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Subject: Re: A different kind of test.

Author: John Merlino

Date: 21:17:33 08/08/02

Go up one level in this thread


On August 08, 2002 at 23:20:47, Slater Wold wrote:

>[D]3r1brk/1p3p1p/p1npp1p1/3Nn1Q1/P1P1PN2/1q4R1/5PPP/B1R3K1 b - - 0 24
>
>How long does it take your engine to understand it's losing?
>
>How long does it take it to understand it's losing badly?

It takes Chessmaster 9000, on a PIII-733, 4:14 to see that Qxa4 loses. The fail
low doesn't resolve until 7:39, in favor of Qa2, which doesn't look TOO bad at
first sight. On second sight, it looks a little worse:

Time	Depth	Score	Positions	Moves
0:00	1/3	-1.32	3722		24...Qxa4 25.Nb6 Qb4 26.Bd4
0:00	1/4	-1.67	13895		24...Qxa4 25.Nf6 Be7 26.Qh4 Rg7
0:00	1/5	-1.44	37160		24...Qxa4 25.Nf6 Be7 26.Qh4 Rg7
					27.Rh3
0:01	1/6	-1.36	109217		24...Qxa4 25.Nf6 Be7 26.Qh4 Rg7
					27.Rh3 Bxf6 28.Qxf6
0:04	1/7	-1.41	322890		24...Qxa4 25.Nf6 Be7 26.Qh4 Rg7
					27.Rh3 Bxf6 28.Qxf6 Re8 29.Bb2 Qa5
0:10	1/8	-1.38	859511		24...Qxa4 25.Nf6 Be7 26.Qh4 Rg7
					27.Rh3 Bxf6 28.Qxf6 Qa2 29.Nd3
					Qd2 30.Rb1
0:27	1/9	-1.29	2430899		24...Qxa4 25.Nf6 Be7 26.Qh4 Rg7
					27.Rh3 Bxf6 28.Qxf6 Re8 29.Rd3
					Qb4 30.Rcd1 Qxc4 31.Rxd6
1:13	1/10	-1.09	6848593		24...Qxa4 25.Nf6 Be7 26.Qh4 Rg7
					27.Rh3 Bxf6 28.Qxf6 Qa5 29.Rd1
					Kg8 30.Ne2 Re8 31.Bxe5 Nxe5
4:14	2/11	1.48	23163907	24...Qxa4 25.Nf6 Be7 26.N4h5 Rg7
					27.Qh6 Rdg8 28.f4 Ng4 29.Rxg4 Qa3
					30.Rd1 Qb3
7:39	2/11	0.60	42138807	24...Qa2 25.Nf6 Be7 26.N4h5 Rg7
					27.Qh6 Rdg8 28.Bc3 Bd8 29.Nxg7
					Bxf6 30.Nh5
15:32	3/12	1.04	88344527	24...Qa2 25.Nf6 Be7 26.N4h5 Rg7
					27.Qh6 Rdg8 28.Ne8 Bh4 29.Nhxg7
					Bxg3 30.hxg3 Qxa4 31.Nh5

jm



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