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Subject: Transposition into won endgame

Author: Kurt Utzinger

Date: 14:51:32 01/30/04

The position below is from a 90m+30s game between
Shredder8 and ChessTiger15 in which White easily
won with 45.Qf6 and an won pawn ending. Interesting
to see that many engines do not find the winning
move within reasonalbe time, i.e. Chess Tiger 15
whereas it's no problem for Chess Tiger 14.
Kurt

[D]8/4Q3/p5k1/1p2P3/5q2/P2K4/1P6/8 w - - 0 46


Shredder 8 - Chess Tiger 15.0
8/6k1/p3Q3/1p2P3/5q2/P2K4/1P6/8 w - - 0 1

Analysis by Chess Tiger 14.0:

45.Qd7+ Kg6 46.Qc6+ Kg5 47.e6 Qf1+ 48.Kd2 Qf4+ 49.Kc2 Qf5+ 50.Kc3
  +-  (1.52)   Depth: 7   00:00:00  179kN
45.Qd7+ Kg6 46.Qd6+ Kh5 47.b3 Qg3+ 48.Kd4 Qxb3 49.Qxa6 Qc4+ 50.Ke3
  ±  (1.40)   Depth: 7   00:00:00  297kN
45.Qd7+ Kg6 46.Qd6+ Kg5 47.Qd8+ Kh5 48.Qd5 Kg5 49.b3 Qf1+ 50.Kd2
  ±  (1.34)   Depth: 8   00:00:01  670kN
45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qxb2 49.Qd7+ Kf8 50.Qd6+ Ke8 51.Qxa6
  ±  (1.40)   Depth: 8   00:00:02  769kN
45.Qe7+ Kg6 46.b3 Qg3+ 47.Kd4 Qf4+ 48.Kc5 Qe3+ 49.Kd6 Qd3+ 50.Kc7 Qxb3 51.Qf6+
Kh5 52.Qxa6
  +-  (1.44)   Depth: 8   00:00:02  989kN
45.Qe7+ Kg6 46.b3 Qg3+ 47.Kd4 Qf4+ 48.Kc5 Qe3+ 49.Kd6 Qd3+ 50.Kc7 Qxb3 51.Qf6+
Kh5 52.Qxa6
  +-  (1.44)   Depth: 9   00:00:03  1316kN
45.Qe7+ Kg6 46.b3 Qg3+ 47.Kd4 Qxb3 48.Qf6+ Kh5 49.Qxa6 Qc4+ 50.Ke3 Qc3+ 51.Ke4
Qc4+ 52.Kf3 Qc3+ 53.Kf4
  ±  (1.38)   Depth: 10   00:00:07  2750kN
45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc4 51.Ka5
  +-  (1.42)   Depth: 10   00:00:08  3482kN
45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc4 51.Ka5
  +-  (1.42)   Depth: 11   00:00:10  4045kN, tb=3
45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc5 51.b4+
Kc4 52.Ka5
  +-  (1.44)   Depth: 12   00:00:16  6530kN, tb=21
45.Qf6+
  +-  (2.34)   Depth: 13   00:00:23  9597kN, tb=80
45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc5 51.b4+
Kc4 52.Ka5 Kb3 53.Kxb5 Kxa3
  +-  (7.20)   Depth: 13   00:00:23  9607kN, tb=128
45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc5 51.b4+
Kc4 52.Ka5 Kb3 53.Kxb5 Kxa3
  +-  (7.16)   Depth: 14   00:00:26  11049kN, tb=258
45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc5 51.b4+
Kc4 52.Ka5 Kb3 53.Kxb5 Kxa3
  +-  (7.16)   Depth: 15   00:00:31  13388kN, tb=608
45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc5 51.b4+
Kc4 52.Ka5 Kb3 53.Kxb5 Kxa3
  +-  (7.16)   Depth: 16   00:00:41  18574kN, tb=1399

(Utzinger, MyTown 30.01.2004)


Shredder 8 - Chess Tiger 15.0
8/6k1/p3Q3/1p2P3/5q2/P2K4/1P6/8 w - - 0 1

Analysis by Chess Tiger 15.0:

45.b3
  +-  (1.70)   Depth: 1   00:00:00
45.b3
  +-  (1.72)   Depth: 1   00:00:00
45.b3 Kh7
  +-  (1.78)   Depth: 2   00:00:00
45.b3 Qf1+ 46.Kc2 Qf2+ 47.Kd1
  +-  (1.44)   Depth: 3   00:00:00  2kN
45.Qe7+ Kg6 46.Qd6+ Kh5 47.b3
  +-  (1.52)   Depth: 3   00:00:00  3kN
45.Qd7+ Kg6 46.Qc6+ Kf7 47.e6+ Kf6 48.Qxa6
  +-  (1.62)   Depth: 3   00:00:00  5kN
45.Qd7+ Kg6 46.Qc6+ Kg5 47.e6 Kf6 48.Qxa6
  +-  (1.62)   Depth: 4   00:00:00  11kN
45.Qd7+ Kg6 46.Qc6+ Kg5 47.Qe4 Qh2 48.b4
  +-  (1.54)   Depth: 5   00:00:00  28kN
45.Qd7+ Kg6 46.Qc6+ Kg5 47.e6 Qg3+ 48.Kc2 Qf2+ 49.Kc3 Qe2
  +-  (1.60)   Depth: 6   00:00:00  82kN
45.Qd7+ Kg6 46.Qd6+ Kh5 47.Qd5 Qg3+ 48.Kc2 Qf2+ 49.Kb3 Qf5 50.Kc3
  ±  (1.30)   Depth: 7   00:00:00  317kN
45.Qd7+ Kg6 46.Qd6+ Kh5 47.Qd5 Qg3+ 48.Kc2 Qf2+ 49.Kb3 Qe2 50.Qf7+ Kg5 51.Qf6+
Kh5
  ±  (1.30)   Depth: 8   00:00:02  889kN
45.Qe7+ Kg6 46.b3 Qg3+ 47.Kd4 Qxb3 48.Qf6+
  ±  (1.40)   Depth: 8   00:00:03  1253kN
45.Qe7+ Kg6 46.Qd6+ Kg5 47.Qd8+ Kh5 48.Qd4 Qf1+
  ±  (1.34)   Depth: 9   00:00:05  1996kN
45.Qe7+ Kg6 46.Qd6+ Kg5 47.Qd8+ Kh5 48.Qd4 Qf1+ 49.Kd2 Qf5 50.Qe3 Qe6 51.b3 Kg6
  ±  (1.36)   Depth: 10   00:00:09  3754kN
45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qc6+ 49.Kf4 Qh6+ 50.Kg4 Qh2 51.Qd7+
Kf8 52.Qd8+ Kf7 53.Qf6+ Ke8
  ±  (1.38)   Depth: 10   00:00:13  5280kN
45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qc6+ 49.Kf4 Qc1+ 50.Qe3 Qxb2 51.Qa7+
Kf8 52.Qxa6 Qf2+
  ±  (1.40)   Depth: 11   00:00:23  9571kN, tb=1
45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qc6+ 49.Kf4 Qh6+ 50.Kg4 Qe6+ 51.Qf5
Qc4+ 52.Kh5 Qc6 53.b4
  ±  (1.38)   Depth: 12   00:00:32  13409kN, tb=2
45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qxb2 49.Qd7+ Kf8 50.Qd6+ Ke8 51.Qe6+
Kd8 52.Qb6+ Kd7 53.Qa7+ Kd8
  ±  (1.30)   Depth: 13   00:01:22  35014kN, tb=18
45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qxb2 49.Qd7+ Kh6 50.Qe6+ Kg5 51.Qf6+
Kg4 52.Qf3+ Kg5 53.Qg3+ Kh5
  ±  (1.22)   Depth: 14   00:08:27  223480kN, tb=629
45.Qe7+ Kg6 46.Qd6+ Kg5 47.Qd8+ Kh5 48.Qd4 Qf3+ 49.Kd2 Qb3 50.Ke2 Qe6 51.Kd3
  ±  (1.38)   Depth: 14   00:12:10  321461kN, tb=707

(Utzinger, MyTown 30.01.2004)

Re: Transposition into won endgame Mike S. 02:21:06 01/31/04
- Re: Transposition into won endgame Kurt Utzinger 02:42:09 01/31/04
  - Re: Transposition into won endgame Christophe Theron 23:48:07 01/31/04
  - Re: Transposition into won endgame Thomas Mayer 04:10:55 01/31/04
    - Re: Transposition into won endgame Kurt Utzinger 06:32:35 01/31/04
Re: Transposition into won endgame Christophe Theron 16:02:39 01/30/04
- Re: Transposition into won endgame Kurt Utzinger 00:19:28 01/31/04
Re: Transposition into won endgame Ed Trice 15:35:50 01/30/04
- Re: Transposition into won endgame Christophe Theron 16:05:04 01/30/04
- Re: Transposition into won endgame Dieter Buerssner 15:52:48 01/30/04

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