Author: Dieter Buerssner
Date: 17:20:06 01/09/03
Go up one level in this thread
On January 09, 2003 at 12:05:00, Kolss wrote:
>On January 09, 2003 at 09:35:16, Andrew Williams wrote:
>
>>Hi,
>>
>>Last night I was looking at a game between Hossa and PostModernist. PM lost
>>after it took the pawn on a2 in this position:
>>
>>r3r1k1/pbpp1pp1/1p3n1p/8/q1PPp3/2P1P1P1/P2BQP1P/1R2RBK1 b - - 0 19 am Qxa2
>>
>>
>>How long does it take your program to ignore the Pawn here? Even after five
>>minutes thinking, PM still wants to take it.
>
>I suppose that your program favors white in this position, which is why it wants
>to take the pawn and draw. Ikarus (V0.29) favors black, so it switches to
>something else after just 1 second (K6/2-475MHz, 8MB Hash), after seeing that
>taking the pawn only draws.
Alsmost the same here with Yace (considering the hardware). The fail low to 0.0
for Qxa2 after 0.15 seconds on P4, 2.53 GHz, and another move under 0.2 seconds.
>If I play Qxa2 (after clearing hash), Ikarus needs quite long (9 seconds / 13
>plies) to see that white is winning (+1.80).
Again similar, but a slower (considering the hardware again). Failing high after
8.x seconds/ 13 plies ...
3447109 3.901 0.00 12. 20. Ra1 Qc2 21. Rec1 Qb3 22. Rcb1 Qc2 23. Rc1
{-70}
7294969 8.395 0.40 13++ 20. Ra1 Qc2 21. Rec1 Qb3 22. Be1 d5 23. c5 bxc5
24. Rcb1 Qc4 25. Qxc4 cxd4 {771}
9605067 11.458 1.40 13++ 20. Ra1 Qc2 21. Rec1 Qb3 22. Be1 d5 23. Qd2
dxc4 24. Rcb1 a5 25. Rxb3 cxb3 {351}
12885392 15.814 1.74 13t 20. Ra1 Qc2 21. Rec1 Qb3 22. Be1 Nd5 23. Rab1
Qa3 24. cxd5 Bxd5 25. c4 Bb7 26. Bb4 Qa4 {190}
14222569 17.176 1.74 13. 20. Ra1 Qc2 21. Rec1 Qb3 22. Be1 Nd5 23. Rab1
Qa3 24. cxd5 Bxd5 25. c4 Bb7 26. Bb4 Qa4 {190}
26712828 30.585 1.93 14t 20. Ra1 Qc2 21. Rec1 Qb3 22. Be1 Nd5 23. Rab1
Qa3 24. cxd5 Bxd5 25. c4 Bb7 26. Bb4 Qa4 27.
Qh5 {190}
28320021 32.713 1.93 14. 20. Ra1 Qc2 21. Rec1 Qb3 22. Be1 Nd5 23. Rab1
Qa3 24. cxd5 Bxd5 25. c4 Bb7 26. Bb4 Qa4 27.
Qh5 {190}
50057433 59.311 1.82 15t 20. Ra1 Qc2 21. Rec1 Qb3 22. Be1 Nd5 23. Rab1
Qa3 24. cxd5 Bxd5 25. Qa6 Qxa6 26. Bxa6 Rab8H
27. Rb2H d6H 28. Rcb1H {190}
76707595 1:34.8 1.82 15. 20. Ra1 Qc2 21. Rec1 Qb3 22. Be1 Nd5 23. Rab1
Qa3 24. cxd5 Bxd5 25. Qa6 Qxa6 26. Bxa6 Rab8
27. Rb2 d6 28. Rcb1 {190}
127763805 2:40.7 2.22 16++ 20. Ra1 Qc2 21. Rec1 Qb3 22. Be1 Nd5 23. Rcb1
Nxc3 24. Bxc3 Qxc3 25. Qd1 d5 26. Rb3 Bc6 27.
Rxc3 dxc4 {761}
167036224 3:39.0 2.25 16t 20. Ra1 Qc2 21. Rec1 Qb3 22. Be1 Bd5 23. Qd2
Bxc4 24. Rcb1 Qxb1 25. Rxb1 Bxf1 26. Kxf1 d5
27. Qb2 a6 28. Bd2 Ng4 {351}
179263842 3:57.5 2.25 16. 20. Ra1 Qc2 21. Rec1 Qb3 22. Be1 Bd5 23. Qd2
Bxc4 24. Rcb1 Qxb1 25. Rxb1 Bxf1 26. Kxf1 d5
27. Qb2 a6 28. Bd2 Ng4 {351}
>I suppose that giving queens a malus
>when their mobility is very low is important to avoid these traps - or at least
>to do better when they are involved.
I did not like, what I saw, when scoring the Q too much. It makes the Q nervous,
doing many moves, to improve her position. But probably I did not find the right
scoring.
Regards,
Dieter
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