Author: Heiner Marxen
Date: 10:11:02 06/10/01
Go up one level in this thread
On June 08, 2001 at 18:48:11, Eduard Nemeth wrote:
>I copy this game with FRITZ 6, then under Shredder 5 you can this analysis-game
>not played (20 knights)! Under Tiger "Lokasoft-Gui" You can a CBF-database with
>this games not load!
>
>20 Knights:
>[D]Nn1NN1NN/1NN4k/1N5n/8/8/N7/n4nK1/nnnn1nNn w - - 0 51
>
>20 Knights(51 moves) [A00]
>Zoltan Blazsik, 1997
>
>1.h4 g5 2.h5 g4 3.h6 Lg7 4.Th3 gxh3 5.hxg7 h5 6.b4 a5 7.b5 Ta6 8.bxa6 a4 9.a7 a3
>10.Lb2 axb2 11.a4 h2 12.g4 e5 13.f4 d5 14.e4 Le6 15.f5 h4 16.fxe6 f5 17.g5 h3
>18.c4 Dd6 19.c5 f4 20.cxd6 c5 21.Lc4 dxc4 22.d4 c3 23.d5 c4 24.Dd4 exd4 25.a5
>bxa1S 26.a8S c2 27.a6 c1S 28.a7 c3 29.gxh8S b5 30.Sb6 b4 31.a8S b3 32.Sa3 b2
>33.e5 b1S 34.g6 Sa2 35.g7 Sh6 36.g8S c2 37.d7+ Kf8 38.d8S c1S 39.e7+ Kg7 40.d6
>h1S 41.d7 h2 42.Sb7 d3 43.d8S d2+ 44.Kf1 f3 45.e8S+ Kh7 46.e6 f2 47.Kg2 d1S
>48.Sec7 f1S 49.e7 Shf2 50.e8S h1S 1-0
>
>or 0-1? :)
Just for fun I let Chest ponder this one a bit. First, let's search a mate
for white:
W: Kg2 Na3 Na8 Nb6 Nb7 Nc7 Nd8 Ne8 Ng1 Ng8 Nh8 (11)
B: Kh7 Na2 Na1 Nb8 Nb1 Nc1 Nd1 Nf2 Nf1 Nh6 Nh1 (11)
FEN: Nn1NN1NN/1NN4k/1N5n/8/8/N7/n4nK1/nnnn1nNn w - -
analysing (mate in 12 moves):
# 1 0.00s 0kN 0.87 1- 0
# 2 0.00s 0kN 0.99 1- 0
# 3 0.01s 0kN 0.91 33- 0
# 4 0.01s [ 1.00] 0kN 1.00 135- 0
# 5 0.02s [ 2.00] 1kN 1.23 311- 0
# 6 0.05s [ 2.50] 2kN 1.57 510- 0
# 7 0.07s [ 1.40] 5kN 1.99 920- 0
# 8 0.20s [ 2.86] 12kN 2.36 2079- 0
# 9 0.57s [ 2.85] 42kN 2.65 7038- 0
# 10 2.90s [ 5.09] 239kN 2.69 40558- 0
# 11 21.07s [ 7.27] 2163kN 2.88 291369- 0
# 12 146.80s [ 6.97] 14707kN 3.22 2156634- 94
No solution in 12 moves.
From the refutation table we see, that black is dangerous:
refu 1: Ngf6+ Kxh8 [ 11-]
refu 2: Nef6+ Kxh8 [ 11-]
refu 3: Nhf7 Nde3+ [ 63-]
refu 4: Ng6 Nde3+ [ 63-]
refu 5: Ne7 Nde3+ [ 11-]
refu 6: Nxh6 Nde3+ [ 11-]
refu 7: Ne2 Nde3+ [ 11-]
refu 8: Nf3 Nde3+ [ 63-]
refu 9: Nh3 Nde3+ [ 11-]
refu 10: Ned6 Nde3+ [ 11-]
refu 11: Ng7 Nde3+ [ 63-]
refu 12: Nc6 Nde3+ [ 63-]
refu 13: Nde6 Nde3+ [ 63-]
refu 14: Ndf7 Nde3+ [ 63-]
refu 15: Na6 Nde3+ [ 63-]
refu 16: Ncb5 Nde3+ [ 63-]
refu 17: Ncd5 Nde3+ [ 11-]
refu 18: Nce6 Nde3+ [ 63-]
refu 19: Na5 Nde3+ [ 63-]
refu 20: Nc5 Nde3+ [ 11-]
refu 21: Nbd6 Nde3+ [ 11-]
refu 22: Na4 Nde3+ [ 63-]
refu 23: Nc8 Nde3+ [ 63-]
refu 24: Nbc4 Nde3+ [ 11-]
refu 25: Nd7 Nde3+ [ 63-]
refu 26: Nbd5 Nde3+ [ 11-]
refu 27: Nab5 Nde3+ [ 63-]
refu 28: Nxb1 Nde3+ [ 11-]
refu 29: Nac4 Nde3+ [ 11-]
refu 30: Nc2 Nde3+ [ 11-]
refu 31: Kxf1 Ne3+ [ 63-]
refu 32: Kf3 Nfd2+ [ 11-]
Therefore I searched for a mate for black. Here is an extract:
After Ng8 - f6 ...
No solution in 12 moves.
After Ne8 - f6 ...
No solution in 12 moves.
After Nh8 - f7 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nf4+ Kh4 Nhf5#
After Nh8 - g6 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
After Ng8 - e7 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Ng2#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nf4+ Kh4 Neg2#
After Ng8 : h6 ...
Solution (in 6 moves):
PV: Nde3+ Kf3 Nbd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Ng2#
After Ng1 - e2 ...
Solution (in 6 moves):
PV: Nde3+ Kf3 Ncd3 Ngf6+ Kxh8 Nf7+ Nxf7 Nc3 Nfe5+ Ke2 Nhg3#
PV: Nbd2 Ngf6+ Kxh8 Nf7+ Nxf7 Nfd5 Nfe3+ Nxe3 Nxe3+ Kh2 Nf3#
After Ng1 - f3 ...
Solution (in 2 moves):
PV: Nde3+ Kg1 Ne2#
After Ng1 - h3 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nhg3+ Kh4 Nhf5#
After Ne8 - d6 ...
Solution (in 7 moves):
PV: Nde3+ Kf3 Nbd2+ Kf4 Ncd3+ Kg5 Nfe4+ Nxe4 Nxe4+ Kh5 Nf4+ Kh4 Nhf5#
After Ne8 - g7 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Ng2#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nf4+ Kh4 Neg2#
PV: Nbd2 Nf6+ Kxh8 Nf7+ Nxf7 Nfd5 Nfe3+ Nxe3 Nxe3+ Kh2 Ndf1#
After Nd8 - c6 ...
Solution (in 5 moves):
PV: Nbd2 Ngf6+ Kxh8 Nfd5 Nfe3+ Nxe3 Nxe3+ Kh2 Nhg4#
After Nd8 - e6 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
After Nd8 - f7 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nf4+ Kh4 Nhf5#
After Nc7 - a6 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nf4+ Kh4 Nhf5#
PV: Nbd2 Ngf6+ Kxh8 Nf7+ Nxf7 Nfd5 Nfe3+ Nxe3 Nxe3+ Kh2 Ndf1#
After Nc7 - b5 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nf4+ Kh4 Nhf5#
PV: Nbd2 Ngf6+ Kxh8 Nf7+ Nxf7 Nfd5 Nfe3+ Nxe3 Nxe3+ Kh2 Ndf1#
After Nc7 - d5 ...
Solution (in 9 moves):
PV: Nbd2 Ngf6+ Kxh8 Nf7+ Nxf7 Ng4 Ncd3 Nxf2 Ne1+ Kh3 Ndxf2+ Kh4 Nhg3 Ne3 Nef3+
Nxf3 Nxf3#
After Nc7 - e6 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
After Nb7 - a5 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nf4+ Kh4 Nhf5#
PV: Nbd2 Ngf6+ Kxh8 Nf7+ Nxf7 Nfd5 Nfe3+ Nxe3 Nxe3+ Kh2 Ndf1#
After Nb7 - c5 ...
Solution (in 6 moves):
PV: Nbd2 Ngf6+ Kxh8 Nf7+ Nxf7 Nfd5 Nfe3+ Nxe3 Nxe3+ Kh2 Ndf1#
After Nb7 - d6 ...
Solution (in 7 moves):
PV: Nde3+ Kf3 Nbd2+ Kf4 Ncd3+ Kg5 Nfe4+ Nxe4 Nxe4+ Kh5 Nf4+ Kh4 Nhf5#
After Nb6 - a4 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nf4+ Kh4 Nhf5#
PV: Nbd2 Ngf6+ Kxh8 Nf7+ Nxf7 Nfd5 Nfe3+ Nxe3 Nxe3+ Kh2 Ndf1#
After Nb6 - c8 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nf4+ Kh4 Nhf5#
PV: Nbd2 Ngf6+ Kxh8 Nf7+ Nxf7 Nfd5 Nfe3+ Nxe3 Nxe3+ Kh2 Ndf1#
After Nb6 - c4 ...
No solution in 12 moves.
After Nb6 - d7 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nf4+ Kh4 Nhf5#
After Nb6 - d5 ...
Solution (in 9 moves):
PV: Nbd2 Ngf6+ Kxh8 Nf7+ Nxf7 Ng4 Ncd3 Nxf2 Ne1+ Kh3 Ndxf2+ Kh4 Nhg3 Ne3 Nef3+
Nxf3 Nxf3#
After Na3 - b5 ...
Solution (in 6 moves):
PV: Nfe3+ Kf3 Nd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nde3+ Kf3 Nbd2+ Kf4 Nfd3+ Kg5 Ne4+ Kh5 Nf4+ Kh4 Nhf5#
PV: Ncd3 Ngf6+ Kxh8 Nf7+ Nxf7 Nfd7 Nfe3+ Kh2 Ne1 Nxb8 Nf1#
PV: Nbd2 Ngf6+ Kxh8 Nf7+ Nxf7 Nfd5 Nfe3+ Nxe3 Nxe3+ Kh2 Ndf1#
After Na3 : b1 ...
No solution in 12 moves.
After Na3 - c4 ...
Solution (in 8 moves):
PV: Nc2 Ngf6+ Kxh8 Nf7+ Nxf7 Ne4 Nde3+ Nxe3 Ncxe3+ Kf3 Nfd3 Nc4 Ne1+ Kf4 Ncd3#
After Na3 - c2 ...
Solution (in 7 moves):
PV: Nbd2 Ngf6+ Kxh8 Nf7+ Nxf7 Nfd5 Nxc2 Nf3 Nfe3+ Nxe3 Ndxe3+ Kh2 Nxf3#
PV: Nxc2 Ngf6+ Kxh8 Nh3 Nfe3+ Kh2 Nd2 Nf7+ Nxf7 Nxf2 Nf3+ Kh3 N7g5#
After Kg2 : f1 ...
Solution (in 2 moves):
PV: Ne3+ Ke1 Nfd3#
After Kg2 - f3 ...
Solution (in 5 moves):
PV: Nfd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
PV: Nbd2+ Kf4 Ncd3+ Kg5 Nde4+ Kh5 Nhg3+ Kh4 Nhf5#
Time (user) = 43197.71 sec (720.0 min) (12.0 hrs)
# 12 43197.71s 3018497kN 3.62 537582084- 528834183
So, 4 out of 32 legal moves white is lost, for the others may be not.
(12 hours on a K7/600 with 350 MB hash).
I have not yet tried the others ;-)
That was fun!
All those knights hunting a king gives some unusual mate patterns, like:
[D]Nn1NN1NN/1NN4k/1N6/5n2/4n2K/N2n2n1/n4n2/nn1n2N1 w - -
(This is from the Kf3-PV)
Cheers,
Heiner
This page took 0.01 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.