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Subject: Re: a couple of hard positions (material gain that disappears)

Author: William Bryant

Date: 15:47:07 06/12/01

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On June 12, 2001 at 10:22:52, Jon Dart wrote:

>Here are a couple of positions from recent Arasan games:
>
>1n2r3/5Nk1/p4b2/2Qp3p/6p1/P5P1/P1B1q1PP/6RK b - -
>
>Here taking the piece with Kxf7 is fatal. It appears
>however that after Be7! Black doesn't have anything better
>than a draw.
>

Screamer b58 avoids this pretty quick and _eventually_ settles on Qe6 although
it would probably play Be7 at tournament time controls.

(500mhz G4 laptop)
New Board Position
1n2r3/5Nk1/p4b2/2Qp3p/6p1/P5P1/P1B1q1PP/6RK b - -
PLY          NODES       TIME      SCORE  PV
______________________________________________________________
 5/00        19413       0.214        --
 5/00        36308       0.411     -0.32  Kxf7 Qxd5+ Qe6 Qxh5+ Kf8 Bb3 Qd7
 5/23        64596       0.705        ++  Be7
 5/23        68920       0.760     -0.82  Be7 Qd4+ Kxf7 Qxd5+ Kf8 Bg6 Rd8 Qxh5
Bxa3
 6/00        83612       0.927        --
 6/00       105563       1.158     -0.22  Be7 Qd4+ Kxf7 Qxd5+ Kg7 Bd3 Qe3 Qxh5
 6/01       137586       1.454     -0.27  Kxf7 Qxd5+ Kg7 Qxh5 Kf8 Qh6+ Bg7 Qc1
 7/00       305687       3.023     +0.21  Kxf7 Qxd5+ Kg7 Qxh5 Kf8 Bb3 Re7 h4
 7/01       422302       4.065     -0.22  Be7 Qd4+ Kxf7 Qxd5+ Kg7 Bd3 Qe3 Qxh5
Kf8
 8/00       862794       8.361     +0.00  Be7 Qd4+ Bf6 Qc5
 8/02      1170706      11.304     -0.05  Nd7 Qc7 Re7 Nd6 Kg8 Nf5 Rh7 Rc1
 9/00      2495131      23.863        --
 9/00      3428758      32.809     +0.83  Nd7 Qc7 Qf2 Nd6 Rd8 Rd1 Kg8 Bb3 Nb6
Bxd5 Nxd5 Rxd5 Qxa2
 9/01      4145990      39.205        ++  Be7
 9/01      4782378      44.975     +0.00  Be7 Qxd5 Qxc2 Qe5+ Kxf7 Rf1+ Kg6 Qe6+
Kg5 Qe3+ Kg6 Qe6+
10/00      8314838      77.911        --
10/00     14363840     139.364     +0.70  Be7 Qd4+ Bf6 Qxd5 Qxc2 Nd6 Qg6 Nxe8+
Qxe8 Qb7
10/06     27611555     273.875     +0.56  Qd2 Nd6 Re1 Nf5+ Kf7 Nh6+ Kg7 Qc7+ Be7
Nf5+ Kf7 Bd3 a5 Rxe1 Qxe1
10/11     34604315     341.762     +0.13  Qe6 Nd6 Rd8 Nf5+ Kh8 Qa7 Rc8 Bd3 Be5
Nd4 Bxd4 Qxd4
11/00     41904433     409.148     +0.18  Qe6 Nd6 Rd8 Nf5+ Kg8 Qa5 Nd7 Nh6+ Kg7
Re1 Qc6 Ba4 Qb7
12/00     78005018     759.039     +0.27  Qe6 Nd6 Rd8 Nf5+ Kg8 Bd3 Nc6 Qb6 a5
Nh6+ Kg7 Bf5 Qe8 Rc1
     Total Search Time: 900 seconds
     Move: Qe6

>This one is an opening trap sprung by the program
>"Postmodernist":
>
>rn1qk1nr/ppp3pp/5p2/2bP1bB1/3p4/1Q3N2/PP2PPPP/RN2KB1R w KQkq -
>

Screamer takes forever to no play this.  I need more Endgame knowledge.
11/02     81546723     841.663     -0.08  Bf4 Ne7 e3 Bxb1 Rxb1 dxe3 fxe3 Qxd5
Bc4 Qe4 Rd1 Nf5 Bxc7 Bxe3


William




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