Author: Heiner Marxen
Date: 15:31:18 03/02/02
Go up one level in this thread
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
Cheers,
Heiner
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