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Subject: Re: A couple of test positions

Author: John Merlino

Date: 10:27:46 11/12/04

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On November 12, 2004 at 08:03:52, Albert Silver wrote:

>The following shots were played by some Pro Deo settings I'm working on, against
>Fritz 8.0.0.26. Some engines should not have too much trouble, others may have
>more. They're nice shots in any case.
>
>[D]r1b2rk1/1p2bpp1/pqn1p2p/8/2B1QB1P/P3PN2/1P3PP1/1K1R3R w - - 0 16
>
>The game went quite spectacularly and PD played 16.Ng5! afer which the game
>proceeded with 16...g6 17.Nxf7! Kxf7 18.h5! Bxa3 19.Qxg6+ Ke7 20.Rd2 Bb4 21.Rd3
>Qc5 22.Bxh6 Rf5 23.Rhd1!! and black resigned a few moves later.
>
>[D]r1r3k1/pp2bpp1/2n1b2p/q2n4/3P2P1/P1NB1N1P/1PQB1P2/1K1R3R b - - 0 17
>
>Here PD played the strong 17...Ncb4! (not obvious to find for a human IMO) and
>play went 18.axb4 Bxb4 19.Bh7+ Kh8 20.Be4 Rxc3! 21.Bxc3 Nxc3+ 22.bxc3 Bxc3
>23.Qxc3 Qxc3 and white is lost.

CM9_R1 on an AMD 2500 needs less than one second to find the first one. For the
second one, it takes almost three minutes:

Time	Depth	Score	Positions	Moves
0:00	1/3	0.84	4333		17...Bd6 18.Nb5 Qd8 19.Nxd6 Qxd6
0:00	1/3	0.47	5773		17...a6 18.Be4 Nxc3+ 19.Bxc3 Qb5
0:00	1/3	0.39	7190		17...Nxc3+ 18.Bxc3 Qd5 19.Bh7+
					Kf8 20.Qd3
0:00	1/4	-0.11	13587		17...Nxc3+ 18.Bxc3 Qd5 19.Bh7+
					Kf8 20.Be4 Qa2+ 21.Kc1
0:00	1/5	-0.29	49049		17...Nxc3+ 18.Bxc3 Qd5 19.Bh7+
					Kf8 20.Be4 Qa2+ 21.Kc1 Na5
0:00	1/6	-0.22	98401		17...Nxc3+ 18.Bxc3 Qd5 19.Bh7+
					Kf8 20.Qd3 Qa2+ 21.Kc1 Na5 22.Nd2
0:01	1/7	-0.16	251861		17...Nxc3+ 18.Bxc3 Qd5 19.Be4 Qa2+
					20.Kc1 Bd6 21.Kd2 Na5 22.Ne5 Bxe5
					23.dxe5
0:03	1/8	-0.35	753451		17...Nxc3+ 18.Bxc3 Qd5 19.Bh7+
					Kf8 20.Be4 Qa2+ 21.Kc1 Na5 22.Rde1
					Bd6 23.Kd1 Bf4
0:11	1/9	-0.38	2500209		17...Nxc3+ 18.Bxc3 Qd5 19.Bh7+
					Kh8 20.Be4 Qa2+ 21.Kc1 Bb3 22.Qb1
					Qxb1+ 23.Bxb1 Bd5 24.Rd3 Nxd4 25.Rxd4
					Bxf3
0:27	1/10	-0.19	6254029		17...Nxc3+ 18.Bxc3 Qd5 19.Bh7+
					Kh8 20.Be4 Qa2+ 21.Kc1 Na5 22.Rde1
					Bd6 23.Bf5 Bxf5 24.Qxf5 Bxa3
1:50	1/11	-0.42	26550604	17...Nxc3+ 18.Bxc3 Qd5 19.Bh7+
					Kh8 20.Be4 Qa2+ 21.Kc1 Bd6 22.Kd2
					Bf4+ 23.Ke1 Bb3 24.Qb1 Re8 25.Ne5
					Qxb1 26.Rxb1 Nxe5 27.dxe5 Bxe5
					28.Bxe5 Rxe5
2:53	1/11	-2.37	43613895	17...Ncb4 18.axb4 Bxb4 19.Bh7+
					Kh8 20.Na4 Rxc2 21.Bxc2 Bxd2 22.Rxd2
					b6 23.b3 Rd8
3:22	1/12	-2.23	51354882	17...Ncb4 18.axb4 Bxb4 19.Bh7+
					Kh8 20.Na4 Rxc2 21.Bxc2 b6 22.b3
					Rc8 23.Bxb4 Nxb4
5:08	1/13	-2.35	80953844	17...Ncb4 18.axb4 Bxb4 19.Bh7+
					Kh8 20.Na2 Rxc2 21.Bxc2 Bxd2 22.Rxd2
					Kg8 23.Re1 Rd8 24.Rde2

jm



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