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Subject: Re: Testposition- king attack

Author: Steven J. Brann

Date: 19:15:16 10/21/01

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On October 21, 2001 at 17:57:10, Terry McCracken wrote:

>On October 21, 2001 at 17:53:03, Andrew Smith wrote:
>
>>I hope this diagram works...
>>
>>[D]r1bk3r/1pp2pp1/p2p1n1p/5q2/8/4BN2/PPPQ1PPP/3RR1K1 w - -
>>
>>How long does it take your program to find the strong move Bb6! ?

By comparison, Chessmaster 8000's time isn't that impressive at 3:42.  A PIII
933, custom personality with SS=12 and 256MB hash yields the following:

Time	Depth	Score	Positions	Moves
0:01	1/6	0.60	121716		1. Qc3 Qb5 2. Bf4 Bg4 3. Nd4 Qd7
0:09	1/7	0.67	496585		1. Qc3 Be6 2. Nd4 Qg6 3. Nxe6+
					fxe6 4. Qb3 Ke7 5. Bf4
0:20	1/7	0.75	997161		1. Qb4 Qb5 2. Rxd6+ Bd7 3. Rd4
					c5 4. Qxb5 axb5 5. Rd6 Re8 6. Bxh6
					Rxe1+ 7. Nxe1 gxh6 8. Rxf6 Rxa2
					9. Rxf7 Rxb2
0:24	1/8	0.58	1441971		1. Qb4 Qb5 2. Rxd6+ Bd7 3. Rd4
					Re8 4. Qc3 Nd5 5. Qa3 Nxe3 6. Rxe3
					Rxe3 7. fxe3
0:49	1/9	0.75	4213243		1. Qb4 Qb5 2. Rxd6+ Bd7 3. Rd4
					Qxb4 4. Rxb4 Kc8 5. Bd4 a5 6. Rb3
					Re8 7. Rxe8+ Nxe8
1:47	1/10	0.78	11284273	1. Qb4 Qb5 2. Rxd6+ Bd7 3. Rd4
					Re8 4. Qa3 c5 5. Rd6 Ne4 6. Rd5
					Qc6
3:42	1/10	1.46	26713588	1. Bb6 Nd5 2. Ba5 b6 3. c4 Bb7
					4. cxd5 bxa5 5. Qxa5 Rc8 6. Qc3
					Re8
4:23	1/11	1.46	32514565	1. Bb6 Nd5 2. Ba5 b6 3. c4 bxa5
					4. cxd5 Re8 5. Rxe8+ Kxe8 6. Qc3
					Bb7 7. Qxc7 Bxd5 8. Qxd6 Bxf3 9.
					gxf3 Qxf3
6:32	1/12	1.47	51492661	1. Bb6 Nd5 2. Ba5 b6 3. c4 bxa5
					4. cxd5 Re8 5. Rxe8+ Kxe8 6. Qc3
					Bb7 7. Qxc7 Bxd5 8. Re1+ Kf8 9.
					Qxd6+ Kg8

The default personality SS=6 with 64MB hash took 4:35 to see Bb6.

Steve



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