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****Chess Tactics Problems Here**** ****Chess Tactics Problems Here****

04-06-2009 , 11:10 AM
bigpooch,
looks about right. I guess in the variation 1.Rxe2 Qxe2 2.Qd8+ Kg7 3.Qf6+ is a simpler mate. 1.Rxe2 Ra6 looks like another attempt at defense for black.
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04-06-2009 , 03:52 PM
Quote:
Originally Posted by smilingbill
bigpooch,
looks about right. I guess in the variation 1.Rxe2 Qxe2 2.Qd8+ Kg7 3.Qf6+ is a simpler mate. 1.Rxe2 Ra6 looks like another attempt at defense for black.
Yes, that mate is very much simpler.

1. Rxe2 Ra6 2. Qb2 with the threat of Rd2 looks strong. After 2...Qxa4
3. Rd2, 3...Bd7 fails to 4. Qxb7.

I wonder what the "bot" evaluation of these two lines are:

a) 1. Rxe2 Ra6 2. Qb2 (seems like Black's best defence followed by White's
best response); and

b) 1. Rd2 Qg1+ 2. Qxg1 Nxg1 3. Rd8+ Kg7 4. Kxg1.

I'm curious to know which of a) or b) is "best" or what Rybka's "main line" is.
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04-06-2009 , 05:10 PM
Quote:
Originally Posted by bigpooch
I wonder what the "bot" evaluation of these two lines are:

a) 1. Rxe2 Ra6 2. Qb2 (seems like Black's best defence followed by White's
best response); and

b) 1. Rd2 Qg1+ 2. Qxg1 Nxg1 3. Rd8+ Kg7 4. Kxg1.

I'm curious to know which of a) or b) is "best" or what Rybka's "main line" is.
Fritz at depth 21 (about 15 minutes of eval) says:

1. Rxe2 Ra6 2. Qe3 Qd6+ 3. e5 Qc7 4. Kh1 +1.24
1. Rd2 Qg1+ 2. Qxg1 Nxg1 3. Rd8+ Kg7 4. Kxg1 +0.67

Last edited by BobJoeJim; 04-06-2009 at 05:18 PM. Reason: Search got deeper
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04-06-2009 , 05:21 PM
Quote:
Originally Posted by BobJoeJim
Fritz at depth 21 (about 15 minutes of eval) says:

1. Rxe2 Ra6 2. Qe3 Qd6+ 3. e5 Qc7 4. Kh1 +1.24
1. Rd2 Qg1+ 2. Qxg1 Nxg1 3. Rd8+ Kg7 4. Kxg1 +0.67
Thank you very much ( and thanks for 15 minutes of evaluation )!
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04-06-2009 , 05:25 PM
Quote:
Originally Posted by bigpooch
Thank you very much ( and thanks for 15 minutes of evaluation )!
No problem, I'm in class right now so it's not like I've got anything better to use my processing power on

Edit: At depth 22 the Rxe2 line is still +1.24 but now likes 3. Bf4 Qb4 4. Rd2. (Generally though, I've noticed that if you move even one or two steps into a line the next moves will often be different. I'm going to play through Qd6+ and see how it continues this line from there...)
The Rd2 line improved to +0.69, hehe.

Edit 2: After Rxe2 Ra6 (forced, but it took about a minute to realize it), white's second move is a very close decision between Qb5 and Qe3, it's bouncing back and forth between which one Fritz prefers at each extra ply of depth. Right now at depth 20 it marginally prefers Qb5 (+1.30 to +1.21). I'll investigate that continuation now.

Last edited by BobJoeJim; 04-06-2009 at 05:34 PM.
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04-27-2009 , 10:00 PM
Hey guys,



This is a theoretical position from a game I played. (In the game, white's queen was on c8 instead; something that I missed in my analysis)

White has just captured Black's knight on e3, sacrificing the exchange for a pawn in order to blunt Black's kingside attack. What should black do now?
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04-27-2009 , 10:45 PM
Spoiler:
1. Rg6 2. R3e2. 2. Rxh3
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04-27-2009 , 11:15 PM
Spoiler:
That allows a perpetual by Qe5+
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04-28-2009 , 12:13 AM
Should I be putting this in a new thread?
Sorry if that's what I should have done.

Could a mod move post #81 onwards to a new thread, if possible? I have one other position from my game that I'd like to post in the same thread, too.
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04-28-2009 , 12:21 AM
Spoiler:

1...Rxh3+ 2. Kg1 (2. gxh3 Qxh3+ 3. Kg1 Rg6+ 4. Kf2 Qh2#) fxe3 (threatening 3...Qf2#) 3. Rxe3 (3. Re2 Qh2+ 4. Kf1 Qh1#) Rh1+ 4. Kxh1 Rh6+ 5. Kg1 Qxb8
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04-28-2009 , 12:34 AM
Spoiler:
Oh! That works too. Good job
I saw another line in the 2. Kg1 version that leads to a faster mate, but your one looks like it's all good

The line is 1...Rxh3+ 2. Kg1 Rh2 3. R3e2 Qh4
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04-29-2009 , 03:14 PM
Here's a neat one I did today. Black to move.

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04-29-2009 , 04:49 PM
How about...

Spoiler:
1. Rxh2 Kg1 (else 2. Rh1#) 2. Rg2+ Kh1 (else h2; h1=Q#) 3. Rxf2+ Kg1 4. Rg2+ Kf1 (else Rxa2+, then RxQ) 5. h2 Qxf8+ 6. Kh7 (if KxQ, Re8#!) Qxg7 7. Rxg7 Bxg7 8. h1=Q#


EDIT: This is no good because of
Spoiler:
1... Qxf8+, etc.

What about 1. Qb6 Bf4 2. Qxb5 cxb5 then 3. Rxh2, continuing as above?

Last edited by bobman0330; 04-29-2009 at 05:09 PM.
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04-29-2009 , 06:09 PM
Spoiler:
1...Qxc4+! costs White his queen and rook


very beautiful, I've never seen something quite like this in practice.
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04-29-2009 , 11:20 PM
Spoiler:
1... Qxc4+ 2. Bxc4 Rxh2 3. Qxf8+ Kxf8 4. Re8+ Kxe8 5. Ke1
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