Author: Anthony Cozzie
Date: 11:34:10 11/16/02
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On November 16, 2002 at 10:34:14, Steffen Basting wrote: >Hi! >A position of a game I played: >[D] 4n3/2q3kb/1p6/2p1P1p1/1PPp1QNb/7B/7P/B5K1 w - - 0 1 > >How long does it take your engine to play Nf6 and then Fail Low on it? > >Regards, Steffen A hard an interesting position! 1. Nf6 Bg6 2. Nxe8 Bxe8 3. Qf6 Kh7 4. Bf5 Kg8 5. Be6 Kh7 6. Bf5 Kg8 7. Be6 Kh7 = (0.00) Depth: 9 00:00:04.57 1097kN 1. Nf6 Bg6 2. Nxe8 Bxe8 3. Qf6 Kh7 4. Bf5 Kg8 5. Be6 Kh7 6. Bf5 Kg8 7. Be6 Kh7 = (0.00) Depth: 10 00:00:06.92 2119kN 1. Nf6 Bg6 2. Nxe8 Bxe8 3. Qf6 Kh7 4. Bf5 Kg8 5. Be6 Kh7 6. Qf8 Kg6 7. Qxe8 Kg7 8. bxc5 + (0.25) Depth: 11 00:00:09.08 3015kN 1. Nf6 Bg6 2. Nxe8 Bxe8 3. Qf6 Kh7 4. Bf5 Kg8 5. Be6 Kh7 6. Qf8 Qxe5 7. Qg8 Kh6 8. Qf8 Kh7 9. Qg8 Kh6 10. Qf8 = (0.00) Depth: 11 00:00:11.13 3912kN 1. Nf6 Bg6 2. Nxe8 Bxe8 3. Qf6 Kh7 4. Bf5 Kg8 5. Be6 Kh7 6. Qf8 Qxe5 7. Qg8 Kh6 8. Qf8 Kh7 9. Qg8 Kh6 = (0.00) Depth: 12 00:00:25.77 10308kN 1. Qf3 Qf7 2. Qd5 Bg6 3. bxc5 bxc5 4. e6 Qf4 5. Bb2 Qd2 6. Qd7 Kh8 7. Ba3 Qd1 8. Kg2 = (-0.02) Depth: 13 00:05:38.33 146460kN 1. Qf3 Bg8 2. Qa8 Qe7 3. bxc5 bxc5 4. Qa3 = (-0.12) Depth: 14 00:14:25.82 372516kN I think the interesting thing here is Zappa's rudimentary king safety evaluation. While most engines see the attack after 1. Nf6 Bg6 2. Nxe8 Bxe8 3. Qf6 as a bold thrust, Zappa sees it as a draw in an attempt to save a losing position! That is also one of the largest single ply branching factors I have seen since I fixed up my transposition table. 14x as many nodes at 13 ply as 12 ply.
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