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Subject: Re: Test Position Karpov-Sax 1983

Author: John Merlino

Date: 09:47:21 09/15/05

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On September 15, 2005 at 07:34:38, ludicrous wrote:

>[D]r3kr2/pp2bpp1/2b4p/q3p3/2B1p1PP/1Q2B3/PPP2P2/2KR2R1 w q - 0 18
>
>Karpov played Rd5.
>
>Was this sac necessary?  Will any engine play this move?

CM9_R1 on a P4-2.4 says:

Time	Depth	Score	Positions	Moves
0:00	1/3	-0.50	1978		18.Bd2 Qb6 19.Qxb6 axb6
0:00	1/3	-0.12	2681		18.Bd5 Rd8 19.Bxc6+ bxc6 20.Qc4
0:00	1/4	-0.12	6510		18.Bd5 Rd8 19.Bxc6+ bxc6 20.Qc4
0:00	1/5	-0.03	29013		18.Bd5 Qb4 19.Qxb4 Bxb4 20.Bxc6+
					bxc6 21.c3 Be7
0:00	1/5	0.13	42691		18.g5 Rc8 19.gxh6 Ba4 20.hxg7 Bxb3
					21.gxf8=Q+ Bxf8 22.Bxb3
0:00	1/6	0.11	84345		18.g5 Rc8 19.Bd5 Rd8 20.Bxc6+ bxc6
					21.Rxd8+ Qxd8 22.Bxa7 hxg5 23.hxg5
0:01	1/7	0.13	274282		18.g5 Rc8 19.Bd5 Ba4 20.Qxb7 Rxc2+
					21.Kb1 Qc7 22.Bxa7 Qxb7 23.Bxb7
0:04	1/8	0.53	859017		18.g5 h5 19.g6 fxg6 20.Rxg6 Rd8
					21.c3 Bf6 22.Kb1 Rxd1+ 23.Qxd1 Qa4
0:10	1/9	0.38	1996036		18.g5 hxg5 19.Bxg5 Rd8 20.Rxd8+
					Bxd8 21.Bxd8 Kxd8 22.Bxf7 Kc7 23.Qe6
					Rd8
0:20	1/10	0.36	4166675		18.g5 hxg5 19.Bxg5 Bxg5+ 20.Rxg5
					Rd8 21.Rxg7 Rxd1+ 22.Kxd1 Qd8+
					23.Ke1 Qf6 24.Qg3 Qd6 25.Qc3 Ke7
0:50	1/11	0.42	10838041	18.g5 hxg5 19.Bxg5 Qb4 20.Bxe7
					Qxb3 21.Bxb3 Kxe7 22.Rxg7 Kf6 23.Rdg1
					Rad8
2:01	1/12	0.50	26384957	18.g5 hxg5 19.Bxg5 Qb4 20.Bxe7
					Qxb3 21.Bxb3 Kxe7 22.Rxg7 Kf6 23.Rdg1
					Rad8 24.h5

jm



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