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Subject: Re: Bad PV's

Author: Dann Corbit

Date: 17:01:24 07/16/04

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On July 16, 2004 at 19:49:37, Stuart Cracraft wrote:

>Hi -- I have spent days on the hashing and
>am ready for something else for awhile.
>Found 4 or 5 hashing bugs so far. A real
>hornet's nest that one...
>
>18 ASSERT's in overall code are showing that measurables
>being measured are all okay and not violating the
>ASSERT's. Thank you Bob Floyd, R.I.P., 1st programming class.
>
>On the other hand, my PV per iteration has gone
>to hell in a handbag. Anyone have a "usual suspect"
>for the dogmove 2. ... d7d5 below at 4th iteration?
>My max positional (mp) sums to typicaly < 1/5 of a pawn
>so it's not that.
>
>When the ASSERT's were violating before the
>hash work, the PV's were always relatively clean.
>
>1. e2e4  0.00   31       21 e2e4
>2. e2e4  0.00    0       87 e2e4 e7e5
>3. e2e4  0.01   17      276 e2e4 e7e5 f1c4
>4. e2e4  0.04    0     1714 e2e4 e7e5 f1c4 d7d5
>5. e2e4  0.12   17     7636 e2e4 e7e5 g1f3 d7d5 e4d5
>6. e2e4  0.43    0    31106 e2e4 e7e5 f1c4 d7d5 e4d5 d8d5
>7. e2e4  1.57   17   121299 e2e4 e7e5 f1c4 d7d5 e4d5 d8d5 c4d5
>8. e2e4  5.64    0   433830 e2e4 e7e5 f1c4 d7d5 e4d5 d8d5 c4d5 b8c6
>e2e4  5.64    0   433830 e2e4 e7e5 f1c4 d7d5 e4d5 d8d5 c4d5 b8c6
>nps=76892 ha=29.00% q=81.0% bc=72% br=3.6% mp=178<>178
>pawnx=0 recapx=0 qcheckx=25250 checkx=0 futilx=0 qfutilx=40132

The pawn move is bad, but it is a lot less suspect than tossing the queen!
Perhaps your evaluation is inverted for black?  He looks like he's in a hurry to
lose.



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