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Subject: Re: Mate in 10 :-) and the aesthetics of EGTBs

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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