Author: Harald Faber
Date: 22:40:12 08/11/02
Go up one level in this thread
On August 11, 2002 at 14:26:38, John Merlino wrote: >On August 11, 2002 at 06:49:12, Harald Faber wrote: > >>On August 10, 2002 at 21:53:49, John Merlino wrote: >> >>>Here is a position from a game that Slater and I discussed in a different >>>thread: >>> >>>[D]3R4/8/8/8/2K5/6p1/3p1rk1/8 b - - 0 78 >>> >>>In that game, Black was obviously using EGTBs and played 78...d1=Q, leading to >>>an EGTB mate in 22 moves (including the promotion). However, the more natural >>>looking move, Kf1, leads to a mate in 14, as Chessmaster 9000 shows on a >>>PIII-733: >>> >>>Time Depth Score Positions Moves >>>0:00 1/5 -8.88 14450 78...Kf1 79.Kc3 g2 80.Rd4 g1=Q >>> 81.Rxd2 Rxd2 82.Kxd2 >>>0:00 2/6 -9.00 26438 78...Kf1 79.Kc3 g2 80.Rxd2 Rxd2 >>> 81.Kxd2 g1=Q 82.Kd3 Qc5 83.Ke4 Ke2 >>>0:00 3/7 -9.00 74581 78...Kf1 79.Kc3 g2 80.Rxd2 Rxd2 >>> 81.Kxd2 g1=Q 82.Kd3 Qc5 83.Ke4 Ke2 >>>0:02 4/8 -11.19 264563 78...Kf1 79.Kc3 Ke1 80.Kc4 g2 81.Re8+ >>> Re2 82.Rg8 d1=Q 83.Kc5 Kf1 >>>0:05 5/9 -13.17 520117 78...Kf1 79.Kc3 Ke1 80.Kc4 g2 81.Re8+ >>> Re2 82.Rd8 g1=Q 83.Rxd2 Kxd2 84.Kd5 >>>0:15 6/10 -13.30 1610302 78...Kf1 79.Kc3 Ke1 80.Kc4 g2 81.Re8+ >>> Re2 82.Rd8 g1=Q 83.Rd5 Qg4+ 84.Kc5 >>> Qc8+ 85.Kb5 d1=Q 86.Rxd1+ Kxd1 >>>0:46 7/11 -13.35 4752680 78...Kf1 79.Kc3 Ke1 80.Kc4 g2 81.Re8+ >>> Re2 82.Rd8 g1=Q 83.Rd5 Qg4+ 84.Kc5 >>> Qc8+ 85.Kb5 Qb7+ 86.Kc5 Qc7+ 87.Kb5 >>> d1=Q 88.Rxd1+ Kxd1 >>>3:06 8/12 -15.25 19391217 78...Kf1 79.Kc3 Ke1 80.Kc4 g2 81.Re8+ >>> Kf1 82.Rd8 g1=Q 83.Rd4 Qg8+ 84.Kc5 >>> Qg5+ 85.Kc4 Rf4 86.Kb3 Rxd4 >>>9:45 9/13 -Mate14 62576834 78...Kf1 79.Kc3 Ke1 80.Kc4 g2 81.Re8+ >>> Re2 82.Rd8 g1=Q 83.Rd6 Qg8+ 84.Kb4 >>> Qb8+ 85.Kc4 Qc7+ 86.Kb5 Re5+ 87.Kb4 >>> Qc5+ 88.Kb3 Re3+ 89.Rd3 Rxd3+ 90.Kb2 >>> Qc1+ 91.Ka2 Ra3# >>> >>>Note that the first capture is 23 ply away, making it very difficult >>>(impossible?) to find it via tablebases. Can anybody else find the mate faster? >> >>As always... YES... >> >>GambitTiger 2 aggr.: >> >>Neue Partie >>3R4/8/8/8/2K5/6p1/3p1rk1/8 b - - 0 1 >> >>Analysis by Gambit Tiger 2.0: >> >>1...d2-d1D 2.Td8-d2 Tf2xd2 3.Kc4-b5 Kg2-f2 4.Kb5-c4 Td2-c2+ 5.Kc4-b5 g3-g2 >> -+ (-30.12) Tiefe: 8 00:00:00 187kN, tb=35 >>1...d2-d1D >> -+ (-31.02) Tiefe: 9 00:00:00 261kN, tb=47 >>1...d2-d1D 2.Td8xd1 >> -+ (-#22) Tiefe: 9 00:00:00 283kN, tb=63 >>1...d2-d1D 2.Td8xd1 >> -+ (-#22) Tiefe: 10 00:00:02 883kN, tb=261 >>1...Tf2-f4+ 2.Kc4-c5 d2-d1D 3.Td8xd1 >> -+ (-#21) Tiefe: 10 00:00:04 1840kN, tb=425 >>1...Tf2-f4+ 2.Kc4-c5 Tf4-f5+ 3.Kc5-c6 d2-d1D 4.Td8xd1 >> -+ (-#20) Tiefe: 11 00:00:08 3238kN, tb=804 >>1...Tf2-f4+ 2.Kc4-c5 Tf4-f5+ 3.Kc5-c6 d2-d1D 4.Td8xd1 >> -+ (-#20) Tiefe: 12 00:00:19 6777kN, tb=2563 >>1...Kg2-f1 2.Td8-d4 g3-g2 3.Td4-d6 g2-g1D 4.Kc4-b5 Tf2-f6 5.Td6xf6+ >> -+ (-#12) Tiefe: 12 00:00:41 18148kN, tb=4317 >>1...Kg2-f1 2.Kc4-c3 g3-g2 3.Td8xd2 >> -+ (-#10) Tiefe: 13 00:02:25 75601kN, tb=9373 >> >>(Faber, Haltern 12.08.2002) >> >>>So, SPEAKING STRICTLY AESTHETICALLY, what do you think of EGTBs when used in >>>game play? >> >>No problem. >> >>>jm >> >> >>What do you say NOW? :-) > >I assume that you WERE using tablebases here? Yes. tb=9373 means the number of TB hits. >If so, then the point was that >CM9000 was NOT using tablebases to find the mate. Wasn't it you who complained about progs using the TBs would NOT play accurate and find the shortest mate? >Additionally, you should >remember to always add 1 to Tiger's mate declarations. So it is really a mate in >11 that Tiger found. > >jm However, but no d2-d1-Q.
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