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Subject: Re: Mate in 7 moves - double nullmove finds it

Author: Christophe Theron

Date: 00:10:53 09/28/00

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On September 27, 2000 at 10:50:45, Vincent Diepeveen wrote:

>On September 27, 2000 at 04:45:38, Eduard Nemeth wrote:
>
>>[D]8/8/p3R3/1p5p/1P5p/6rp/5K1p/7k w - - 0 1
>>
>>Shredder 4 and Fritz 6a this don't find !
>>
>>Eduard
>
>Diep with adaptive double nullmove pruning finds it easily:
>
>00:00 28 (0) 1 -5.83 Re6-e1 Rg3-g1 Re1-e7
>00:00 30 (0) 1 -4.73 Re6xa6
>00:00 76 (0) 2 -4.95 Re6xa6 Rg3-g1
>00:00 302 (0) 3 -4.75 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g1
>00:00 809 (0) 4 -4.58 Re6xa6 Rg3-g1 Ra6-a8 Rg1-g2 Kf2-f3
>00:00 2299 (0) 5 -4.53 Re6xa6 Rg3-g5 Ra6-a1 Rg5-g1 Ra1-a8 Rg1-g2 Kf2-f3 Rg2-g1
>00:00 4952 (443) 6 -4.52 Re6xa6 Rg3-g5 Ra6-a1 Rg5-g1 Ra1-a6 Rg1-g2 Kf2-f3 Rg2-g5
> Ra6-a1 Rg5-g1 Ra1-a7 Rg1-f1 Kf3-e4 Kh1-g2
>00:00 17457 (7143) 7 -4.97 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g5 Kf3-f4 Rg5-g1 Ra6-a2 Rg1-
>g2
>00:00 25462 (7420) 8 -4.58 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g5 Ra6-a1 Rg5-g1 Ra1-a8 Rg1-
>b1 Ra8-d8 Rb1-b3 Kf3-f2
>00:00 37460 (7816) 9 -4.65 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g5 Ra6-a1 Rg5-g1 Ra1-a8 Rg1-
>b1 Kf3-f2 Rb1-b2 Kf2-f3 Rb2-b3 Kf3-f2
>00:00 47849 (7967) 10 -4.49 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g5 Ra6-a1 Rg5-g1 Ra1-a8 Rg1
>-g3 Kf3-f2 Rg3-g4 Ra8-a1 Rg4-g1 Ra1-a5 Rg1-g2 Kf2-f3 Rg2-g5 Ra5-a1
>00:01 59178 (9578) 11 -4.49 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g5 Ra6-a1 Rg5-g1 Ra1-a8 Rg1
>-g3 Kf3-f2 Rg3-g4 Ra8-a1 Rg4-g1 Ra1-a5 Rg1-g2 Kf2-f3 Rg2-g5 Ra5-a1
>00:01 75500 (9982) 12 -4.49 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g5 Ra6-a1 Rg5-g1 Ra1-a8 Rg1
>-g3 Kf3-f2 Rg3-g2 Kf2-f3 Rg2-g1 Kf3-f4 Rg1-e1 Ra8-g8 Re1-f1 Kf4-e5 Rf1-b1
>00:01 119501 (14319) 13 -4.49 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g5 Ra6-a1 Rg5-g1 Ra1-a8 R
>g1-g3 Kf3-f2 Rg3-g2 Kf2-f3 Rg2-g1 Kf3-f2 Rg1-b1
>00:03 292790 (38137) 14 -4.92 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g5 Ra6-a1 Rg5-g1 Ra1-a8 R
>g1-f1 Kf3-e3 Rf1-f7 Ra8-g8 Rf7-c7 Ke3-f3 Rc7-c3 Kf3-f2 Rc3-c4 Kf2-f3 Rc4xb4 Rg8-
>b8
>00:04 522912 (63890) 15 -5.02 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g5 Ra6-a1 Rg5-g1 Ra1-a8 R
>g1-f1 Kf3-e3 Rf1-f7 Ra8-g8 Rf7-c7 Ke3-f3 Rc7-c3 Kf3-f2 Rc3-c4 Kf2-f3 Rc4-c3
>00:08 1121847 (89898) 16 -5.65 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g5 Ra6-a1 Rg5-g1 Ra1-a8
>Rg1-f1 Kf3-e3 Rf1-f7 Ra8-g8 Rf7-c7 Ke3-f3 Rc7-c3 Kf3-f2 Rc3-c4 Kf2-f3 Rc4xb4 Rg8
>-e8 Rb4-b3 Kf3-f2 Rb3-b2 Kf2-f3 Rb2-b1 Re8-d8
>00:15 2033969 (172871) 17 -5.66 Re6xa6 Rg3-g2 Kf2-f3 Rg2-g5 Ra6-a1 Rg5-g1 Ra1-a8
> Rg1-f1 Kf3-e3 Rf1-f7 Ra8-g8 Rf7-c7 Ke3-f3 Rc7-c3 Kf3-f2 Rc3-c4 Rg8-a8 Rc4-f4 Kf
>2-e2
>++ e6-e1
>00:15 2089162 (173038) 17 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:15 2098043 (173038) 18 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:16 2117322 (173800) 19 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:16 2136745 (174272) 20 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:16 2181692 (174281) 21 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:17 2240891 (174334) 22 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:17 2267612 (174522) 23 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:18 2301432 (174571) 24 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:18 2335058 (174627) 25 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:19 2414393 (174689) 26 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:20 2491663 (174752) 27 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:20 2530860 (174815) 28 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:21 2591785 (174879) 29 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:22 2663804 (174942) 30 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:23 2754707 (175006) 31 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:24 2822168 (175070) 32 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:25 2854728 (175133) 33 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:26 2915639 (175196) 34 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5
>b5-b4 a5-a6 b4-b3 a6-a7 b3-b2 a7-a8Q
>00:27 2975900 (175259) 35 MATE07 Re6-e1 Rg3-g1 Re1-f1 Rg1xf1 Kf2xf1 a6-a5 b4xa5



It took you 15 seconds to solve it?

I assume you were running Diep on an Apple II ? :)



    Christophe



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