Author: Tord Romstad
Date: 05:53:11 02/11/06
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Hi Andre, Thanks for your help! Thanks also to H.G. Muller for the interesting comments. On February 11, 2006 at 08:21:22, Andre Reffhaug wrote: >Rybka settles down with mate in 16 after a couple of minutes. Fruit gives Rxh7+ >+21.5 after 10 minutes of thinking, and Hiarcs 10 has a mate in 20 after 13 >minutes. Good to know that there is a forced mate, at least. Nevertheless, after some more testing, I am convinced that I have a bug. In the following position (also from LCT2), Glaurung announces mate in just 7 moves after only a second of thought: [D]2b1r1k1/r4ppp/p7/2pNP3/4Q3/q6P/2P2PP1/3RR1K1 w - - The search output: 2 +34 26 134 Rd3 Qb2 3 +40 26 605 Rd3 Qb2 Rg3 4 +43 26 1404 Rd3 Qb2 Rg3 a5 5 +54 27 5601 Rd3 Qa5 Rg3 Bf5 Nf6+ Kh8 5 +68 28 11070 Re3 Qb2 Rg3 Qxe5 Nf6+ Kf8 Nxh7+ Kg8 6 +51 29 14451 Re3 Qb2 Rg3 Kh8 Rg5 g6 7 +40 33 33900 Re3 Qb2 Rg3 Kh8 Rg5 f6 Rh5 7 +223 34 40308 Nf6+ gxf6 exf6 Rf8 Rd8 c4 Rxc8 Kh8 Qxc4 8 +232 39 63318 Nf6+ gxf6 exf6 Rf8 Rd8 c4 Rxc8 Kh8 Qxc4 a5 9 +864 52 142958 Nf6+ gxf6 exf6 Rf8 Qh4 Qd3 Rxd3 Bf5 Qg5+ Bg6 Qxc5 Bxd3 Qxa7 Bxc2 Qxa6 10 +864 58 175843 Nf6+ gxf6 exf6 Rf8 Qh4 Qd3 Rxd3 Bf5 Qg5+ Bg6 Qxc5 Bxd3 Qxa7 Bxc2 Qxa6 11 +909 73 289161 Nf6+ gxf6 exf6 Rf8 Qh4 Qe3 Rxe3 Bf5 Qg5+ Bg6 Qxc5 Raa8 Rd7 Rab8 12 +1239 103 518008 Nf6+ gxf6 exf6 Rf8 Qf4 Qe3 Qxe3 Bf5 Qxc5 Raa8 Qxf5 Kh8 Re7 Rab8 13 +9987 128 679813 Nf6+ gxf6 exf6 Rf8 Qf4 Qe3 Qxe3 Kh8 Qg5 Rg8 Qxg8+ Kxg8 Rd8# 14 +9987 161 942794 Nf6+ gxf6 exf6 Rf8 Qf4 Qe3 Qxe3 Kh8 Qg5 Rg8 Qxg8+ Kxg8 Rd8# 15 +9987 219 1391173 Nf6+ gxf6 exf6 Rf8 Qf4 Qe3 Qxe3 Kh8 Qg5 Rg8 Qxg8+ Kxg8 Rd8# 16 +9987 333 2314397 Nf6+ gxf6 exf6 Rf8 Qf4 Qe3 Qxe3 Kh8 Qg5 Rg8 Qxg8+ Kxg8 Rd8# 17 +9987 517 3762627 Nf6+ gxf6 exf6 Rf8 Qf4 Qe3 Qxe3 Kh8 Qg5 Rg8 Qxg8+ Kxg8 Rd8# 18 +9987 850 6446616 Nf6+ gxf6 exf6 Rf8 Qf4 Qe3 Qxe3 Kh8 Qg5 Rg8 Qxg8+ Kxg8 Rd8# 19 +9987 1397 11025335 Nf6+ gxf6 exf6 Rf8 Qf4 Qe3 Qxe3 Kh8 Qg5 Rg8 Qxg8+ Kxg8 Rd8# This mate in 7 is obviously incorrect. When I force 1. Nf6+ Kf8, Glaurung no longer sees a mate. Clearly a bug. >I would be very interested in helping you test Glaurung, if there is a need for >it. I'd very much like to see it improve even further (there's a patriotic >streak in me after all.. :) Thanks for the offer! I'll add you to the list of users I send beta versions. Tord
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