Author: leonid
Date: 16:20:49 03/02/02
Go up one level in this thread
On March 02, 2002 at 18:31:18, Heiner Marxen wrote:
>On March 02, 2002 at 14:33:53, John Merlino wrote:
>
>>On March 02, 2002 at 08:21:10, leonid wrote:
>>
>>>[D]3Q3R/Q2b2Q1/1Q1q1Q2/1qQqQq1B/Nr1q1rNB/2qkq3/1qnbnq2/Q2K2QR w - -
>>>
>>>Please indicate your result.
>>>
>>>Thanks,
>>>Leonid.
>>
>>Chessmaster 8000 says Mate in 10 in 2 seconds:
>>
>>Time Depth Score Positions Moves
>>0:02 1/3 Mate10 164719 1.Nxf2+ Rxf2 2.Nxb2+ Qxb2 3.Bxe2+
>> Qxe2+ 4.Qxe2+ Rxe2 5.Qfxd4+ Nxd4
>> 6.Q7xd4+ Rxd4 7.Qcxd4+ Qdxd4 8.Qbxd4+
>> Qdxd4 9.Qaxd4+ Qxd4 10.Qgxd4#
>>0:06 1/4 Mate10 317014 1.Nxf2+ Rxf2 2.Nxb2+ Qxb2 3.Bxe2+
>> Qxe2+ 4.Qxe2+ Rxe2 5.Qfxd4+ Nxd4
>> 6.Q7xd4+ Rxd4 7.Qcxd4+ Qdxd4 8.Qbxd4+
>> Qdxd4 9.Qaxd4+ Qxd4 10.Qgxd4#
>>0:27 2/5 Mate10 1265606 1.Nxf2+ Rxf2 2.Nxb2+ Qxb2 3.Bxe2+
>> Qxe2+ 4.Qxe2+ Rxe2 5.Qfxd4+ Nxd4
>> 6.Q7xd4+ Rxd4 7.Qcxd4+ Qdxd4 8.Qbxd4+
>> Qdxd4 9.Qaxd4+ Qxd4 10.Qgxd4#
>>2:05 2/6 Mate10 5480662 1.Nxf2+ Rxf2 2.Nxb2+ Qxb2 3.Bxe2+
>> Qxe2+ 4.Qxe2+ Rxe2 5.Qfxd4+ Nxd4
>> 6.Q7xd4+ Rxd4 7.Qcxd4+ Qdxd4 8.Qbxd4+
>> Qdxd4 9.Qgxd4+ Qxd4 10.Q7xd4#
>>
>>jm
>
>Chest confirms this to be a shortest possible mate (congrats to CM!), and also
>the symmetric solution found by Sjeng (no surprise from the initial nearly
>symetric position) in 2.3 hours on K7/600 with 350 MB hash:
>
>PV: Nxf2+ Rxf2 Nxb2+ Qxb2 Bxe2+ Qxe2+ Qxe2+ Rxe2 Qgxd4+ Qdxd4 Qfxd4+ Qbxd4
>Qgxd4+ Qxd4 Qcxd4+ Rxd4 Qbxd4+ Nxd4 Q7xd4#
>PV: Nxb2+ Qxb2 Nxf2+ Rxf2 Bxe2+ Qxe2+ Qxe2+ Rxe2 Qgxd4+ Qdxd4 Qfxd4+ Qbxd4
>Qgxd4+ Qxd4 Qcxd4+ Rxd4 Qbxd4+ Nxd4 Q7xd4#
>
> Nxb2+ Qxb2 Nxf2+ Rxf2 Bxe2+ Qxe2+ Qxe2+ ...+6
> Rxe2 Qexd4+ ...+6
> Qxf2 Bxe2+ Qxe2+ Qxe2#
> Rxb2 Nxf2+ Rxf2 Bxe2+ Qxe2+ Qxe2+ ...+5
> Rxe2 Qexd4+ ...+5
> Qxf2 Bxe2+ Qxe2+ Qxe2#
> Nxf2+ Rxf2 Nxb2+ Qxb2 Bxe2+ Qxe2+ Qxe2+ ...+6
> Rxe2 Qexd4+ ...+6
> Rxb2 Bxe2+ Qxe2+ Qxe2+ ...+5
> Rxe2 Qexd4+ ...+5
> Qxf2 Bxe2+ Qxe2+ Qxe2#
>
>Chest's timing info shows an EBF around 6:
># 3 0.03s [ 3.00] 1kN [ 12.62] 0.95 93- 0
># 4 0.15s [ 5.00] 10kN [ 8.13] 1.12 308- 0
># 5 1.20s [ 8.00] 82kN [ 7.82] 1.29 2813- 0
># 6 7.29s [ 6.08] 483kN [ 5.91] 1.79 15452- 0
># 7 44.32s [ 6.08] 3024kN [ 6.26] 2.40 99438- 0
># 8 248.53s [ 5.61] 17283kN [ 5.72] 3.13 597059- 0
># 9 1155.17s [ 4.65] 83584kN [ 4.84] 4.42 2797265- 535
># 10 8042.53s [ 6.96] 526938kN [ 6.30] 6.01 25077142- 16329266
Thanks, Heiner!
Now I see that this is mate in 10. Probably, will put later mine to search mate
in 10 in the night. It could take hours, after my time for 9 moves. I see that
Chess Master found better by searching shorter mate in 10. Mine found by
selective only mate in 11 in 2 seconds. Will look if few additional versions for
selective will take this position in 10. This position was created last Summer
and then I had few selective versions for search.
My brute force, for my usual conditions:
Moves Time Branching factor NPS.
4 0.93 sec 112k
7.35
5 6.86 sec 110k
8.23
6 56.53 sec 98k
7.2
7 6 min 47 sec 106k
6.62
8 44 min 57 109k
6.03
9 4 hours 31 min 27 sec
Cheers,
Leonid.
>Cheers,
>Heiner
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