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Subject: Re: Two test positions

Author: John Merlino

Date: 10:46:17 07/08/02

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On July 07, 2002 at 19:02:36, Mike Byrne wrote:

>from a Crafty(W) (modified) vs Tiger (B)
>
>[D]8/1p4rk/1p1R1Qb1/2p4p/P3p1p1/1P2q1P1/6KP/3B4 b - - 0 1; bm !Qc1

Chessmaster 9000 does a LOT of waffling on this one, but finally appears to
avoid Qc1 after 1:04 on a PIII-600:

Time	Depth	Score	Positions	Moves
0:00	1/4	-1.54	8221		1...b5 2.axb5 Qe1 3.Bc2 Qe2+ 4.Qf2
0:00	1/4	-1.60	11695		1...Qc1 2.Rd8 e3 3.Bxg4 Qc2+ 4.Kg1
					Qxb3
0:00	1/5	-1.30	21186		1...Qc1 2.Rd8 Qb1 3.Kg1 e3 4.Qxb6
0:01	1/6	-1.27	71763		1...Qc1 2.Rd8 e3 3.Qe5 b5 4.axb5 b6
0:01	1/6	-1.34	100146		1...Qh6 2.Rd8 Qc1 3.Bxg4 Qc2+ 4.Kg1
					Qxb3 5.Bf5
0:03	1/7	-1.09	198915		1...Qh6 2.Qc3 Qg5 3.Be2 Re7 4.Rxb6
					e3 5.Bd3
0:03	1/7	-1.21	234442		1...Qc1 2.Rd8 e3 3.Qe5 b5 4.axb5
					b6 5.Kg1
0:07	1/8	-0.80	558991		1...Qc1 2.Bxg4 Qc2+ 3.Kh1 Qxb3
					4.Bxh5 Bxh5 5.Qh6+ Kg8 6.Rd8+ Be8
					7.Rxe8+ Kf7 8.Rd8 Qf3+ 9.Kg1 e3
0:09	1/8	-1.07	685885		1...Qh6 2.Rd8 Qc1 3.Kg1 Qe3+ 4.Kg2
					b5 5.axb5 Kh6 6.Kh1
0:14	1/9	0.00	1059307		1...Qh6 2.Rd8 Qc1 3.Kg1 Qe3+ 4.Kg2
					b5 5.Qf8 Kh6 6.Qh8+ Rh7 7.Qf8+ Rg7
0:18	1/9	-0.67	1424669		1...Qc1 2.Bxg4 Qc2+ 3.Kh1 Qb1+
					4.Kg2 Qxb3 5.Bxh5 Qc2+ 6.Kh3 Bxh5
					7.Qh6+ Kg8 8.Rd8+ Kf7 9.Qxh5+ Rg6
0:44	2/10	-0.22	3501469		1...Qc1 2.Bxg4 Qe3 3.Be6 Kh6 4.Qf2
					Qxf2+ 5.Kxf2 b5 6.axb5 Re7 7.Bf5
1:04	2/10	-0.47	5131275		1...c4 2.bxc4 Qc5 3.Be2 Qa5 4.Rd8
					e3 5.Qf8 Be4+ 6.Kg1 Qe1+ 7.Bf1
					Qa1 8.Qe8
1:37	3/11	-0.37	7953720		1...c4 2.bxc4 Qc5 3.Be2 Qa5 4.Qa1
					Qb4 5.Rd5 e3 6.Qe5 Re7
3:37	4/12	-0.25	18113176	1...c4 2.bxc4 Qc5 3.Be2 Qa5 4.Bd1
					Qf5 5.Qxf5 Bxf5 6.Bc2 Rg6 7.Rd4
					Re6 8.Rd7+ Kh6 9.Rxb7

>and the position after Qc1...
>
>[D]8/1p4rk/1p1R1Qb1/2p4p/P3p1p1/1P4P1/6KP/2qB4 w - - 0 1; bm Bxg4!

Chessmaster 9000 needs five seconds to find Bxg4:

Time	Depth	Score	Positions	Moves
0:00	1/3	-2.33	2428		2.Be2 Qc2 3.Kf2 Qxb3 4.Rxb6 Qxa4
0:00	1/3	-1.60	3358		2.Rd8 e3 3.Bxg4 Qc2+ 4.Kg1 Qxb3
0:00	1/4	-1.30	10526		2.Rd8 Qb1 3.Kg1 e3 4.Qxb6
0:00	1/5	-1.27	30374		2.Rd8 e3 3.Qe5 b5 4.axb5 b6
0:01	1/6	-1.21	73234		2.Rd8 e3 3.Qe5 b5 4.axb5 b6 5.Kg1
0:02	1/7	-1.21	190585		2.Rd8 e3 3.Qe5 b5 4.axb5 b6 5.Kg1
0:05	1/7	-0.80	415502		2.Bxg4 Qc2+ 3.Kh1 Qxb3 4.Bxh5 Bxh5
					5.Qh6+ Kg8 6.Rd8+ Be8 7.Rxe8+ Kf7
					8.Rd8 Qf3+ 9.Kg1 e3
0:08	1/8	-0.67	639415		2.Bxg4 Qc2+ 3.Kh1 Qb1+ 4.Kg2 Qxb3
					5.Bxh5 Qc2+ 6.Kh3 Bxh5 7.Qh6+ Kg8
					8.Rd8+ Kf7 9.Qxh5+ Rg6
0:21	1/9	-0.18	1649780		2.Bxg4 hxg4 3.Rd8 Be8 4.Rxe8 Qd2+
					5.Qf2 Qd5 6.Qe3 Rd7 7.Qxe4+ Qxe4+
					8.Rxe4 Rd2+ 9.Kf1
0:46	2/10	0.00	3700475		2.Bxg4 hxg4 3.Rd8 Kh6 4.Qh4+ Bh5
					5.Qf6+ Kh7 6.Qf5+ Bg6 7.Qf6
1:32	3/11	0.00	7757103		2.Bxg4 hxg4 3.Rd8 Kh6 4.Qh4+ Bh5
					5.Qf6+ Kh7 6.Qf5+ Bg6 7.Qf6

jm



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