Author: Will Singleton
Date: 20:18:36 10/30/02
Go up one level in this thread
On October 30, 2002 at 16:13:36, Gerd Isenberg wrote: >Position from Shark - IsiChessMMX, Leiden Round 10 > >[D] r4rk1/2n1b1pN/pqb1p1Qp/1p6/P1p3n1/N1P1B3/1PB2PPP/R2R2K1 b - - ; bm Rxf2 > >Even if the position is already won by black, finding the spectacular 24...Rxf2 >seems quite difficult for some engines. Ruffian is clearly the fastest i tried >so far on my 2.1XP+ : > >Ruffian 1.0.0 2 seconds >Shredder5 14 seconds >IsiChessMMX 47 seconds > >May be a bad testposition due to Nxe3 wins too. > 4 secs for Amateur 2.4 (amd 1.6ghz). Seems to be related to king-safety, not just search, since Amateur doesn't see the +5 tactics until way late. I do limited checks in qsearch, and it seems to result in big node counts here. 7 296 404 1193086 Rxf2 Nf6 Bxf6 Qh7 Kf8 Rd8 Bxd8 Qh8 8 260 1014 2916551 Rxf2 Nf6 Bxf6 Qh7 Kf8 Bxb6 Rxg2 Kf1 Nxh2 Ke1 Bh4 Bf2 Rxf2 Qh8 Ke7 9 260 2131 6168214 Rxf2 Nf6 Bxf6 Qh7 Kf8 Bxb6 Rxg2 Kf1 Nxh2 Ke1 Bh4 Bf2 Rxf2 Qh8 Ke7 10 256 5037 14674678 Rxf2 Nf6 Bxf6 Qh7 Kf8 Bxb6 Rxg2 Kf1 Nxh2 Ke1 Bh4 Bf2 Rxf2 Rb1 11 564 30676 85349062 Rxf2 Nf6 Bxf6 Qh7 Kf8 Bxb6 Rxg2 Kf1 Nxh2 Ke1 Bh4 Bf2 Rxf2 Rd6 Rxc2 Kd1
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