Author: Jeremiah Penery
Date: 17:42:28 06/17/02
Go up one level in this thread
On June 17, 2002 at 20:16:01, John Merlino wrote:
>Here's an amusing little Mate in 9 King chase that I had when testing
>Chessmaster 9000:
>
>[D]r6r/ppp1bQpp/2k1B1q1/4P3/4p3/2P1B3/PP3P1P/2K2R2 w - - 0 20
>
>Chessmaster announces Mate in 10 in three seconds on my PIII-600, then switches
>to Mate in 9 after ten seconds:
>
>Time Depth Score Positions Moves
>0:00 1/3 5.29 2701 20.Qxe7 b6 21.Qd7+ Kb7 22.Bd5+
> Kb8 23.Bxa8 Kxa8 24.Qxc7
>0:00 1/3 5.65 5976 20.Rd1 b6 21.Qxe7 Kb7 22.Bd5+ Kb8
> 23.Bxa8 Kxa8 24.Qxc7
>0:00 1/4 5.19 11659 20.Rd1 b6 21.Qxe7 Rhd8 22.Rxd8
> Rxd8 23.Qxd8 Qxe6 24.Qa8+ Kb5 25.Qxe4
> Qxa2 26.Qxh7
>0:01 2/5 14.85 74968 20.Rd1 b6 21.Bd5+ Kb5 22.Qxe7 Qd6
> 23.exd6 Raf8 24.Bxe4
>0:01 2/6 15.35 145320 20.Rd1 b6 21.Bd5+ Kb5 22.Qxe7 Qd6
> 23.exd6 c6 24.c4+ Ka6 25.Bxc6
>0:03 3/7 Mate10 374294 20.Rd1 b6 21.Bd5+ Kb5 22.Bc4+ Ka5
> 23.Qxe7 c5 24.Qd7 a6 25.b4+ cxb4
> 26.Rd5+ b5 27.Rxb5+ Ka4 28.Rxb4+
> Ka5 29.Qa4#
>0:10 3/8 Mate09 1098190 20.Rd1 b6 21.Bd5+ Kb5 22.Bc4+ Ka5
> 23.Qd5+ Bc5 24.Bxc5 Qg5+ 25.Kc2
> Qd2+ 26.Rxd2 bxc5 27.Qxc5+ Ka4
> 28.Qb4#
>
>Since four of the nine moves are not checking moves, can anybody else do better?
Here's an interesting result. Not as fast as CM (almost 50 times slower, given
the hardware difference) to find mate, but it finds a shorter one. This is
modified Crafty 18.15 with singular extensions, AthlonXP 1600MHz:
analyze.Black(1): r6r/ppp1bQpp/2k1B1q1/4P3/4p3/2P1B3/PP3P1P/2K2R2 w - - 0 20
clearing hash tables
time surplus 0.00 time limit 30.00 (3:30)
nss depth time score variation (1)
6 0.32 ++ 1. Rd1!!
6 0.77 9.57 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 c5 4.
c4+ Ka6 5. Qb7+ Ka5 6. Bd2+ Ka4 7.
Bxe4 <HT>
6-> 0.84 9.57 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 c5 4.
c4+ Ka6 5. Qb7+ Ka5 6. Bd2+ Ka4 7.
Bxe4 <HT>
7 1.54 ++ 1. Rd1!!
7 6.58 14.16 1. Rd1 b6 2. Bd5+ Kd7 3. Bb7+ Qd6 4.
Qf5+ Kd8 5. exd6 cxd6 6. Bxa8 Kc7 7.
Bd5 Kb8 8. Qxe4
7-> 6.78 14.16 1. Rd1 b6 2. Bd5+ Kd7 3. Bb7+ Qd6 4.
Qf5+ Kd8 5. exd6 cxd6 6. Bxa8 Kc7 7.
Bd5 Kb8 8. Qxe4
8 9.93 ++ 1. Rd1!!
8 16.26 17.17 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 Qd6 4.
exd6 c6 5. c4+ Ka6 6. Bxc6 Rad8 7.
Qb7+ Ka5 8. Qxa7+
8-> 16.82 17.17 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 Qd6 4.
exd6 c6 5. c4+ Ka6 6. Bxc6 Rad8 7.
Qb7+ Ka5 8. Qxa7+
9 26.31 ++ 1. Rd1!!
9 46.19 Mat09 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 a5 4.
Qxc7 Rac8 5. Bc4+ Ka4 6. Bb3+ Kb5 7.
Rd5+ Ka6 8. Bc4+ b5 9. Bxb5#
9-> 48.39 Mat09 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 a5 4.
Qxc7 Rac8 5. Bc4+ Ka4 6. Bb3+ Kb5 7.
Rd5+ Ka6 8. Bc4+ b5 9. Bxb5#
10 1:15 Mat08 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 a5 4.
Qxc7 Rac8 5. Bc4+ Ka4 6. Kb1 Rxc7 7.
b3+ Ka3 8. Bc1#
10-> 1:21 Mat08 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 a5 4.
Is the given line correct?
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