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Subject: Can anyone find this Mate in Eight?

Author: tony worsman

Date: 08:55:01 04/08/00

Hi Folks,
Ive been trying to find the solution to this endgame study
for a couple of days now,
A direct mate in 8 apparently, The study is by Helmut KLUG and
Wolfgang BOR from 1976.


r7/p1pRpP1n/K3Pp1b/5B1n/4NkP1/2B5/2N1Pp2/1b6 w - -

Amy favours Bd2+, as do all the programs i've used:-


10    2:47     +++  1. Nxf2
10    3:45  +5.328  1. Nxf2 Ng5 2. Nd3+ Kg3 3. Na3 Ba2 4. gxh5 Bxe6 5. Bxe6
                    Nxe6 6. Rxe7
10    4:03     +++  1. Bd2+
10    5:50  +5.336  1. Bd2+ Ke5 2. Rd3 f1=Q 3. Bc3+ Kf4 4. e3+ Kf3 5. Nd2+
                    Kg3 6. Nxf1+ Kg2 7. Be1
10    8:01  +5.336  1. Bd2+ Ke5 2. Rd3 f1=Q 3. Bc3+ Kf4 4. e3+ Kf3 5. Nd2+
                    Kg3 6. Nxf1+ Kg2 7. Be1
11    9:23     +++  1. Bd2+
11   15:46  +6.032  1. Bd2+ Ke5 2. Nxf2 Bxc2 3. Bc3+ Kf4 4. Bxc2 Ng3 5. Bxh7
                    Ke3 6. Bd2+ Kxf2
11   22:21  +6.032  1. Bd2+ Ke5 2. Nxf2 Bxc2 3. Bc3+ Kf4 4. Bxc2 Ng3 5. Bxh7
                    Ke3 6. Bd2+ Kxf2
12   40:08  +6.160  1. Bd2+ Ke5 2. Nxf2 Bxc2 3. Bc3+ Kf4 4. Bxc2 Ng7 5. Bxh7
                    Nxe6 6. Bd2+ Kg3 7. Ne4+ Kxg4
12   61:07  +6.160  1. Bd2+ Ke5 2. Nxf2 Bxc2 3. Bc3+ Kf4 4. Bxc2 Ng7 5. Bxh7
                    Nxe6 6. Bd2+ Kg3 7. Ne4+ Kxg4
Nodes = 251089260, QPerc: 53 %, time = 10800 secs, 23.2 kN/s
Extensions: Check: 43061050  DblChk: 476724  DiscChk: 3367359  SingReply:
3235142
            Recapture: 1904421   Passed Pawn: 114340   Zugzwang: 0
Hashing: Trans: 4704498/116504568 = 4 %   Pawn: 95869890/96020430 = 10 %
         Eval: 38272659/134293089 = -3 %
EGTB Hits/Probes = 0/0
Hashtable 1:  entries = 524288, use = 492978


And here is the end of SOS's debug file after 20 hours on the job, yet no mate.
Using a P1-200MMX.


71920040 <first :   15   1022 7181475 3121836329 Bd2+ Ke5 Ba5 Rc8 f8Q f1Q Bc3+
Kf4 Qxh6+ Ng5 Nxg5 fxg5 gxh5 Kg3 Qxg5+ Kh2 Kxa7   (44 knps)
72234160 <first :   15   1023 7212892 3134278845 Bd2+ Ke5 Ba5 Rc8 f8Q f1Q Bc3+
Kf4 Qxh6+ Ng5 Nxg5 fxg5 gxh5 Kg3 Qxg5+ Kh2 Kxa7   (44 knps)
72541690 <first :   15   1024 7243645 3146138431 Bd2+ Ke5 Ba5 Rc8 f8Q f1Q Bc3+
Kf4 Qxh6+ Ng5 Nxg5 fxg5 gxh5 Kg3 Qxg5+ Kh2 Kxa7   (44 knps)
72856630 <first :   15   1025 7275139 3158368629 Bd2+ Ke5 Ba5 Rc8 f8Q f1Q Bc3+
Kf4 Qxh6+ Ng5 Nxg5 fxg5 gxh5 Kg3 Qxg5+ Kh2 Kxa7   (44 knps)
72906450 >first : exit
72906510 >first : force
72906560 <first : Stopped by user input
72906560 <first :  PV: (1025) c3d2 f4e5 d2a5 a8c8 f7f8q f2f1q a5c3 e5f4 f8h6
h7g5 e4g5 f6g5 g4h5 f4g3 h6g5 g3h2 a6a7
72906620 <first :    time used: 20:13:21

I would be interested if anyone can find a mate in 8 here

Regards and Happy Hunting :o)

Tony Worsman

Re: Can anyone find this Mate in Eight? John Merlino 11:02:06 04/10/00
Re: Can anyone find this Mate in Eight? Bernhard Bauer 23:51:16 04/09/00
Re: Can anyone find this Mate in Eight? William Kerr 15:12:33 04/08/00
- Re: Can anyone find this Mate in Eight? William Kerr 15:15:05 04/08/00
Junior 6a finds Mate in Eight in 2 minutes. Timothy J. Frohlick 12:42:07 04/08/00
Re: Can anyone find this Mate in Eight? Christophe Theron 11:57:42 04/08/00
Re: Can anyone find this Mate in Eight? (yes) Heiner Marxen 11:54:27 04/08/00
Re: Can anyone find this Mate in Eight? James T. Walker 09:40:03 04/08/00
- Re: Can anyone find this Mate in Eight? Christophe Theron 11:13:11 04/08/00
- Re: Can anyone find this Mate in Eight? tony worsman 09:47:38 04/08/00
Re: Can anyone find this Mate in Eight? Timothy J. Frohlick 09:25:49 04/08/00

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