Author: Miguel A. Ballicora
Date: 10:00:46 01/11/02
Go up one level in this thread
On January 11, 2002 at 12:47:29, David Rasmussen wrote:
>On January 11, 2002 at 12:40:03, Matthias Gemuh wrote:
>
>>On January 11, 2002 at 11:44:39, David Rasmussen wrote:
>>
>>>[D]2Q2n2/2R4p/1p1qpp1k/8/3P3P/3B2P1/5PK1/r7 w - - 0 1
>>>
>>>In the above position, my search tree explodes because of extensions. It takes >
>>>3 minutes and 42 million nodes to finish an 8 ply search. How does your program
>>>do?
>>>
>>>Any good ideas on how to limit extensions in such a position.
>>>
>>>P.S. Solving the position is no problem. It is a simple mate in 5 plies, and is
>>>found very early on at depth 1 or 2 or so. Still, there must be something
>>>unsound about my extensions, or at least room for improvement, when this
>>>position makes the tree explode.
>>>
>>>/David
>>
>>
>>
>>
>>My HyLogicChess has the following stats:
>>All extensions active.
>>Quiescence moves: 29% (no explosion, my average is normally have 40%)
>>Total moves searched: 11000
>>Speed; 84 kN/s
>>Move Ordering: 78% (normally 90%..92%)
>>[1] (0.18) 1.f3 (00h:00m:00s)
>>[2] (0.12) 1.Qb7 e5 (00h:00m:00s)
>>[3] (14.50) 1.Qxf8 Kh5 2.Rxh7 Kg4 3.Qxd6 (00h:00m:00s)
>>[4] (+Mate in 3) 1.Qxf8 Kh5 2.Rxh7 Kg4 3.f3 (00h:00m:00s)
>
>My program performs similarly if only searching to ply 4, but try letting it
>search to ply 9, even though it has already found the mate. That is what I am
>talking about.
>
>/David
Gaviota's output:
setboard 2Q2n2/2R4p/1p1qpp1k/8/3P3P/3B2P1/5PK1/r7 w - - 0 1
d
+-----------------+
| . . Q . . n . . |
| . . R . . . . x |
| . x . q x x . k |
| . . . . . . . . |
| . . . o . . . o |
| . . . B . . o . |
| . . . . . o K . |
| r . . . . . . . |
+-----------------+
sd 9
go
104 1: 0.0 +30.78 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8xd6
392 2: 0.0 +30.78 Qc8xf8 Kh6-h5 Rc7xh7 <EMPTY>
<-transp
455 3 0.0 :-) Qc8xf8
530 3 0.0 :-) Qc8xf8
565 3 0.0 :-) Qc8xf8
1637 3 0.0 :-) Qc8xf8
3104 3: 0.0 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
4023 4 0.1 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
4475 4: 0.1 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
5444 5 0.1 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
8853 5: 0.1 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
11891 6 0.1 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
18148 6: 0.2 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
24692 7 0.2 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
48189 7: 0.4 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
62166 8 0.6 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
152926 8: 1.5 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
172449 9 1.6 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
262305 9: 2.3 +Mat_3 Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4
Qf8-g8
Ply: 9
Qc8xf8 Kh6-h5 Rc7xh7 Kh5-g4 Qf8-g8
Score: 125.37 (32094) Evals: 90689 Time: 2.3s nps: 115400 Q/all: 0.36
nodes cutoffs missed tree_exp
path 168830 26576 823 1.03
quies 93475 31592 1083 1.03
all 262305 58168 1906 1.03
hashtable= attempts: 284553 hits: 35.3% perfect: 23.2%
move c8f8
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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