Author: Rick Bischoff
Date: 11:26:25 10/15/04
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On October 15, 2004 at 13:36:10, Michael Henderson wrote: >What search extensions do you use? > >Michael Check, mate and pawn to 7th.. They are limited to 1 per ply (i.e., so if I had check+pawn extension it would only count once). I ran a depth 10 search on the same position and see that... 8 153 1500 2021166 1. Ne5 Qxb3 2. Nxd7+ Kc8 3. axb3 Kxd7 4. Rxa7 Rb6 5. c4 9 143 6805 8575949 1. Ne5 Qxb3 2. axb3 Bxb5 3. Nxg6 Nxg6 4. Ra5 Bd7 5. Kf1 9 152 19272 25158409 1. b6 axb6 2. Ne5 Kc8 3. Nxg6 hxg6 4. Qxe6 Bxe6 5. Bf4 10 138 46699 59974894 1. b6 axb6 2. Ne5 Kc8 3. Nxg6 hxg6 4. Qxe6 Bxe6 5. f3 Bd5 10 147 48685 62684081 1. Ne5 Qxb3 2. Nxd7+ Kc8 3. axb3 Kxd7 4. Rxa7 Rb6 5. c4 Rd6 6. Bb2 move Ne5 199,467,498 nodes 1586.72 seconds (125710 NPS) 2649176 nullmove try 1655986 nullmove succeed (%62.5095) * check 7738819 * * mate 254 * * pawn 1386764 * which seems very high for the pawn extension. I disabled it and ran it again (this is quite painful, only 125Knps, ugh): 8 153 1237 1748333 1. Ne5 Qxb3 2. Nxd7+ Kc8 3. axb3 Kxd7 4. Rxa7 Rb6 5. c4 9 143 5427 6866480 1. Ne5 Qxb3 2. axb3 Bxb5 3. Nxg6 Nxg6 4. Ra5 Bd7 5. Kf1 9 151 15181 20417976 1. b6 axb6 2. Ne5 Rf6 3. Qxe6 Bxe6 4. Bg5 Rhf8 5. Bxf6 Rxf6 10 138 39492 49753703 1. b6 axb6 2. Ne5 Kc8 3. Nxg6 hxg6 4. Qxe6 Bxe6 5. f3 Bd5 10 147 48721 60633789 1. Ne5 Qxb3 2. Nxd7+ Kc8 3. axb3 Kxd7 4. Rxa7 Rb6 5. c4 Rd6 6. Bb2 move Ne5 144,735,761 nodes 1212.71 seconds (119349 NPS) 2234792 nullmove try 1442400 nullmove succeed (%64.5429) * check 4874624 * * mate 231 * * pawn 0 *
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