb2 Bxb2 3. Kf3 g5
					4. Ke3 Bc3 5. Ke4
0:02	4/8	-3.11	185954		1...Qb2 2. Qxb2 Bxb2 3. g5 Bc3
					4. Kf3 Bd2 5. h4 Be1
0:07	5/9	-3.15	703620		1...Qb2 2. Qxb2 Bxb2 3. g5 Bc3
					4. Kg3 Ke7 5. Kf3 Bd2 6. h4
0:31	6/10	-3.08	3086042		1...Qb2 2. Qxb2 Bxb2 3. g5 Bc3
					4. Kg3 Ke7 5. h4 Bb4 6. Kf4 Be1
2:14	7/11	-3.05	12606141	1...Qb2 2. Qxb2 Bxb2 3. g5 Bc3
					4. Kg3 Ke7 5. h4 Kd8 6. Kg4 Kd7
					7. h5
4:19	7/11	-3.42	21794306	1...Kg7 2. Qc2 Be3 3. Qe2 Qd4 4.
					Qf3 Qd2+ 5. Kf1 Qd3+ 6. Ke1 Bd2+
					7. Kf2 Be1+ 8. Kg2 Qc2+ 9. Kf1
					Bh4 10. Kg1 Qxa4

jm



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