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MatPlus.Net Forum General 7 men EGTB
 
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(1) Posted by Sven Hendrik Lossin [Saturday, Jan 10, 2015 00:17]

7 men EGTB


I have Houdini 3 Aquarium. I just found out that there is no online access to the 7 men EGTB any longer :(
If somebody still has access, please tell me if the following position is won for black to move.
(= 5+2 )

Thanks in advance for your help.
 
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(2) Posted by Olaf Jenkner [Saturday, Jan 10, 2015 01:23]

You may ask here:

http://forum.computerschach.de/cgi-bin/mwf/board_show.pl?bid=1
 
 
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(3) Posted by Steffen Slumstrup Nielsen [Saturday, Jan 10, 2015 18:45]

It's won (in 44 moves) after 1...Qc4+
 
   
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(4) Posted by Siegfried Hornecker [Saturday, Jan 10, 2015 22:48]

That's interesting because I would have guessed the win consists of:
1) Bring the queen to e8
2) Bring the king to e8
3) Utilize Zugzwang to win the pawn on e7 or f2

Care to share the winning line with us?
 
   
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(5) Posted by Steffen Slumstrup Nielsen [Monday, Jan 12, 2015 16:47]

1...Qc4+ 2.Kd6 Qd4+ 3.Kc7 Qxe4 4.e7 Qa4 5.Kd6 Kc3 6.Ke6 Qe8 7.f4 Qg8+ 8.Kd6
Qg6+ 9.Kc7 Qe8 10.f5 Kd4 11.Kd6 Ke4 12.Ke6 Kf3 13.Bf6 Kg4 14.Bc3 Kh5 15.Bd2
Qg8+ 16.Kf6 Kg4 17.Bc1 Qh8+ 18.Ke6 Qc8+ 19.Kf6 Qxf5+ 20.Kg7 Qe6 21.Ba3 Kg5 22.
Bc1+ Kh5 23.Ba3 Qg6+ 24.Kf8 Kh6 25.Bb4 Qf6+ 26.Ke8 Kg6 27.Kd7 Qf5+ 28.Kd6 Qe4
29.Bc5 Kf7 30.Kc7 Qd5 31.Kb6 Qd7 32.Bb4 Kf6 33.e8R Qxe8 34.Bc3+ Kf5 35.Kc5 Ke4
36.Bd2 Qc8+ 37.Kd6 Qd8+ 38.Kc6 Qxd2 39.Kc5 Qd5+ 40.Kb6 Qd6+ 41.Kb5 Kd4 42.Ka4
Qb6 43.Ka3 Kc3 44.Ka2 Qb2# 0-1

That is the line provided, but 1... Qd1+ and 1... Qd2+ also wins. 2. Kd6 is mysterious. 2. Ke5 is answered by 2...Qc5+.

1... Qc8 is a draw after 2. e7.
 
 
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MatPlus.Net Forum General 7 men EGTB