Author: Art Basham
Date: 06:20:56 12/16/02
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Hi Mike.... Thanks! I thought it was a good test move...to see if our computer programs "think" like a grandmaster thinks...etc. It is taken from the "Test Your chess I Q" Book One, by Al Livshitz...(just loaded with neat test moves)! The players were Bakulin vrs. Bronstein... played at Kiev in 1965... regards Art ===================== On December 16, 2002 at 00:47:21, Mike S. wrote: >On December 15, 2002 at 22:32:30, John Merlino wrote: > >>On December 15, 2002 at 21:57:45, Art Basham wrote: >> >>>Gambit Tiger takes 11 ply to find.... >>>1.....Bd3! (Opening the g file for the Rook)... >>>If 2. QxB, Rg1+ wins for black! >>>[D]2k1r1r1/1pb2p2/p5b1/2qP4/2P2P2/4pP1p/P3Q2P/2RBRN1K b - - 0 1 >> >>CM9000, on a P3-733, finds it in five seconds: >> >>Time Depth Score Positions Moves >>(...) >>0:05 1/8 -4.58 394611 1...Bd3 2.Qxd3 Rg1+ 3.Kxg1 e2+ >> 4.Ne3 Rxe3 5.Kh1 Rxd3 6.Rxe2 Rxd5 >> 7.cxd5 Qxc1 >>0:07 1/9 -4.53 599248 1...Bd3 2.Qxd3 Rg1+ 3.Kxg1 e2+ >> 4.Ne3 Rxe3 5.Kh1 Rxd3 6.Rxe2 Rxd5 >> 7.cxd5 Qxc1 8.Re8+ Kd7 >>0:15 1/10 -5.27 1282458 1...Bd3 2.Qxd3 Rg1+ 3.Kxg1 e2+ >> 4.Ne3 Rxe3 5.Kh1 Rxd3 6.Bxe2 Qf2 >> 7.Bf1 Qxf3+ 8.Kg1 Qxf4 9.Rc2 >>0:57 2/11 -7.60 4797308 1...Bd3 2.Ng3 Bxe2 3.Nxe2 Ba5 4.Rf1 >> Bd2 5.Rc2 Rg2 6.f5 b6 7.f4 >>1:45 3/12 -7.72 9335773 1...Bd3 2.Ng3 Bxe2 3.Nxe2 Ba5 4.Rf1 >> Rg2 5.Ba4 Re7 6.Rc2 Qa3 7.Bb3 f5 >>5:03 4/13 -7.81 29015675 1...Bd3 2.Ng3 Bxe2 3.Nxe2 Rg2 4.Bc2 >> Ba5 5.Bf5+ Kb8 6.Bxh3 Rf2 7.Nc3 >> Qxc4 8.Ne4 Qxa2 >> >>You should note that different programs report their search depth differently. >>Fritz, from what I've been told, reports the MAXIMUM extension depth for the >>given PV, whereas CM reports the MINIMUM extension depth. Other programs, like >>Gambit Tiger, might do something different. > >I assume you mean the second number, which is displayed after the slash. I >always wondered how The King remains in small depths (I mean the value before >the slash), but still sees much, like above. > >Is it correct that the number before the slash basically is meant to be the >"complete" of the search depth basically, while after the slash the extension's >depth - min. or max. - is given? > >(I'm aware that "complete" will include forward pruning etc. too.) > >Another question (to Art), this seems a very nice tactical test position. Do you >have source infos (game, tournament etc.)? > >Thanks, >M.Scheidl > > >P.S. List 5.04, P3/700 Mhz, 64 MB hash: > >Analysis by List 504: > >1...Qa3 2.Bc2 Bxf4 3.Bxg6 Rxg6 4.Red1 > ³ (-0.53) Depth: 5 00:00:00 8kN > ³ (-0.40) Depth: 5 00:00:00 10kN >1...Bxf4 2.Rc3 Re5 3.Bb3 Kb8 4.Rxe3 Bxe3 5.Nxe3 Qd6 > µ (-0.80) Depth: 5 00:00:00 11kN > -+ (-1.72) Depth: 9 00:00:03 1139kN >1...Qd4 2.f5 Bxf5 3.Nxe3 Bd3 4.Qf2 Rg2 5.Nxg2 hxg2+ 6.Kxg2 Rg8+ 7.Qg3 Qb2+ 8.Be2 > -+ (-2.12) Depth: 9 00:00:04 1631kN > -+ (-3.56) Depth: 12 00:00:20 8381kN >1...Bd3 2.Ng3 Bxe2 3.Nxe2 Rg2 4.Ba4 Rh8 5.Bc2 Ba5 6.Nc3 e2 7.Bf5+ Kb8 > -+ (-3.96) Depth: 12 00:00:22 9337kN > -+ (-7.45) Depth: 14 00:01:53 51117kN
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