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Subject: MacChess 5.01 finds Rxd7+ under 8 minutes on 867 MHz Macintosh G4

Author: Richard A. Fowell

Date: 13:31:06 03/17/02

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<snip>
>Arasan apparently missed a win several times. One is at move 20:
>
[D] r3k1r1/pR1b1p2/2n1pQpp/3pP3/8/2P2N2/P1PKB1qP/5R2 w q -
>
>Here Rxd7! is better than h4. Crafty finds this in under a minute,
>Pharaon in about 2 1/2 minutes. Arasan 5.4 takes over 4 minutes
>(Athlon 1.4 GHz).
>
>Arasan 6.0 (latest build) can't find it in 10 minutes - maybe
>some bug, I'm not sure.
>
>--Jon

Here's MacChess's analysis from 1 second on - finds Rxd7!
during the 12th ply, in under 8 minutes on a 867 MHz Mac G4.

MacChess is freeware for the Macintosh -
download link, manual, other Mac chess software links at:
http://members.aol.com/macchess/

Ply    Time        Nodes     Eval   Principal Variation
=============================================================================
06/01|00:00:00|      240009|  -21| Nd4 Nd8 Nc6 Qg5+ Qxg5 hxg5 Nxd8 Rxd8 Rxa7
07/01|00:00:01|      447170|  -45| Nd4 Nd8 Nc6 Qg5+ Qxg5 hxg5 Nxd8 Rxd8 Rg1 f5
07/19|00:00:02|     1506802|  -29| Qh4 Na5 Rb4 g5 Qxh6 Nc4+ Ke1 Ne3
08/01|00:00:03|     2382988|  -29| Qh4 g5 Qxh6 Na5 Rbb1 Nc4+ Ke1 Rc8 Bxc4 Rxc4
08/02|00:00:05|     3661135|  +36| Nd4 Qg5+ Qxg5 hxg5 Nxc6 Bxc6 Rbxf7 a6 c4 d4
09/01|00:00:09|     6009102|  +36| Nd4 Qg5+ Qxg5 hxg5 Nxc6 Bxc6 Rbxf7 a6 c4 d4
10/01|00:00:17|    11557228|  +56| Nd4 Qg5+ Qxg5 hxg5 Nxc6 Bxc6 Rbxf7 Bd7 c4
dxc4
11/01|00:00:37|    25335895|  +52| Nd4 Qg5+ Qxg5 hxg5 Nxc6 Bxc6 Rbxf7 Bd7 c4
dxc4
12/01|00:01:47|    73166032|  +78| Nd4 Qg5+ Qxg5 hxg5 Nxc6 Bxc6 Rbxf7 Rh8 R7f6
12/35|00:07:41|   312111584| +153| Rxd7 Kxd7 Qxf7+ Ne7 Nd4 Qg5+ Kd1 Qxe5 Bb5+
Kd6
13/01|00:13:07|   529090375| +280| Rxd7 Kxd7 Qxf7+ Ne7 Nd4 Qg5+ Kd1 Rad8 Bb5+
Kc8
14/01|00:23:40|   957090636| +291| Rxd7 Kxd7 Qxf7+ Ne7 Nd4 Qg5+ Kd1 Rad8 Bb5+
Kc8
15/01|00:52:32|  2132462076| +287| Rxd7 Kxd7 Qxf7+ Ne7 Nd4 Qg5+ Kd1 Rad8 Bb5+
Kc8 Ba6+ Kd7 Qxe6+ Kc7 Nf3 Qe3 Qxe7+ Rd7 Qe6 Rf8 Bb5

Richard A. Fowell



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