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Subject: Re: Simple end position but surprisingly difficult for some programs

Author: Robert Hyatt

Date: 11:57:53 04/22/02

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On April 21, 2002 at 11:27:05, Ferdinand S. Mosca wrote:

>
>Hello,
>
>White to play and win. How long will your favorite engines like 1. Qxe5?
>
>Regards,
>Dinan
>
>8/8/5kp1/4qp1p/1P6/2Q3P1/5P2/6K1 w - - 0 47

Instantly for me...

specific endgame knowledge helps here...

                1     0.00   0.44   1. Qxe5+ Kxe5 2. f4+
                1->   0.00   0.44   1. Qxe5+ Kxe5 2. f4+
                2     0.00   0.65   1. Qxe5+ Kxe5 2. f4+ Kd4 3. b5
                2->   0.00   0.65   1. Qxe5+ Kxe5 2. f4+ Kd4 3. b5
                3     0.00   0.75   1. Qxe5+ Kxe5 2. f4+ Kd4 3. b5 Kd5
                3->   0.00   0.75   1. Qxe5+ Kxe5 2. f4+ Kd4 3. b5 Kd5
                4     0.00   0.95   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Ke4
                                    4. b5
                4->   0.01   0.95   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Ke4
                                    4. b5
                5     0.01   1.05   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Ke4
                                    4. b5 Kd5
         (2)    5->   0.02   1.05   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Ke4
                                    4. b5 Kd5
                6     0.02   1.14   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Kd5
                                    4. b5 Kc5 5. Ke3 Kxb5
         (2)    6->   0.04   1.14   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Kd5
                                    4. b5 Kc5 5. Ke3 Kxb5
                7     0.05   0.94   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Kc4
                                    4. b5 Kxb5 5. Ke3 Kc4
         (2)    7->   0.07   0.94   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Kc4
                                    4. b5 Kxb5 5. Ke3 Kc4
                8     0.10   1.14   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Kd5
                                    4. b5 Kd6 5. b6 Kc6 6. Ke3 Kxb6
         (2)    8->   0.14   1.14   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Kd5
                                    4. b5 Kd6 5. b6 Kc6 6. Ke3 Kxb6
                9     0.18   1.04   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Kc4
                                    4. Ke3 Kxb4 5. Kd4 Kb3 6. Ke5 Kc2
         (2)    9->   0.32   1.04   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Kc4
                                    4. Ke3 Kxb4 5. Kd4 Kb3 6. Ke5 Kc2
               10     0.41   1.14   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Kc4
                                    4. Ke3 Kxb4 5. Kd4 Kb3 6. Kd3 Kb2 7.
                                    Ke3
         (2)   10->   0.60   1.14   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Kc4
                                    4. Ke3 Kxb4 5. Kd4 Kb3 6. Kd3 Kb2 7.
                                    Ke3
               11     0.76   0.94   1. Qxe5+ Kxe5 2. f4+ Kd4 3. Kf2 Kc4
                                    4. Ke3 Kxb4 5. Kd4 Kb3 6. Kd3 Kb2 7.
                                    Ke3 Kc2



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