Author: Dan Newman
Date: 04:25:17 01/02/00
Go up one level in this thread
On December 30, 1999 at 18:17:42, José Carlos wrote:
> As many of you, I'm trying to compile my own set of test positions for my
>program. I find this specially difficult and interesting.
>
>6k1/r4pp1/2Q1b2p/p1bNp3/4P3/5R1P/1qB2PPK/8 b - - 0 1
>
> If black takes the bishop, he gets mated: 1... Qc2 2 Nf6 gf6 3 Qe8 any 4 Rg3
>
> Do your programs take the evel bishop...?
>
> José C.
Interesting position. Mine (Shrike) initially likes the capture. It takes a
while but eventually the score takes a dive when it starts throwing away
pieces to push the mate over the horizon.
Here's what it got on a PIII/500:
8. 268 0.93 318574 Qxc2 Rc3 Qxf2 Rxc5 Qd4 Qb6 Ra6 Qb8+ Kh7
8> 268 1.15 455360 Qxc2 Rc3 Qxf2 Rxc5 Qd4 Qb6 Ra6 Qb8+ Kh7
9. 270 1.70 756855 Qxc2 Rc3 Qxf2 Rxc5 Qd4 Rc4 Qd3 Qe8+ Kh7 Rc7
Rxc7 Nxc7 Qxe4 Nxe6 fxe6 Qxe6
9> 270 2.25 1043201 Qxc2 Rc3 Qxf2 Rxc5 Qd4 Rc4 Qd3 Qe8+ Kh7 Rc7
Rxc7 Nxc7 Qxe4 Nxe6 fxe6 Qxe6
10. 170 16.80 8544010 Qxc2 Rc3 Qxf2 Rxc5 Qd4 Rc4 Qd3 Qe8+ Kh7 Rc7
Rxc7 Nxc7 Qxe4 Nxe6 fxe6 Qxe6
10. -379 17.35 8805607 Qxc2 Nf6+ gxf6 Qe8+ Kh7 Rg3 Ra8 Qxa8 Bg4 Rxg4
Bf8 Qxf8 Qxf2 Qxf7
10+ -329 18.78 9546387 Bxd5
10. -163 19.55 9971127 Bxd5 Qxc5 Be6 Qxa7 Qxc2 Qb8+ Kh7 Qxe5 Qa2 Rg3
f6 Qh5 Qxf2 Qxa5
10+ -113 23.44 12079623 Bxf2
10. -20 1:07 33142270 Bxf2 Rxf2 a4 Rf1 a3 Rb1 Qd4 Rb4 Qf2 Rb8+
Kh7 Kh1
10+ 30 1:17 38173983 Bf8
10. 168 1:22 40969800 Bf8 Rb3 Qd4 Rb8 Qxf2 Qd6 Kh7 Rxf8 Qxc2 Qxe5
10> 168 1:26 43228068 Bf8 Rb3 Qd4 Rb8 Qxf2 Qd6 Kh7 Rxf8 Qxc2 Qxe5
11. 130 1:30 44993273 Bf8 Rb3 Qd4 Rb8 Qxf2 Nc7 Qf4+ Kh1 g6 Nxe6
fxe6 Qxe6+ Kg7 Bd3
11> 130 2:11 65595032 Bf8 Rb3 Qd4 Rb8 Qxf2 Nc7 Qf4+ Kh1 g6 Nxe6
fxe6 Qxe6+ Kg7 Bd3
nodes: 65595032, fw: 17572414, q: 48022618
exts: check: 2218610, one_reply: 61513, mate_threat: 2366
null_move_cutoffs: 8680186
ttable probes: 17567349, hits: 4771836, 27.1631 %
pawn hash probes: 48022614, hits: 47943303, 99.8348 %
elapsed time: 131.82 s, node rate: 497.611 knps
-Dan.
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