Author: Dann Corbit
Date: 13:58:49 02/28/02
Go up one level in this thread
On February 28, 2002 at 16:52:43, Uri Blass wrote:
>On February 28, 2002 at 16:36:41, Dann Corbit wrote:
>
>>On February 28, 2002 at 15:00:03, Les Fernandez wrote:
>>
>>>[D]8/4b1k1/R5pp/2p1pp2/1pQq4/1P1P3P/1P3PPK/8 w - -
>>>
>>>
>>>I am interested to know if the above position can be held by black. White is
>>>short on time but can force perpetual by Qe6. Although a rook is better then a
>>>bishop, most of the time, should white exchange queens here? I am only an
>>>average player but after doing a little analysis on this position Crafty reports
>>>the following on a fairly slow machine. (Pentium 350, 256 mb ram)
>>>
>>>8/4b1k1/R5pp/2p1pp2/1pQq4/1P1P3P/1P3PPK/8 w - - acd 15; acn 170618898; acs 900;
>>>ce 155; pv Kg1 Qxc4 bxc4 h5 g3 Kf7 Kg2 Bf6 Rc6 Be7 Kf3 g5;
>>>
>>>Although white is reported to have a 1.55 advantage after Kg1 I wonder if the
>>>position can be held by black. I also took a look at the position with white
>>>taking the queen and the ce still appeared about the same with black capturing
>>>white queen with cxd4.
>>>
>>>8/4b1k1/R5pp/2p1pp2/1p1Q4/1P1P3P/1P3PPK/8 b - - acd 17; acn 186582676; acs 902;
>>>ce -151; pv cxd4 Kg3 Kf7 Kf3 h5 Rc6 Bf6 Rb6 Be7 g3 Bf8 h4 Be7;
>>>
>>>Question is with queens off the board can the white rook start chopping up the
>>>black pawns while the black bishop exists? Can someone run this on better
>>>hardware and tkae it a bit deeper to see what falls out?
>>
>>Beowulf does not swap queens as black (which I think is a mistake). Now, when
>>you are behind, the last thing you want to do is trade equal pieces and
>>especially queens.
>
>I agree that when you are behind you do not want to trade queens.
>
> But in this case, I think it saves a draw. Darting away
>>will probably end in a loss.
>
>
>why do you think that trading queens can save the draw?
>
>I know from experience that the stronger side usually win with advantage of a
>rook against bishop and it is espacially true in the endgame
>
>It is possible to compose a close position when the rook can do nothing but the
>position in the board is not a close position so I have no reason to assume that
>the rook cannot win against the bishop.
After thinking about g4 (which can be played whenever white likes to do it), I
am sure you are right. Black is just plain lost here.
Here is Phalax's plan for white, to delay the exchange one move and get a better
position for the rook:
5 -> 0:00.60 74260 1 turn
6 197 90 112415 Qc4xd4 Pc5xd4 Pg2-g3 Kg7-f7 Pf2-f3
6 202 96 119525 Ra6-a7 !
6 202 101 125676 Ra6-a7 Kg7-f6
6 207 119 151952 Kh2-g1 !
6 208 144 188362 Kh2-g1 Qd4-f4 Ra6-e6 Be7-f8
6 -> 0:01.75 228524 2 turns
7 205 237 317504 Kh2-g1 Qd4-d7 Ra6-a8 Be7-f8 Qc4-a6 Qd7-d6
7 208 259 348787 Ra6-a7 Kg7-f6 Kh2-g1
7 209 616 493592 Ra6-e6 Kg7-f7 Re6-c6 Kf7-g7
7 -> 0:11.83 869015 2 turns
8 196 1312 1084606 Ra6-e6 Kg7-f7 Re6-c6 Kf7-g7 Qc4xd4 Pc5xd4
Pg2-g3 Kg7-f7 Pf2-f3 Be7-f6
8 201 1332 1116670 Ra6-a7 !
8 214 1517 1417700 Ra6-a7 Qd4-d6 Qc4-b5 Kg7-f7 Kh2-g1 Qd6-d4
8 -> 0:20.30 2248251 1 turn
9 224 2488 3076577 Ra6-a7 Kg7-f6 Kh2-g1 Qd4-f4 Pg2-g3 Qf4xc4
Pd3xc4 Kf6-e6 Ra7-a6 Be7-d6 Pf2-f3
9 -> 0:35.43 5045409 0 turns
10 228 4514 6654706 Ra6-a7 Kg7-f6 Kh2-g1 Qd4-f4 Pg2-g3 Qf4xc4
Pb3xc4 Kf6-e6 Ra7-a6 Be7-d6 Pf2-f3 Ke6-d7
Kg1-f2
10 -> 1:23.55 12956412 0 turns
11 224 11086 17677455 Ra6-a7 Kg7-f6 Kh2-g1 Qd4-f4 Ra7-a6 Kf6-g7
Pg2-g3 Qf4xc4 Pd3xc4 Kg7-f7 Kg1-g2 Pe5-e4
11 229 13780 22316311 Ra6-e6 !
11 231 16899 27583964 Ra6-e6 Be7-f6 Re6-c6 Bf6-e7 Kh2-g1 Qd4-f4
Pg2-g3 Qf4-g5 Rc6-e6
11 -> 4:18.60 43933285 1 turn
12 231 34158 58765352 Ra6-e6 Be7-f6 Re6-c6 Bf6-e7 Kh2-g1 Qd4-f4
Pg2-g3 Qf4-g5 Rc6-e6
12 232 45113 77271081 Ra6-a7 Kg7-f6 Kh2-g1 Pe5-e4 Ra7-a6
12 -> 11:30.35 118575527 1 turn
13 237 95386 166735674 Ra6-a7 Kg7-f6 Kh2-g1 Qd4xc4 Pb3xc4 Be7-d6
Kg1-f1 Kf6-e6 Pb2-b3 Bd6-f8 Kf1-e1 Bf8-d6
Ke1-d2 Bd6-b8 Ra7-b7
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.