Author: Howard Exner
Date: 14:54:40 01/18/99
Go up one level in this thread
On January 18, 1999 at 09:21:10, Mark Young wrote: >On January 18, 1999 at 08:57:18, Howard Exner wrote: > >>On January 17, 1999 at 20:40:47, allan johnson wrote: >> >>>Richard I'm sorry but I'm not familiar with EPD but I'll provide 3 examples >>> from the book. >>> Example46 >>> White Kg1 Qh5 R-d1,e1 B-g3,N-e5,Ps-a2,d4,f2,g2,h4 >>> Black Kg7 Qd8 R-f8,c3 Bd7 Nb6 Ps-a6,b7,d5,f7,g5,h6 >>> Key move Nxf7! Rebel plays R-b1 >> >>Here Rb1 does not look so bad either. It gets a big plus score as it >>now also threatens Nxf7. This one is #730 in ECM98 (the project done here in CCC >>awhile back). The forcing line given as winning is 1.Nxf7 Rxf7 2.Be5+ Rf6 3.hxg5 >>hxg5 >>4.Qg5+ Kf7 5. Qh5+ Kg8 6. Rb1! (note this move showing up now but try entering >>it in >>first to compare the evals) >> >>> >>> Example 52 >>> White Kg1 Qf3 R-c1,e4 B-b3,g5 Ps-a2,b2,f2,g3,h4 >>> Black Kg8 Qf8 R-a8,h8 Bd4 Nb6 Ps-a7,c5,f7,g6,h5 >>> Key move Re7 Rebel Be7 >> >>This is a position from Alehkine - Opocensky, 1925. In Alehkine's book, "My Best >>Games Of Chess 1908-1937" he plays the winning line 1.Rxd4! cxd4 Rc6 ... >>I think the move Re7 is not as good as what Alehkine really played. Rebel 10 on >>my AMD-233 plays Rxd4 >>in 0:10. >> >>> >>> Example 274 This position really highlights the passivity of most chess >>> computer programmes I believe! >>> >>> White Kg1 Qf4 R-d2,e1 Bf1 N-g4,g5 Ps-a4,b3,c2,e5,f2,g3,h6 >>> Black Kg8 Qe7 R-c3,a8 Bc8 N-c6,d7 Ps-a6,b4,d5,e6,f7,g6,h7 >>> Key move Rxd5!! Rebel 10 plays Bg2 >> >>This is another one from ECM98, #465. I recall we discussed this but the line >>starting with Rxd5 held up. 1. Rxd5 exd5 2. e6 fxe6 3. Rxe6 Qf8 4. Qxf8 Kxf8 >>5.Nxh7+ Kg8 6. Ng5 ... >> >> >>> Iwould love to write in EPD so I'd appreciate any help in that area >> >>If you like the ECM98 suite can be downloaded from Manfred Rosenboom's >>chess site. In that suite Amir Ban (Junior), Bruce Moreland (Ferret), >>myself (Using the actual book for help) and a host of others attempted >>to remove the problems that were vague or had faulty solutions. It contains many >>nice positions, like the third one you posted for example, that are >>challenging for chess programs. > >Is there a big test set of nothing but positions with only one winning line. I >don't like positions that have many moves with +5 or +6 scores to them and all >winning. A flashy sac is nice to see, but if other moves win just as easy..., >The computer does not care about winning in style and may not find the key move. I think the ECM98 suite is a good start. I view this suite as still an ongoing project in the sense that anyone here can still contribute their assessment as to whether or not the line given is correct. I'm sure we missed some, chess being the complex game that it is. ECM98 is not the same as the ECM suite. It is that suite with about 150 less positions that were removed because they were vague, faulty or simply found in a split second by a majority of programs.
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