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Subject: what does "fail high" mean?

Author: scott farrell

Date: 19:34:40 11/29/02

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On November 29, 2002 at 21:12:55, Scott Gasch wrote:

>On November 29, 2002 at 17:22:20, Will Singleton wrote:
>
>>2rr3k/1p4p1/1P2b2p/p1Bnpp1q/8/Q1P2PP1/P6P/RB3RK1 b - - 0 26
>>
>>Solution times (amd 1.6ghz):
>>
>>Yace       not in 5 min
>>Crafty     not in 5 min
>>Aristarch  3:48 min
>>Gromit     3:12 min
>>Ruffian    44 sec
>>CM9000     5 sec
>>
>
>Monsoon fails high in 2:16 and resolves a PV in 4:27.
>
> 1u   +0.35  00:00:00.02  11           PV= a4 <+0.00>
> 1u   +1.35  00:00:00.05  57           PV= Nf4 <+0.00>
> 1.   +1.35  00:00:00.08  77           PV= Nf4 <+0.00>
> 2-   +0.57  00:00:00.13  190          **FL** --
> 2u   -0.47  00:00:00.14  302          PV= Ra8 1. Bd3 <+0.00>
> 2u   -0.36  00:00:00.15  380          PV= Rc6 1. Qxa5 <-1.00>
> 2u   -0.10  00:00:00.16  448          PV= Nf6 1. Qxa5 <-1.00>
> 2.   -0.10  00:00:00.21  508          PV= Nf6 1. Qxa5 <-1.00>
> 3.   +0.59  00:00:00.27  1635         PV= Nf6 1. Qxa5 e4 <-1.00>
> 4u   +0.64  00:00:00.31  6748         PV= Rc6 1. Bd3 Nxb6 2. Bxb6 Rxb6 [Q]
>                                        > 3. Qxa5 [Q] <+0.00>
> 4.   +0.64  00:00:00.38  9055         PV= Rc6 1. Bd3 Nxb6 2. Bxb6 Rxb6 [Q]
>                                        > 3. Qxa5 [Q] <+0.00>
> 5+   +1.40  00:00:00.47  22433        Nf6! ++
> 5.   +1.49  00:00:00.63  42341        PV= Nf6 1. Bd6 Bc4 2. Re1 Qxf3 3. Bxe5
>                                        > [Q] <+0.00>
> 6.   +1.52  00:00:00.93  90963        PV= Nf6 1. Bd6 e4 2. fxe4 fxe4 3. Bc2
>                                        > <+0.00>
> 7.   +1.77  00:00:01.49  209895       PV= Nf6 1. Bc2 Rd2 2. Rf2 Rxf2 3. Bxf2
>                                        > Qxf3 4. Qxa5 [Q] <+0.00>
> 8.   +1.77  00:00:03.82  698640       PV= Nf6 1. Bc2 Rd2 2. Rf2 Rxf2 3. Bxf2
>                                        > Qxf3 4. Qxa5 <+0.00>
> 9+   +2.52  00:00:05.36  994464       Nf6! ++
> 9.   +2.71  00:00:08.69  1812429      PV= Nf6 1. Bd6 Bc4 2. Rf2 e4 3. g4 Nxg4
>                                        > 4. fxg4 Qxg4+ [+] 5. Bg3 Rd1+
>                                        > [Q] 6. Kg2 [Q] <-1.00>
>10.   +3.02  00:00:26.78  5824368      PV= Nf6 1. Bd6 Bc4 2. Rf2 e4 3. Bc2
>                                        > e3 4. Rg2 Qxf3 5. Re1 <+1.00>
>11+   +3.77  00:02:16.62  28726569     Nf4! ++
>11.   +5.19  00:04:27.40  58248289     PV= Nf4 1. gxf4 Rd2 2. Bf2 [threat]
>                                        > Qxf3 3. Qxa5 Bd5 4. Qxd5 [threat]
>                                        > Qxd5 5. Bxf5 Rf8 6. c4 Qxc4 [Q]
>                                        > <+3.00>

How do you guys get this sort of output?

My engine doesnt report the final move Nf4 until it has fully analysed that
move, and hence already has the PV.

The rest of the ply takes more time, ie. discarding all other moves at the root.



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