Author: Uri Blass
Date: 03:16:39 11/08/02
Go up one level in this thread
On November 08, 2002 at 03:59:49, Ulrich Tuerke wrote: >On November 07, 2002 at 17:09:58, Gerd Isenberg wrote: > >>On November 07, 2002 at 12:09:49, Ulrich Tuerke wrote: >> >>>The DOS-Comet (on AMD/700) selects Bxg6 immediately and sticks to it although >>>the score keeps on oscillating a bit: >>> >>>Comet-B.50 Thu Nov 7 18:01:04 2002 >>> >>>depth score sec nodes pv >>> 1. +2.29 0 920 c2c6 >>> 2. +1.85 0 1495 c2c6 e8d6 >>> 3. +2.53 0 3989 c2c6 e8d6 h5g4 >>> 4. +2.27 0 16545 h5g6 h7g6 c2g6 e8g7 >>> 4. +2.27 0 18567 h5g6 h7g6 c2g6 e8g7 >>> 5. +2.81 0 53927 h5g6 h7g6 c2g6 e8g7 a1c1 a8c8 c1c2 >>> 5. +2.81 0 56939 h5g6 h7g6 c2g6 e8g7 a1c1 a8c8 c1c2 >>> 6? +2.67 1 372685 h5g6 h7g6 c2g6 e8g7 g6g7 e7g7 g5g6 >>> 6? +2.40 3 625143 h5g6 h7g6 c2g6 e8g7 g6g7 e7g7 a1c1 >>> 6. +2.39 3 687663 h5g6 h7g6 c2g6 e8g7 a1c1 e7d6 >>> 6. +2.39 3 698427 h5g6 h7g6 c2g6 e8g7 a1c1 e7d6 >>> 7? +2.25 4 796132 h5g6 h7g6 c2g6 e8g7 a1c1 >>> 7? +1.98 5 1015341 h5g6 h7g6 c2g6 e8g7 a1c1 >>> 7! +1.98 7 1211842 h5g6 h7g6 c2g6 e8g7 g6h7 g8f7 h1h6 >>> 7. +1.98 7 1211842 h5g6 h7g6 c2g6 e8g7 g6h7 g8f7 h1h6 >>> 8! +2.11 7 1285067 h5g6 h7g6 c2g6 e8g7 g6h7 g8f7 h1h6 >>> 8? +2.11 11 2002215 h5g6 h7g6 c2g6 e8g7 g6h7 g8f7 h1h6 >>> 8. +2.11 14 2362916 h5g6 h7g6 c2g6 e8g7 g6h7 g8f7 h1h6 >>> 9? +1.97 33 6194490 h5g6 h7g6 c2g6 e8g7 g6h7 g8f7 h1h6 >>> 9! +1.97 43 7604098 h5g6 h7g6 c2g6 e8g7 a1c1 f8c8 g6h7 >>> 9. +1.97 43 7604098 h5g6 h7g6 c2g6 e8g7 a1c1 f8c8 g6h7 >>>10! +2.10 47 8511407 h5g6 h7g6 c2g6 e8g7 a1c1 f8c8 g6h7 >>>10? +2.10 134 27955236 h5g6 h7g6 c2g6 e8g7 a1c1 f8c8 g6h7 >>>10. +2.10 148 30110201 h5g6 h7g6 c2g6 e8g7 a1c1 f8c8 g6h7 >>>11. +2.10 200 40603934 h5g6 h7g6 c2g6 e8g7 a1c1 f8c8 g6h7 >>> >>>==> My Move: h5g6 in 3:20 >> >>Hi Uli, >> >>Interesting position, thanks kburcham. Nice for tuning king safety. >> >>IsiChessMMX found it instantly too, at Depth 0 with +2 score! >>Guess blacks king safety penalty after Bxg6 hxg Qxg6+ Ng7 is a bit too huge or >>speculative (new paradigm :-) >>Open h-file with is rather expensive here, two heavy pieces controlling adjacent >>king squares, the white queen near the black king, a pinned knight, domination >>of an adjacent king square (h7), the ability to castle queenside, the g5 passer >>(pawnstorm)... >> >>Oscillating like Comet from +2.48 at depth 5 via +1.75 at 9 and +2.04 at 11. >> >>Regards, >>Gerd > >Hi Gerd, > >agreed. Finding this move is purely a matter of static evaluation. Search and >tactical extensions can't find a quick win here, it seems. > >See you in PB (hopefully), >Uli I disagree I believe that tactical extensions can find that Bxg6 hxg6 Qxg6+ Ng7 Rh7 is good for white. Movei says +0.29 for white at depth 12 for Bg4 depth=12 +0.29 h5g4 e8d6 c2d3 a8c8 a1c1 c6c5 d4c5 b6c5 d3c3 d5d4 e3d4 c5a3 After Bxg6 it shows: depth=8 +0.70 h7g6 c2g6 e8g7 g6h7 g8f7 a3a4 f8g8 b2a3 c6c5 g5g6 f7f8 h7h6 depth=9 +0.65 h7g6 c2g6 e8g7 a1c1 f8c8 g6h7 g8f7 g5g6 f7e8 h7h8 d7f8 e3e4 a5a4 b3a4 a8a4 depth=10 +0.29 h7g6 c2g6 e8g7 a3a4 f8f5 g6h7 g8f7 b2a3 e7e8 a1c1 a8c8 g5g6 f7f6 e3e4 depth=11 +0.56 h7g6 c2g6 e8g7 a3a4 f8f5 b2a3 c6c5 g6h6 g8f7 e3e4 d5e4 d2e4 depth=12 +0.44 h7g6 c2g6 e8g7 a3a4 f8c8 b2a3 c6c5 g6h7 g8f7 g5g6 f7e8 h7h8 e7f8 a1c1 f8h8 h1h8 e8e7 h8h7 e7f6 depth=13 +0.44 h7g6 c2g6 e8g7 a3a4 f8c8 b2a3 c6c5 d2f3 a8b8 g6h6 g8f7 g5g6 f7e8 h6h8 e7f8 h8f8 d7f8 d4c5 b6c5 a3c5 c8c5 After Bxg6 hxg6 is shows depth=8 +0.75 e8g7 g6h7 g8f7 a3a4 a8c8 b2a3 c6c5 a1c1 f7e8 h7g6 e8d8 a3c5 d7c5 d4c5 b6c5 c1c5 e7c5 g6g7 depth=9 +0.29 e8g7 a3a4 f8f5 g6h7 g8f7 b2a3 e7e8 a1c1 a8c8 g5g6 f7f6 e3e4 depth=10 +0.56 e8g7 a3a4 f8f5 b2a3 c6c5 g6h6 g8f7 e3e4 d5e4 d2e4 depth=11 +0.44 e8g7 a3a4 f8c8 b2a3 c6c5 g6h7 g8f7 g5g6 f7e8 h7h8 e7f8 a1c1 f8h8 h1h8 e8e7 h8h7 e7f6 depth=12 +0.44 e8g7 a3a4 f8c8 b2a3 c6c5 d2f3 a8b8 g6h6 g8f7 g5g6 f7e8 h6h8 e7f8 h8f8 d7f8 d4c5 b6c5 a3c5 c8c5 After Ng7 Rh7 it shows depth=7 +0.80 a8a7 a1c1 a7c7 h7h2 c7c8 g6h7 g8f7 e3e4 Nodes: 875216 NPS: 129469 Time: 00:00:06.76 depth=8 -0.90 a8c8 e1e2 d7f6 g5f6 f8f6 g6h5 g7h5 h7e7 Nodes: 6906157 NPS: 130823 Time: 00:00:52.79 depth=9 -2.07 a8c8 g6h6 b6d8 g5g6 e7h4 h6h4 d8h4 h7h4 f8f6 h4h6 g7f5 h6h7 Nodes: 11746058 NPS: 131756 Time: 00:01:29.15 depth=9 -1.36 a5a4 g6h6 b6d8 g5g6 e7h4 h6h4 d8h4 h7h4 a4b3 e3e4 d7f6 d2b3 f6e4 Nodes: 15916290 NPS: 131833 Time: 00:02:00.73 depth=9 -1.04 d7f6 g5f6 e7f6 g6f6 f8f6 h7h1 g7f5 a1c1 a8c8 h1g1 g8h8 Nodes: 17558847 NPS: 131991 Time: 00:02:13.03 depth=9 -1.03 f8f5 g6h6 d7f8 g5g6 f8g6 h6g6 f5f6 g6c2 a8e8 Nodes: 21498826 NPS: 131918 Time: 00:02:42.97 depth=10 -1.07 f8f5 g6h6 d7f8 g5g6 f8g6 h6g6 e7f6 g6f6 f5f6 h7h1 Nodes: 24662748 NPS: 132183 Time: 00:03:06.58 I will need to check what happened to the line Ng7 Rh7 in the previous analysis I guess that it got lost in some bug. You can see that movei can see tactical problems at depth 8 after Ng7 Rh7 It means that programs with the right extensions can see the tactical win for Bxg6 in a short time. Uri
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