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Subject: Re: Two Test Positions = Queen and Pawn Endings

Author: Robert Hyatt

Date: 20:43:48 04/30/04

Go up one level in this thread


On April 30, 2004 at 17:21:34, José Antônio Fabiano Mendes wrote:

> [D]7k/6p1/2P3Qp/p3q2P/8/6P1/5K2/8 w
> Bogoljubow vs Stahlberg, Kemeri 1933  1. Qc2!! Qxh5 2. Qc4!

This one takes crafty depth=16, not real quick.  Almost 4 minutes to pick Qc2,
several more to see how good it really is...




               14    31.80   0.27   1. Kg2 Qe2+ 2. Kh3 Qf3 3. Kh4 a4 4.
                                    Qc2 Qf6+ 5. Kh3 Qe6+ 6. Kg2 Qd5+ 7.
                                    Kf2 Qf7+ 8. Ke3 Qe7+ 9. Kd4 Qd6+ 10.
                                    Ke4 Qe6+ 11. Kf4 a3
               14->  48.91   0.27   1. Kg2 Qe2+ 2. Kh3 Qf3 3. Kh4 a4 4.
                                    Qc2 Qf6+ 5. Kh3 Qe6+ 6. Kg2 Qd5+ 7.
                                    Kf2 Qf7+ 8. Ke3 Qe7+ 9. Kd4 Qd6+ 10.
                                    Ke4 Qe6+ 11. Kf4 a3 (s=5)
               15    53.12   0.01   1. Kg2 Qe2+ 2. Kh3 Qf3 3. Kh4 Qd5 4.
                                    Kg4 a4 5. c7 Qc4+ 6. Kf5 Qxc7 7. Qe8+
                                    Kh7 8. Qg6+ Kg8 9. Qe8+ Kh7 (s=4)
               15->   2:45   0.01   1. Kg2 Qe2+ 2. Kh3 Qf3 3. Kh4 Qd5 4.
                                    Kg4 a4 5. c7 Qc4+ 6. Kf5 Qxc7 7. Qe8+
                                    Kh7 8. Qg6+ Kg8 9. Qe8+ Kh7 (s=8)
               16     2:49   0.01   1. Kg2 Qe2+ 2. Kh3 Qf3 3. Kh4 Qd5 4.
                                    Kg4 a4 5. c7 Qc4+ 6. Kf5 Qxc7 7. Qe8+
                                    Kh7 8. Qg6+ Kg8 9. Qe8+ Kh7 (s=7)
               16     3:52     +1   1. Qc2!!
               16     4:19   0.38   1. Qc2 Qxh5 2. Qc4 Qh2+ 3. Kf3 Qh1+
                                    4. Kf4 Qh5 5. c7 Qg5+ 6. Ke4 Qg4+ 7.
                                    Kd5 Qd7+ 8. Ke5 Qe7+ 9. Kf5 Qf8+ 10.
                                    Ke4 Qc8 11. Ke5 a4 12. Kd4 <HT> (s=6)
               16->   4:55   0.38   1. Qc2 Qxh5 2. Qc4 Qh2+ 3. Kf3 Qh1+
                                    4. Kf4 Qh5 5. c7 Qg5+ 6. Ke4 Qg4+ 7.
                                    Kd5 Qd7+ 8. Ke5 Qe7+ 9. Kf5 Qf8+ 10.
                                    Ke4 Qc8 11. Ke5 a4 12. Kd4 <HT> (s=2)
               17     6:54     +1   1. Qc2!!
               17    10:07   1.10   1. Qc2 Qxh5 2. Qc4 a4 3. c7 Qf5+ 4.
                                    Ke3 Qc8 5. Kd4 Kh7 6. Kc3 Kh8 7. g4
                                    a3 8. Kb3 Kh7 9. Qd3+ g6 10. Qd8 a2
                                    11. Qxc8 a1=Q



>
> [D]8/8/p7/2Q5/1P6/1P3qp1/3k4/6K1 b
> Grigoriev 1930  1...Kd1!
> The immediate transposition into a pawn ending leads only to a draw.


This one is trivial...  2.47 seconds.

                9     2.47     +1   1. ... Kd1!!
                9     2.59     +3   1. ... Kd1!!
                9     2.66  -4.88   1. ... Kd1 2. Qd6+ Kc2 3. Qb6 Kxb3
                                    4. Qe6+ Kb2 5. Qe5+ Kc2 6. Qe1 Qd1
                                    7. Kf1 Qxe1+ 8. Kxe1
                9->   2.66  -4.88   1. ... Kd1 2. Qd6+ Kc2 3. Qb6 Kxb3
                                    4. Qe6+ Kb2 5. Qe5+ Kc2 6. Qe1 Qd1
                                    7. Kf1 Qxe1+ 8. Kxe1 (s=7)
               10     2.80     +1   1. ... Kd1!!
               10     2.82     +3   1. ... Kd1!!
               10     2.90  -7.03   1. ... Kd1 2. Qa7 Kc2 3. Qh7+ Kb2 4.
                                    Qh3 Qf2+ 5. Kh1 Qh2+ 6. Qxh2+ gxh2
                                    7. Kxh2 Kxb3 8. Kg1 Kxb4 9. Kf2 (s=6)
               10->   3.19  -7.03   1. ... Kd1 2. Qa7 Kc2 3. Qh7+ Kb2 4.
                                    Qh3 Qf2+ 5. Kh1 Qh2+ 6. Qxh2+ gxh2
                                    7. Kxh2 Kxb3 8. Kg1 Kxb4 9. Kf2 (s=2)
               11     3.41  -7.05   1. ... Kd1 2. Qa7 Kc2 3. Qb6 <HT>
               11->   3.83  -7.05   1. ... Kd1 2. Qa7 Kc2 3. Qb6 <HT> (s=2)
               12     4.78  -7.02   1. ... Kd1 2. Qa7 Kc2 3. Qh7+ Kb2 4.
                                    Qh3 Qf2+ 5. Kh1 Qh2+ 6. Qxh2+ gxh2
                                    7. Kxh2 Kxb3 8. Kg1 Kxb4 9. Kf2 a5
                                    10. Ke3
               12->   5.58  -7.02   1. ... Kd1 2. Qa7 Kc2 3. Qh7+ Kb2 4.
                                    Qh3 Qf2+ 5. Kh1 Qh2+ 6. Qxh2+ gxh2
                                    7. Kxh2 Kxb3 8. Kg1 Kxb4 9. Kf2 a5
                                    10. Ke3 (s=2)
               13     5.81     +1   1. ... Kd1!!
               13     6.37     +3   1. ... Kd1!!
               13     6.86     +M   1. ... Kd1!!



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