Author: Heiner Marxen
Date: 13:14:51 08/13/01
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On August 13, 2001 at 11:53:23, leonid wrote: >Hi! > >This position is easy: > >[D]B2N1qr1/B2Qb2q/Q2Rq3/Q2Q1q2/Q2Q2q1/Q2Q3n/R2Qq2k/1KN2rq1 w - - Hello Leonid, As far as I can see, this is still the same position in your "correction" (i.e. you only changed the second position). Well, the above is a mate in 8, according to Chest, which needed no less than 1.1 hours (and 350 MB hash) to find one solution: PV: Qxg1+ Qxg1 Bxg1+ Rfxg1 Qxe2+ Qf2 Qee5+ Qf4 Rxf2+ R1g2 Rxg2+ Kh1 Rh2+ Kg1 Qh1# Since all white moves are checking, your selective search should find this also with depth 8, already, and much faster than Chest. >Actually original position was this that I changed in order of having more >accessible one. > >[D]B2B1qr1/N2Qb2q/Q2Rq3/Q2Q1q2/Q2q2q1/Q2Q3n/R2Qq2k/1KN2rq1 w - - > >This last position look like very innocent, since it have initially only 93 >moves, but take care! When I put it on one professional program, where special >mate solving engin was asked to do the work, response was deadly. It reacted on >"US" script like true fanatic from the Middle East. Beside committing >Selbstmord-Anschlag on the spot it killed my Windows ME as well. As is above (i.e. not corrected) Chest quite quickly finds "no mate in 8" (159 seconds). I did not continue this one. I'll followup to the corrected version there. Cheers, Heiner
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