Author: Uri Blass
Date: 08:52:33 11/25/02
Go up one level in this thread
On November 25, 2002 at 11:16:13, Will Singleton wrote: >On November 25, 2002 at 10:14:27, Terry McCracken wrote: > >>On November 25, 2002 at 00:29:56, John Merlino wrote: >> >>>On November 24, 2002 at 23:56:30, Terry McCracken wrote: >>> >>>>[D]8/4p3/4Q3/8/8/k1p3PP/1q3P1K/8 w - - 0 1 >>>> >>>>This is reposted as it was given little attention. >>>> >>>> >>>>http://www.talkchess.com/forums/1/message.html?266990 >>> >>>Chessmaster 9000, on a P3-733, gives up on Qxe7+ in two seconds: >>> >>>Time Depth Score Positions Moves >>>0:00 1/3 0.20 5091 1.Qxe7+ Ka2 2.Qe6+ Kb1 3.Qf6 >>>0:00 1/4 0.20 10263 1.Qxe7+ Ka2 2.Qe6+ Kb1 3.Qe1+ Qc1 >>> 4.Qe5 >>>0:00 1/5 0.18 25204 1.Qxe7+ Ka2 2.Qe6+ Kb1 3.Qe1+ Ka2 >>> 4.h4 c2 5.Qe6+ Kb1 >>>0:00 1/6 0.00 64218 1.Qxe7+ Ka2 2.Qe6+ Kb1 3.Qe1+ Ka2 >>> 4.Qe6+ >>>0:02 1/7 -0.18 154813 1.Qxe7+ Ka2 2.Qe6+ Qb3 3.Qa6+ Kb1 >>> 4.h4 c2 5.Qg6 Qc3 6.f4 >>>0:02 1/7 0.00 206769 1.Qa6+ Kb4 2.Qb7+ Kc4 3.Qe4+ Kb3 >>> 4.Qe6+ Ka4 5.Qc6+ Kb3 6.Qe6+ >>>0:03 2/8 0.00 296235 1.Qa6+ Kb4 2.Qb7+ Kc4 3.Qe4+ Kb3 >>> 4.Qe6+ Ka4 5.Qc6+ Kb3 6.Qe6+ >>>0:07 3/9 0.00 624641 1.Qa6+ Kb4 2.Qb7+ Kc4 3.Qe4+ Kb3 >>> 4.Qe6+ Ka4 5.Qc6+ Kb3 6.Qe6+ >>> >>>jm >> >>Yes, the only way to draw is Qa6+!! CM 9000 is Stong! >> >> >>1. Qxe7+ Ka2 2. Qe6+ Kb1 3. Qe4+ c2 is dead lost for White! >> >>1. Qxe7+ Ka2 2. Qe6+ >>( 2. Qa7+) >>2... Kb1 3. Qe4+ >>( 3. Qe1+ Qc1 ) >>3... c2 4. Qe1+ >> >>Terry > >I don't see it. If 1. Qxe7+ Ka2 2. Qe6+ Kb1 3. Qe1+, it looks like a draw. > >Will I do not see a forced win but I can understand some ideas for black to try to win it. Here is a possible tree that demonstrates some lines(against your line I show how black can slowly plan to push the pawn to c2 and in other lines I show how black can get winning chances when the pawn is in c2) I do not say that the line is forced and white may have better defence. 1.Qe6xe7+ [1.Qe6-a6+] 1...Ka3-a2 2.Qe7-e6+ Ka2-b1 3.Qe6-e4+ [3.Qe6-e1+ Kb1-a2 4.Qe1-e6+ Qb2-b3 5.Qe6-a6+ Ka2-b2 6.Qa6-f6 Kb2-b1 7.Qf6-f3 Kb1-a2 8.Qf3-a8+ Ka2-b2 9.Qa8-h8 Kb2-b1 10.Qh8-h7+ c3-c2 11.Qh7-e4] 3...c3-c2 4.f2-f4 [4.Qe4-f5 Qb2-c3 5.Qf5-b5+ Kb1-a2 6.Qb5-e2 Ka2-b3 7.Qe2-b5+ Kb3-a3 8.Qb5-a6+ Ka3-b4 9.Qa6-b7+ Kb4-c5 10.Qb7-c7+ Kc5-d4 11.Qc7-f4+ Kd4-d3 12.Qf4-e3+ Kd3-c4 13.Qe3-c1 Kc4-b3] 4...Qb2-c3 5.h3-h4 Kb1-b2 6.Qe4-b7+ Kb2-a3 7.Qb7-a6+ Ka3-b4 8.Qa6-b7+ Kb4-c5 9.Qb7-c7+ Kc5-d4 10.Qc7-e5+ Kd4-d3 Line Uri
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