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Subject: Re: Why this move is so difficult for engines ?

Author: John Merlino

Date: 12:27:13 10/17/02

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On October 17, 2002 at 04:51:28, Christophe Drieu wrote:

>[D] 8/4k3/4p3/pp5p/6p1/2P2rP1/PPK2R1P/8 w - - 0 1
>
>Rxf3 !

Chessmaster 9000, on a P4-2.66, has difficulty with this as well:

Time	Depth	Score	Positions	Moves
0:00	1/3	-0.28	675		1.Re2 Kd6 2.Rd2+ Ke5 3.Re2+ Kd5
0:00	1/4	-0.28	1973		1.Re2 Kd6 2.Rd2+ Ke5 3.Re2+ Kd5
0:00	1/5	-0.32	4381		1.Re2 Kd6 2.Rd2+ Ke5 3.a4 bxa4
					4.Rd4
0:00	1/6	-0.27	11492		1.Re2 Kd6 2.b3 e5 3.Kd2 Ke6 4.a4
0:00	1/6	-0.22	24333		1.Rd2 Re3 2.b3 Re5 3.c4 bxc4 4.bxc4
0:00	2/7	-0.19	52924		1.Rd2 Rf5 2.b3 Rc5 3.a4 bxa4 4.bxa4
					Rc4 5.Rd4
0:00	3/8	-0.24	101654		1.Rd2 a4 2.b3 Re3 3.bxa4 bxa4 4.c4
					Re5 5.Rd1 Re2+ 6.Rd2
0:00	4/9	-0.24	209602		1.Rd2 Re3 2.b3 Re4 3.Kd3 Re5 4.b4
					Rd5+ 5.Ke3 a4 6.Rd4
0:01	4/9	-0.17	318616		1.Re2 a4 2.b3 a3 3.c4 bxc4 4.bxc4
					Kd6 5.Kd2 Rf5 6.Kd3
0:02	5/10	-0.22	580408		1.Re2 a4 2.b3 a3 3.c4 bxc4 4.bxc4
					Kd6 5.Re1 Kc5 6.Rxe6 Kxc4
0:05	6/11	-0.15	1665581		1.Re2 a4 2.b3 a3 3.Rd2 Rf8 4.c4
					Rc8 5.Re2 bxc4 6.bxc4 Kd6 7.Kd3
0:12	7/12	-0.17	3719978		1.Re2 a4 2.b3 a3 3.Rd2 Rf8 4.c4
					Rc8 5.Re2 bxc4 6.bxc4 Rxc4+ 7.Kb3
					Rc5 8.Kxa3 Kd6
0:49	8/13	-0.11	14928942	1.Re2 a4 2.b3 a3 3.Rd2 Re3 4.c4
					bxc4 5.bxc4 Kf6 6.Rd1 Ke5 7.c5
					Re2+ 8.Kb3
1:37	9/14	-0.12	29722288	1.Re2 a4 2.b3 a3 3.Rd2 Rf8 4.c4
					Rc8 5.Kc3 bxc4 6.bxc4 e5 7.Rd5
					Ke6 8.Kd3 e4+ 9.Kd4
3:50	10/15	-0.19	71282111	1.Re2 a4 2.b3 Kd6 3.Rd2+ Kc6 4.bxa4
					bxa4 5.Re2 Kd5 6.Rd2+ Kc4 7.Rd4+
					Kb5 8.Rb4+ Ka5 9.Kb2 Re3 10.Rc4
					Re2+ 11.Ka3 Kb5
6:00	10/15	-0.15	111554657	1.Rd2 a4 2.b3 e5 3.bxa4 bxa4 4.c4
					e4 5.Re2 Kd7 6.Kb2 h4 7.gxh4 Rh3
					8.Kb1 e3
10:46	11/16	-0.15	200080581	1.Rd2 a4 2.b3 Re3 3.bxa4 bxa4 4.Kb2
					Re4 5.Kc2 e5 6.Kd3 Re1 7.Rf2 Ke6
					8.c4 Rd1+ 9.Kc2 Rd4 10.c5

jm



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