Author: Brian Katz
Date: 05:50:11 01/01/04
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On December 31, 2003 at 13:15:31, Stan Arts wrote: >Hello > >Neurosis 1.6 on a P3-550 with 48MB hash. > >Legal moves: 57 Static score: -264 >Ply Score Time Nodes Best move and expected line >------------------------------------------------------------ >2 -12 5 2828 Bxd7+ Qxd7 Rf8+ Rxf8 Rxf8+ Kxf8 >3 95 11 3788 Bxd7+ Qxd7 Rf8+ Rxf8 Rxf8+ Kxf8 Qxd7 >4 95 66 47029 Bxd7+ Qxd7 Rf8+ Rxf8 Rxf8+ Kxf8 Qxd7 >5 95 297 225882 Bxd7+ Qxd7 Rf8+ Rxf8 Rxf8+ Kxf8 Qxd7 >5 96 362 285154 Re1 < + > Qb8 cxd3 Qe5 Rf8+ >5 357 395 322339 Re1 < + > Qa5 Bxd7+ Kd8 Qxe7+ >5 437 417 340859 Re1 Qb6+ Qxb6 axb6 Re1xe7+ Kd8 Rxd7+ Ke8 cxd3 >5 438 730 602556 Kh1 < + > g5 Rxh7 Rg8 Bxd7+ >5 694 769 634206 Kh1 < + > a6 Rxg7 Qa5 Rxe7+ >5 9993 818 672432 Kh1 <M4> a6 Rxg7 Rf8 Rxf8+ Kxf8 Qf7+ >6 9993 1554 1255045 Kh1 <M4> a6 Rxg7 Rf8 Rxf8+ Kxf8 Qf7+ >7 9993 3059 2421708 Kh1 <M4> a6 Rxg7 Rf8 Rxf8+ Kxf8 Qf7+ >Total nodes:4310286 n/sec:78468 (Q-nodes:94453 max depth:15) > >Happy new year, >Stan > > >>[D]r2qk2r/pp1nbRpp/4Q3/1B6/8/3p4/PPP3PP/5RK1 w kq - 0 17 >> >>I came across this position in a blitz game tonight and missed the mate (playing >>Rxg7 instead). My engine (Bogo) takes a full a minute to see the mate: >> >>ply | score | time | nodes | qnodes | line >> 1 | -1.20 | 0.00 | 63 | 120 | cxd3 >> 2+| -0.70 | 0.01 | 211 | 2770 | Re1 >> 2 | -0.18 | 0.00 | 294 | 3582 | Re1 dxc2 >> 3+| 0.32 | 0.02 | 1382 | 6644 | Re1 >> 3 | 1.12 | 0.01 | 2015 | 8505 | Re1 d2 Qxe7+ Qxe7 >> 4 | 1.12 | 0.02 | 2574 | 11943 | Re1 d2 Qxe7+ Qxe7 >> 5+| 1.62 | 0.10 | 12127 | 29661 | Re1 >> 5 | 4.99 | 0.16 | 27376 | 57157 | Re1 Qb6+ Qxb6 axb6 Rexe7+ >> Kd8 Rxd7+ Kc8 >> 6 | 4.99 | 0.11 | 39122 | 80765 | Re1 Qb6+ Qxb6 axb6 Rexe7+ >> Kd8 Rxd7+ Kc8 >> 7 | 5.36 | 1.68 | 227701 | 386042 | Re1 Qb6+ Qxb6 axb6 Rexe7+ >> Kd8 Rxd7+ Kc8 Rc7+ Kd8 Rfd7+ >> Ke8 >> 8 | 5.36 | 1.21 | 373651 | 620391 | Re1 Qb6+ Qxb6 axb6 Rexe7+ >> Kd8 Rxd7+ Kc8 Rc7+ Kd8 Rfd7+ >> Ke8 >> 9+| 5.86 | 15.05 | 2168181 | 3291189 | Kh1 >> 9 | Mat 4 | 41.57 | 7808070 | 11246013 | Kh1 dxc2 Rxg7 Rf8 Rxf8+ >> Kxf8 Qf7# Interesting find. Fritz 8 only finds mate in 4 in the Deep Analysis Mode...Depth Mode but not in the Total Time or Time in the Deep Analysis mode, where it finds mate in 6 and ends search, and the same with the infinite analysis mode. Yace doesn't find it in the Deep Analyis but does in the infinite analysis mode, nor does Ruffian. What is also interesting is that in the infinite analysis mode, allowing only 1 variation for white, (if more than one variation are allowed, the search will take longer) (This is done by using the minus button in the Engine Pane, depressing it until only one line at a time can be looked at, otherwise the engine will show alternative variations which don't show mate or a win. It may even show bad moves for white at the bottom of the analysis as options as well, depending on how many alternative line you allow. That can be done by depressing the Plus button. Each time you press the Plus button, another line of analysis will be added. Each line of analysis will be numbered from 1 on up to however many you allow. Using the MINUS button will bring the variations down. Bring them down until only the number 1 appears next to your LINES of analysis. There will eventually become MANY lines with the Number 1 next to it. These engines find mate in 4 as below: Yace Paderborn: 4 seconds Ruffian 1.0.1 : 2 seconds Ruffian 1.0.0 : 2 seconds Fritz 5.32 : 0 seconds Brian
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