Author: Harald Faber
Date: 03:49:12 08/11/02
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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? :-)
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