Author: Robert Hyatt
Date: 11:05:23 04/29/00
Go up one level in this thread
On April 29, 2000 at 13:29:11, blass uri wrote:
>This position is from the game insomniac0.63-chessmaster6000
>
>[D]6k1/pp2nppp/7r/8/3q4/1P1p1P2/P2P1RP1/RQB3K1 b - - 0 1
>
>Crafty17.10 needs 10 plies to find Nf5 and likes Qh4 with a draw evaluation at
>depth 9 when after Nf5 it needs only 5 plies to see that white is losing.
>
>I know that crafty is a null mover but I thought that null movers do not prune
>more than 3 plies.
>
>Uri
I use R=3 and R=2 depending on depth. But I do it recursively so it is
possible to lose 5-6 plies in wild sacrificial lines.
In this position, it only takes me 8 seconds to find Nf5 even though the depth
is 10. Score is +13. By 40 seconds and depth=12, score=+20.
9-> 1.69 0.00 1. ... Qh4 2. Rf1 Qd4+ 3. Rf2
10 2.32 0.00 1. ... Qh4 2. Rf1 Qd4+ 3. Rf2
10 8.24 ++ 1. ... Nf5!!
10 36.03 13.18 1. ... Nf5 2. Qc2 dxc2 3. d3 Ng3 4.
Bxh6 Ne2+ 5. Kf1 Qxa1+ 6. Kxe2 Qd1+
7. Ke3 c1=Q+ 8. Kd4 Qxh6 9. Kd5 Qxd3+
10. Kc5 <HT>
10-> 36.04 13.18 1. ... Nf5 2. Qc2 dxc2 3. d3 Ng3 4.
Bxh6 Ne2+ 5. Kf1 Qxa1+ 6. Kxe2 Qd1+
7. Ke3 c1=Q+ 8. Kd4 Qxh6 9. Kd5 Qxd3+
10. Kc5 <HT>
11 36.20 ++ 1. ... Nf5!!
(2) 11-> 41.58 13.57 1. ... Nf5 2. Qc2 dxc2 3. d3 Ng3 4.
Bxh6 Ne2+ 5. Kf1 Qxa1+ 6. Kxe2 Qd1+
7. Ke3 c1=Q+ 8. Kd4 Qxh6 9. Kd5 Qxd3+
10. Kc5 <HT>
12 41.85 ++ 1. ... Nf5!!
12 49.16 20.07 1. ... Nf5 2. Qc2 dxc2 3. d3 Ng3 4.
Bxh6 Ne2+ 5. Kf1 Qxa1+ 6. Kxe2 Qd1+
7. Ke3 c1=Q+ 8. Kd4 Qxh6 9. Ke5 Qe3+
10. Kd6 Qdxd3+ 11. Kc7 Qxf2 12. Kxb7
<HT>
In this case, I don't mind taking 8 seconds to find this...
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