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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.
(Read Only)pid=13125
(2) Posted by Olaf Jenkner [Saturday, Jan 10, 2015 01:23]

You may ask here:
(Read Only)pid=13126
(3) Posted by Steffen Slumstrup Nielsen [Saturday, Jan 10, 2015 18:45]

It's won (in 44 moves) after 1...Qc4+
(Read Only)pid=13129
(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?
(Read Only)pid=13130
(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.
(Read Only)pid=13135

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MatPlus.Net Forum General 7 men EGTB