Author: Robert Hyatt
Date: 12:58:13 02/11/03
Go up one level in this thread
On February 11, 2003 at 08:46:55, Sune Fischer wrote:
>On February 11, 2003 at 07:43:44, Uri Blass wrote:
>
>>>[D]r2r2k1/p1p2pbp/nq4p1/1p1bp3/1P1P2P1/P3P2P/2BN1P2/R1BQ1RK1 w - e6 0 18
>>>
>>>Nb3 is suggested by crafty, ruffy and many others, frenzee wants to play e4. Of
>>>course I'm not surprised it can't find the right move if it can't give a correct
>>>score (or is it the other way around?:). Something must be broken, I just tested
>>>and it's not related to nullmove or lazy eval.. :(
>>>
>>>-S.
>>
>>Are you sure that Nb3 is the right move
>>The score is clearly negative for white but
>>Movei also likes e4(latest movei find it faster than the public Movei but both
>>find e4 after enough search time).
>>
>>Uri
>
>Oh well, sometimes you find the right move for the wrong reasons, seems ruffian
>also changed after a while to e4.
>
>I did find one bug though, the knight tables were being multiplied with a factor
>5, I forgot all about that. It was just a quick test to adjust all piece square
>scores at once, but seems I forgot to remove it, no wonder evaluation was off.
>
>However I now found a new bug!
>
>I have turned off everything, killers, hashtable, nullmove, using only material
>eval and I get this
>
>1 0 0 3 1.dxe5 Bxe5
>2 0 0 79 1.dxe5 Bxe5
>3 0 1 521 1.dxe5 Bxe5 2.Rb1
>4 165 1 3608 1.dxe5 Nb3
>5 335 4 22022 1.dxe5 e4
>6 380 11 81855 1.dxe5 Nf3
>7 435 43 373682 1.dxe5 e4
>8 165 284 2628534 1.dxe5 e4
>9 165 986 9151622 1.dxe5 e4
>
>white is better by up to 4.35 pawns and dxe5 Nf3 is illegal.
>
>I dont know what is going on here....
>
>-S.
I'm not sure whether you still want me to play with the aspiration window
and post results or not. I ran this on my laptop and got Nb3 every time,
with a score of about -1.0:
7-> 1.60 -1.03 1. Nb3 Qf6 2. Bb2 Bf3 3. Qd3 Qc6 4.
e4
8 2.42 -1.13 1. Nb3 exd4 2. Nxd4 c5 3. bxc5 Nxc5
4. Bd2 Bc4 5. Re1 Qf6
8-> 3.10 -1.13 1. Nb3 exd4 2. Nxd4 c5 3. bxc5 Nxc5
4. Bd2 Bc4 5. Re1 Qf6
9 6.81 -0.96 1. Nb3 exd4 2. Nxd4 c5 3. bxc5 Nxc5
4. Bd2 Ne6 5. Nxe6 Qxe6 6. Rc1
9-> 7.60 -0.96 1. Nb3 exd4 2. Nxd4 c5 3. bxc5 Nxc5
4. Bd2 Ne6 5. Nxe6 Qxe6 6. Rc1
10 18.36 -1.19 1. Nb3 Qf6 2. Bd3 Qh4 3. Bxb5 Qxh3
4. f3 Nb8 5. dxe5 Qg3+ 6. Kh1 Bxe5
10-> 22.43 -1.19 1. Nb3 Qf6 2. Bd3 Qh4 3. Bxb5 Qxh3
4. f3 Nb8 5. dxe5 Qg3+ 6. Kh1 Bxe5
time=23.28 cpu=99% mat=0 n=8188457 fh=91% nps=351k
If you want me to run with different aspiration windows, let me know...
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