Author: Bertil Eklund
Date: 13:07:57 02/28/02
Go up one level in this thread
On February 28, 2002 at 15:41:00, 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?
>
>Yace settles in on a similar idea:
>usetime = 998.00, mintime = 998.00 maxtime = 998.00 tl 998.00 ml 0
> 8 0.000 1.02 1t 1.Qxd4 cxd4 {150}
> 28 0.001 1.30 1t 1.Ra7 {150}
> 61 0.001 1.30 1. 1.Ra7 {150}
> 149 0.002 1.18 2t 1.Ra7 Kf6 {150}
> 350 0.002 1.20 2t+ 1.Qe6 Bd6 {150}
> 413 0.008 1.35 2t 1.Qe6 Qf4+ 2.Kg1 {150}
> 888 0.009 1.35 2. 1.Qe6 Qf4+ 2.Kg1 {150}
> 1028 0.010 0.07 3-- 1.Qe6 Qf4+ 2.g3 Qxf2+ 3.Kh1 Qf3+ 4.Kh2 {70}
> 1170 0.011 0.07 3t 1.Qe6 Qf4+ 2.g3H Qxf2+H 3.Kh1H Qf3+H 4.Kh2H {70}
> 1212 0.011 0.08 3t+ 1.Ra7 Kf6 {150}
> 1556 0.012 1.22 3t 1.Ra7 Kf6 2.Qa6+ Bd6 {150}
> 3482 0.016 1.22 3. 1.Ra7 Kf6 2.Qa6+ Bd6 {150}
> 4703 0.020 1.14 4t 1.Ra7 Kf6 2.Qa6+ Kf7 3.Qb7 {150}
> 7910 0.026 1.15 4t+ 1.f3 Qf4+ 2.Qxf4 Kf7
> 9199 0.031 1.25 4t 1.f3 Qf4+ 2.Qxf4 exf4 3.Re6 {150}
> 10258 0.033 1.25 4. 1.f3 Qf4+ 2.Qxf4 exf4 3.Re6 {150}
> 20183 0.058 1.17 5t 1.f3 h5 2.Ra7 Kf6 3.Qa6+ Bd6 {150}
> 53718 0.134 1.17 5. 1.f3 h5 2.Ra7 Kf6 3.Qa6+ Bd6 {150}
> 61167 0.151 1.11 6t 1.f3 h5 2.Ra7 Kf6 3.Qa6+ Bd6 4.Kh1 {150}
> 68904 0.169 1.12 6t+ 1.Ra7 Kf6 2.Kg1 Qxb2 3.Qh4+ Kg7 4.Rxe7+ Kh8
> {420}
> 73082 0.181 1.17 6t 1.Ra7 Kf6 2.Kg1 h5 3.Qa6+ Bd6 4.Kf1 {150}
> 129101 0.303 1.17 6. 1.Ra7 Kf6 2.Kg1 h5 3.Qa6+ Bd6 4.Kf1 {150}
> 168103 0.396 1.31 7t 1.Ra7 Kf6 2.Kg1 Qxc4 3.bxc4 h5 4.Ra6+ Kf7 5.f3
> {150}
> 254112 0.593 1.32 7t+ 1.Kg1 Qxb2 2.Ra7 Qb1+ 3.Kh2 Kf6 4.Qh4+ Kf7
> 5.Rxe7+ Kf8 {420}
> 324240 0.751 1.41 7t 1.Kg1 Qxc4 2.bxc4 h5 3.f3 Kf7 4.b3 Bd8 {150}
> 355969 0.815 1.41 7. 1.Kg1 Qxc4 2.bxc4 h5 3.f3 Kf7 4.b3 Bd8 {150}
> 492890 1.111 1.40 8t 1.Kg1 Qd7 2.Re6 Bf6 3.Qa6H Qf7H 4.Qc6H h5H {150}
> 709582 1.583 1.40 8. 1.Kg1 Qd7 2.Re6 Bf6 3.Qa6 Qf7 4.Qc6 h5 {150}
> 1048412 2.314 1.40 9t 1.Kg1 Qd7 2.Re6 Bf6 3.Qa6 Qf7 4.Qc6 h5 5.Kf1
> {150}
> 1678765 3.711 1.40 9. 1.Kg1 Qd7 2.Re6 Bf6 3.Qa6 Qf7 4.Qc6 h5 5.Kf1
> {150}
> 2605396 5.839 1.44 10t 1.Kg1 Qxc4 2.bxc4 h5 3.f3 Bg5 4.Kf2 Kf7 5.b3H
> Bf4H 6.Ke2H {150}
> 4800515 10.894 1.44 10. 1.Kg1 Qxc4 2.bxc4 h5 3.f3 Bg5 4.Kf2 Kf7 5.b3
> Bf4 6.Ke2 {150}
> 8080452 18.345 1.50 11t 1.Kg1 Qd7 2.Re6 Bf6 3.Qa6 Qf7 4.Qd6H Bg5H
> 5.Rxe5H f4H {HT} {230}
> 13138812 30.432 1.50 11. 1.Kg1 Qd7 2.Re6 Bf6 3.Qa6 Qf7 4.Qd6 Bg5 5.Rxe5
> f4 {HT} {230}
> 20160577 46.727 1.52 12t 1.Kg1 Qxc4 2.bxc4 h5 3.f3 Kf7 4.Kf2 Bf6 5.b3H
> Bg5H {HT}
> 35385686 1:24.5 1.52 12. 1.Kg1 Qxc4 2.bxc4 h5 3.f3 Kf7 4.Kf2 Bf6 5.b3 Bg5
> 47617005 1:53.1 1.58 13t 1.Kg1 Qxc4 2.bxc4 h5 3.Kf1 Kf7 4.b3 Bf6 5.f3
> Bg5 6.Ke2H {150}
> 85961847 3:29.7 1.58 13. 1.Kg1 Qxc4 2.bxc4 h5 3.Kf1 Kf7 4.b3 Bf6 5.f3
> Bg5 6.Ke2 {150}
> 114580177 4:38.9 1.59 14t 1.Kg1 Qxc4 2.bxc4 h5 3.Kf1 Kf7 4.b3 Bf6 5.Ke2
> Be7 6.Ra7 Ke6 7.Rxe7+H Kxe7H 8.f4H exf4H 9.Kf1H
> {HT} {-80}
Hi!
Century4 plays 3.g4(!) and for me it looks like black is in serious trouble.
So far the score gets up for every ply. A1200 200mb hash.
Bertil
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