Author: Mikael Bäckman
Date: 03:26:17 09/11/04
Go up one level in this thread
On September 10, 2004 at 10:18:30, Mihaly Szalai wrote:
>From the game Jung - Szabados (1952)
>
>[D]8/6B1/p5p1/Pp4kp/1P5r/5P1Q/4q1PK/8 w - - 0 32
>
>32. Qxh4! Kxh4 33. Bf6+ g5 34. Bc3!!
>
>Hiarcs 9 have problems with it even after 20 minutes.
>
>Show it to your engine.
>
>Thanks
>Mihaly
I recently started playing around with verified nullmove pruning in Chepla. In
this position the difference between what I normally use (adaptive R=2/3) and
VNMP is huge: 6 plies!
With R=2/3:
-0.18 2193k 3.0 Bh6+ Kxh6 Qxh4 Qe5+ Kg1 Qe3+ Kf1 Kg7 Qe4 Qxe4 fxe4 Kf6
Ke2 Ke5 11/25
-0.17 3065k 4.3 Bh6+ Kxh6 Qxh4 Qe5+ Kg1 Kg7 Kf2 Kf7 Qe4 Kf6 Qxe5+ Kxe5
Ke3 g5 g3 12/26
-0.12 6047k 8.5 Bh6+ Kxh6 Qxh4 Qe5+ Kg1 Qe3+ Kf1 Qc1+ Kf2 Qd2+ Kf1 Qd3+
Kg1 Kg7 Qe7+ Kh6 Kf2 g5 Qe4 Kg7 13/29
0.16 9534k 13.0 Qh3xh4+! Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qd4 Bxd4 g4 13/22
1.16 9558k 13.0 Qh3xh4+! Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qd4 Bxd4 g4 13/21
4.29 10216k 13.8 Qh3xh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 f4 g3 f5
Kg5 f6 Kg6 Kf1 Kf7 Ke2 Ke6 14/26
4.29 12905k 16.7 Qh3xh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 f4 g3 f5
Kg5 f6 Kg6 Kf1 Kf7 Ke2 Ke6 15/28
With VNMP:
-0.19 4k 0.0 Bh6+ Kxh6 Qxh4 Qe5+ Kg1 Kg7 Kf2 5/11
-0.27 15k 0.0 Bh6+ Kxh6 Qxh4 Qe5+ Kg1 Kg7 Kf2 Kf7 6/15
-0.27 53k 0.1 Bh6+ Kxh6 Qxh4 Qe5+ Kg1 Qe3+ Kh2 Kg7 Qe4 Qc3 7/17
0.06 115k 0.2 Qh3xh4+! Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qd4 Bxd4 g4 fxg4 7/18
1.06 117k 0.2 Qh3xh4+! Kxh4 Bf6+ g5 Bc3 Qe5+ Bxe5 g4 fxg4 hxg4 g3+ Kg5
Kg1 7/17
3.86 158k 0.3 Qh3xh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 Kf2 Kg5
f4+ Kf5 Ke3 8/22
3.86 359k 0.6 Qh3xh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 Kf2 Kg5
f4+ Kf5 Ke3 9/27
4.10 996k 1.6 Qh3xh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 f4 g3 f5
Kg5 f6 10/26
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