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Subject: Re: Test position (Averbach-Friedstein, 1946)

Author: John Merlino

Date: 17:59:37 10/08/04

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On October 08, 2004 at 18:47:37, Alessandro Scotti wrote:

>I've found the following position in a book by Averbach and Bejlin, it is from a
>1946 game between Averbach and Friedstein:
>
>[D]3r1r1k/2q1bppp/p1bppn2/1p3PB1/3QP3/2N3R1/PPP1B1PP/5R1K w - - 0 3
>
>Here Averbach played Rh3! (his own annotation) and went on to win with a nice
>mate combination. The following of the game was: 1... Qb7 2. Rf4! Nxe4 3. Bxe7
>Nxc3 4. Qxg7+! Kxg7 5. Rg4+ Rh8 6. Bf6#
>
>Kiwi likes 1. fxe6 with an even score... what does your favorite engine finds?

CM9_SKR on an AMD 2500 finds Rh3 in 0:34, but does not see the Rf4 follow up. It
would probably spot it at the next depth after the last one below, which would
come after about 6-7 minutes.

Time	Depth	Score	Positions	Moves
0:00	1/3	0.29	4100		3.a4 e5 4.Qd3
0:00	1/3	0.32	6461		3.fxe6 fxe6 4.Kg1 Rc8
0:00	1/4	0.11	25209		3.fxe6 fxe6 4.Rh3 Ng4 5.Rxf8+ Rxf8
					6.Bxe7 Qxe7 7.Nxb5
0:00	1/4	0.41	26944		3.a4 e5 4.Qd3 bxa4
0:00	1/5	0.13	65545		3.a4 e5 4.Qd3 b4 5.Nd5 Nxd5 6.exd5
					Bxa4 7.Bxe7 Qxe7 8.Qxa6
0:00	1/6	0.27	162430		3.a4 e5 4.Qd3 b4 5.Bxf6 Bxf6 6.Nd5
					Bxd5 7.Qxd5 Qxc2 8.Bxa6 Qxa4
0:02	1/7	0.15	387254		3.a4 e5 4.Qd3 bxa4 5.Rd1 Bb7 6.Ra1
0:10	1/8	0.05	2075590		3.a4 bxa4 4.fxe6 fxe6 5.Bxa6 Rb8
					6.Bc4 e5 7.Bxf6 Rxf6
0:29	1/8	0.10	5905512		3.a3 Qb7 4.Bf3 Rc8 5.Qd3 b4 6.axb4
					Qxb4 7.fxe6 fxe6
0:34	1/8	0.13	7026448		3.Rh3 Rb8 4.a3 e5 5.Qf2 Kg8 6.Qh4
					h6
0:48	1/9	0.08	9946766		3.Rh3 Qb7 4.Qf2 Kg8 5.Qh4 h6 6.Bxh6
					Bxe4 7.Rg3
2:20	1/10	0.14	30450502	3.Rh3 Qb7 4.Qf2 Bxe4 5.Nxe4 Qxe4
					6.Bd3 Qg4 7.Bxf6 Bxf6 8.fxe6 fxe6
					9.Rxh7+ Kg8

Of course, 3...Nxc3 fails miserably, and 3...Ng5 would allow Black to continue.

jm



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