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Subject: Re: A KRRPKR query ... thanks

Author: GuyHaworth

Date: 01:10:09 09/15/04

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Thanks to both Rob Hyatt and Tony Werten ...

[D] r7/8/5R2/2k5/8/3R1K2/6P1/8 w:

DEEP JUNIOR -v- DEEP FRITZ, the 'Deep' C-C match, Game 4, 25/04/2001:
Play continued
70. Rc6+ Kb5 71. Rc5+ Kb4 72. Rb5+ Kc4 73. Rd4+ Kc3 74. Rc5+ K*d4

Rob Hyatt (Nalimov DTM-minimaxing) line ... (! == DTM-optimal move)
70. Rf5+ Kb4 71. Rdd5 Re8 72. Rde5 Rb8 73. Ke3! Kc3 74. Rc5+ Kb4! 75. Rfd5
Rb6 76. Kd3 Rb7 77. Ra5 Rb6 78. g4! Rb7 79. g5! Kb3! 80. Rdb5+ Rxb5
81. Rxb5+! Ka4! 82. Rb8 Ka3 83. Kc4 Ka2! 84. Kc3! Ka1! 85. Kc2! Ka2
86. Ra8#

Trivially, White had a conversion-oriented force, slightly longer in DTM terms,
with:
73. Rb5+ Rxb5 74. Rxb5 Kxb5 and mate in 18

Tony Werten's alternative Xinix-suggested line of 2001:
70. g4 Kc4 71. Rc6 Kxd3 and mate in 121 plies


Incidentally, KRRPKQ still has the deepest known DTM of an EGT'd P-endgame with
wtm and btm positions at DTM = 253:  positions unknown.

g



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