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Subject: Re: Is CM 9000 the same opinion?

Author: John Merlino

Date: 15:13:46 09/11/02

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On September 11, 2002 at 18:03:00, Thomas Lagershausen wrote:

>[D]5rk1/2n1qNb1/3pP1p1/Q2P3p/p1pr1p1P/3b4/BP1R1PPN/4R1K1 w - - 44.Rxd3 cxd3
>45.Qd2 Rb8 46.Nf3 Rdb4 47.Qxd3 Rxb2 48.Bc4 a3 49.Qxg6 Qf6 50.Qe4
>
>Tao 5.4 won a very complicated game against Hiarcs 8 in this position with
>44.Rxd3!?
>
>Would CM 9000 also play 44.Rxd3 !?
>

The answer appears to be "it depends on the hardware and the time control". :-)

This analysis was done on a humble PIII-600. CM9000 chooses Rxd3 after 39
seconds, but switches to Qb4 after 1:37. It might switch back to Rxd3 later,
however.... Ask me again when I get the computer that we're going to use against
GM Christiansen.

Time	Depth	Score	Positions	Moves
0:00	1/3	-2.72	2874		1.Qxa4 Ra8 2.Qc6 Rxa2 3.Nxd6 Rxd5
					4.Nxc4
0:00	1/3	-1.85	3304		1.Ng5 Ra8 2.Qb6 Nxd5
0:00	1/3	-1.09	3575		1.Rxd3 cxd3 2.Nf3
0:00	1/4	-0.82	6759		1.Rxd3 cxd3 2.Nf3 d2 3.Nxd2 Rb8
0:00	1/5	-0.75	23841		1.Rxd3 Rxd3 2.Bxc4 Rd4 3.b3 axb3
					4.Bxb3
0:01	1/6	-1.48	70531		1.Rxd3 cxd3 2.Nf3 d2 3.Nxd2 Ra8
					4.Qc3 Nxd5 5.Bxd5 Rxd5
0:01	1/6	-0.96	101770		1.Qb4 Rxd5 2.Rxd3 Rxd3 3.Bxc4 Nd5
					4.Qxd6
0:04	1/7	-0.96	233694		1.Qb4 Rxd5 2.Rxd3 Rxd3 3.Bxc4 Nd5
					4.Qxd6
0:13	1/8	-0.49	837690		1.Qb4 a3 2.Qxd6 Qxd6 3.Nxd6 axb2
					4.Rxb2 Rxd5 5.e7 Ra8 6.Rd2 Rxd6
					7.Bxc4+ Bxc4 8.Rxd6
0:34	1/9	-0.53	2186033		1.Qb4 Rxd5 2.Rxd3 Rxd3 3.Bxc4 Rd4
					4.Nf3 Nd5 5.Qxa4 Nb6
0:39	1/9	-0.45	2495407		1.Rxd3 Rxd3 2.Bxc4 Rd4 3.Qxa4 Rd2
					4.Nf3 Rxb2 5.N7g5 Bc3
0:56	1/10	-0.57	3735348		1.Rxd3 cxd3 2.Nf3 Rb8 3.Nxd4 Bxd4
					4.Rf1 Rxb2 5.Qxa4 Bf6 6.Qa3 Ne8
1:37	1/10	-0.31	6503042		1.Qb4 Rxd5 2.Rxd3 Rxd3 3.Bxc4 Rd4
					4.Nf3 Rxc4 5.Qxc4 d5 6.Qxa4 Nxe6
4:58	2/11	-0.35	20560463	1.Qb4 a3 2.Nf3 Rxd5 3.N7e5 axb2
					4.Rxd3 Bxe5 5.Rxd5 Nxd5 6.Qxc4
					Nb6 7.Qb5

jm



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