Author: Frank E. Oldham
Date: 17:36:30 03/01/04
Go up one level in this thread
On March 01, 2004 at 18:01:21, Albert Silver wrote:
>I had the pleasure of playing the following rook sac in a blitz game a short
>while ago. Since it turned out to be correct, I submit it to the engine fiends.
>It resists some engines a bit on my old hardware, so it might make an
>interesting addition to some test suite.
>
>[D]r2r2k1/ppq1bp2/2p1pnpB/8/1PP5/P1N3RP/2P1QPP1/4R1K1 w - -
>
>The key move is (rather obvious for a human though it needs to be worked out)
>1.Rxg6! followed by fxg6 2.Qxe6+ Kh7 3.Qf7+ Kxh6 4.Rxe7 Qd6 5.Qg7+ followed by
>the knight joining in.
>
>In the game my opponent dropped the knight with 4...Qc8 and resigned.
>
> Albert
Crafty 19.10 just doesn't like the sacrifice idea ;-)
It takes until depth 14 to find it -- Junior liking it at depth 9 is amazing --
9-> 1.26 1.74 1. Rf3 a5 2. Bf4 Qd7 3. Rd1 Qc8 4.
Rxd8+ Qxd8 5. Rd3 Qf8 6. Be5 axb4 7.
axb4 (s=3)
10 1.77 1.77 1. Rf3 a5 2. Bf4 Qd7 3. Be5 Nh5 4.
Rd1 Qe8 5. Rxd8 Rxd8 6. c5 (s=2)
10-> 2.74 1.77 1. Rf3 a5 2. Bf4 Qd7 3. Be5 Nh5 4.
Rd1 Qe8 5. Rxd8 Rxd8 6. c5 (s=3)
11 6.49 1.73 1. Rf3 Rd7 2. Bg5 Nh5 3. Bxe7 Rxe7
4. Rd1 Rd8 5. Rxd8+ Qxd8 6. Qe3 b6
7. Qg5 Rd7 (s=2)
11-> 11.31 1.73 1. Rf3 Rd7 2. Bg5 Nh5 3. Bxe7 Rxe7
4. Rd1 Rd8 5. Rxd8+ Qxd8 6. Qe3 b6
7. Qg5 Rd7 (s=2)
12 32.76 1.63 1. Rf3 Rd4 2. b5 Rd7 3. Bg5 Qd8 4.
a4 Nh5 5. Be3 Bd6 6. bxc6 bxc6 7. Bh6
12-> 1:05 1.63 1. Rf3 Rd4 2. b5 Rd7 3. Bg5 Qd8 4.
a4 Nh5 5. Be3 Bd6 6. bxc6 bxc6 7. Bh6
(s=3)
13 1:44 1.67 1. Rf3 Rd7 2. Bg5 Qd8 3. Na4 b6 4.
Bh6 a5 5. Be3 Rb8 6. Bf4 Bd6 7. Bxd6
Rxd6 (s=2)
13-> 2:56 1.67 1. Rf3 Rd7 2. Bg5 Qd8 3. Na4 b6 4.
Bh6 a5 5. Be3 Rb8 6. Bf4 Bd6 7. Bxd6
Rxd6 (s=2)
14 5:01 1.66 1. Rf3 Rd4 2. Be3 Rd7 3. Bg5 Qd8 4.
Na4 b6 5. Bh6 Rd4 6. c3 Re4 7. Re3
Rxe3 8. Qxe3 <HT>
14 6:24 ++ 1. Rxg6+!!
14 7:11 2.63 1. Rxg6+ fxg6 2. Qxe6+ Kh7 3. Qf7+
Kxh6 4. Rxe7 Qd6 5. Qg7+ Kg5 6. Ne2
Rh8 7. c5 Qd1+ 8. Kh2 Qa1 9. f4+ Kf5
10. Re5+ Qxe5 11. fxe5 Ng4+ 12. Kg3
Nxe5 13. Qxb7
14-> 7:13 2.63 1. Rxg6+ fxg6 2. Qxe6+ Kh7 3. Qf7+
Kxh6 4. Rxe7 Qd6 5. Qg7+ Kg5 6. Ne2
Rh8 7. c5 Qd1+ 8. Kh2 Qa1 9. f4+ Kf5
10. Re5+ Qxe5 11. fxe5 Ng4+ 12. Kg3
Nxe5 13. Qxb7 (s=2)
15 8:24 2.74 1. Rxg6+ fxg6 2. Qxe6+ Kh7 3. Qf7+
Kxh6 4. Rxe7 Qd6 5. Qg7+ Kg5 6. Ne2
Rh8 7. c5 Qd1+ 8. Kh2 Qa1 9. f4+ Kf5
10. Re5+ Qxe5 11. fxe5 Ng4+ 12. Kg1
Nxe5 13. g4+ Ke4 14. Qxb7
15-> 8:36 2.74 1. Rxg6+ fxg6 2. Qxe6+ Kh7 3. Qf7+
Kxh6 4. Rxe7 Qd6 5. Qg7+ Kg5 6. Ne2
Rh8 7. c5 Qd1+ 8. Kh2 Qa1 9. f4+ Kf5
10. Re5+ Qxe5 11. fxe5 Ng4+ 12. Kg1
Nxe5 13. g4+ Ke4 14. Qxb7
time=8:36 cpu=395% mat=1 n=1370692317 fh=92% nps=2.66M
ext-> chk=58001759 cap=3294306 pp=293332 1rep=5509951 mate=376022
predicted=0 nodes=1370692317 evals=299470745
endgame tablebase-> probes=0 hits=0
SMP-> split=2056 stop=369 data=9/32 cpu=33:59 elap=8:36
Nicely played!
Frank
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