Author: Heiner Marxen
Date: 12:32:34 05/04/02
Go up one level in this thread
On May 04, 2002 at 06:18:09, leonid wrote: >Hi! > >This one should be at reach of every program: > >[D]bbkrNQq1/n1P1R1rQ/n1q1R3/BqpqQNQK/3rQ3/3pP3/3pP3/3qQ2B w - - > >Please indicate your result. > >Thanks, >Leonid. Chest finds mate-in-9 with 5 different key moves. On my K7/600 with 350 MB hash it needs 1.1 hours. PV: cxd8=Q+ Qxd8 Rxc6+ Bxc6 Qe6+ Bd7 Nfd6+ Rxd6 Nxd6+ Bxd6 Qxd7+ Qxd7 Qa8+ Bb8 Bb7+ Qxb7 Qxb7# PV: cxd8=R+ Qxd8 Rxc6+ Bxc6 Qe6+ Bd7 Nfd6+ Rxd6 Nxd6+ Bxd6 Qxd7+ Qxd7 Qa8+ Bb8 Bb7+ Qxb7 Qxb7# PV: Nfd6+ Qcxd6 Nxd6+ Qxd6 cxd8=Q+ Qxd8 Qxb8+ Qxb8 Rc6+ Bxc6 Qxc6+ Nc7 Rxc7+ Qxc7 Qxc7+ Rxc7 Qxc7# PV: Ned6+ Qcxd6 Nxd6+ Qxd6 cxd8=Q+ Qxd8 Qxb8+ Qxb8 Rc6+ Bxc6 Qxc6+ Nc7 Rxc7+ Qxc7 Qxc7+ Rxc7 Qxc7# PV: Qhxg7 Qh8+ Qfxh8 Qxe2+ Qxe2 d1=Q cxb8=Q+ Qxb8 Rxc6+ Qxc6 Qe6+ R4d7 Ned6+ Qbxd6 Qxd8+ Kb7 Nxd6# The last key move 1.Qhxg7 is especially interesting, since it is not forcing. There are 56 legal responses, including checks and promotions. Chest's timing: # 4 0.14s [ 7.00] 6kN [ 7.23] 1.04 684- 0 # 5 0.80s [ 5.71] 39kN [ 6.16] 1.19 4702- 0 # 6 4.90s [ 6.12] 237kN [ 6.10] 1.60 28088- 0 # 7 33.15s [ 6.77] 1792kN [ 7.56] 1.72 178708- 0 # 8 308.43s [ 9.30] 18593kN [ 10.38] 1.76 1542554- 10 # 9 4113.20s [ 13.34] 249731kN [ 13.43] 1.84 19245574- 10498802 Cheers, Heiner
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