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Subject: 8 WAC toughies at long time control

Author: Dann Corbit

Date: 14:42:54 03/15/01

[D]4k3/p4prp/1p6/2b5/8/2Q3P1/P2R1PKP/4q3 w - - acd 18; acn -1987086287; acs
86400; bm Rd8+; ce 100; id "WAC.038"; pv Rd8+ Kxd8 Qxe1 f6 Qc3 Ke7 Qf3 Rf7 Qf5
Kf8 a4 Kg7 Qg4+ Kh6 a5 Re7 Qf5 Kg7;
[D]8/p3k1p1/4r3/2ppNpp1/PP1P4/2P3KP/5P2/8 b - - acd 19; acn 865574524; acs
86401; bm Rxe5; ce 774; id "WAC.087"; pv Rxe5 dxe5 d4 Kf3 dxc3 Ke3 cxb4 Kd3 Ke6
Kc2 Kxe5 Kd3 a5 Kc2 Kd4 Kb3 Kd3 f3 c2 Kb2;
[D]r4rk1/1p2ppbp/p2pbnp1/q7/3BPPP1/2N2B2/PPP4P/R2Q1RK1 b - - acd 19; acn
-231595281; acs 86400; bm Bxg4; ce 88; id "WAC.092"; pv Bxg4 Bxg4 Nxg4 Bxg7 Qh5
Qe2 Kxg7 Kh1 Qh4 Rad1 b5 Rd3 f5 Rg3 h5 Kg1 fxe4 Nxe4 b4;
[D]8/k1b5/P4p2/1Pp2p1p/K1P2P1P/8/3B4/8 w - - acd 20; acn -543127173; acs 86401;
bm b6+; ce 501; id "WAC.100"; pv b6+ Bxb6 Kb5 Bc7 Be3 Ka8 Kxc5 Ka7 Kc6+ Ka8 Kd7
Ba5 Ke6 Kb8 Kxf6 Bd8+ Kxf5 Bxh4 Ke6 Bg3 a7+ Ka8 f5;
[D]4r1k1/p1qr1p2/2pb1Bp1/1p5p/3P1n1R/1B3P2/PP3PK1/2Q4R w - - acd 11; acn
125715014; acs 534; bm Qxf4; ce 32756; id "WAC.141"; pv Qxf4 Bxf4 Rxh5 gxh5 Rxh5
Bh6 Rxh6 Qh2+ Kxh2 Kf8 Rh8#;

This one is (of course) the real toughie:
[D]2b5/1r6/2kBp1p1/p2pP1P1/2pP4/1pP3K1/1R3P2/8 b - - acd 24; acn -1238874665;
acs 86401; bm Rb4; ce 279; id "WAC.230"; pv Rh7 Rb1 a4 Ba3 Rh5 f4 Kd7 Kg2 Rh4
Rf1 Kc6 Kg3 Rh7 Kg2 Rg7 Rb1 Bb7 Rb2 Rg8 Kg3 Kd7 Kf3 Rh8 Ke3;

[D]3r1rk1/1pb1qp1p/2p3p1/p7/P2Np2R/1P5P/1BP2PP1/3Q1BK1 w - - acd 18; acn
-2054549703; acs 86400; bm Nf5; ce 555; id "WAC.256"; pv Nf5 Qg5 Qc1 e3 Nh6+
Qxh6 Rxh6 Bf4 Rxg6+ hxg6 fxe3 Bg5 Qe1 Rfe8 e4 Bf4 Qh4 Be3+;
[D]5r1k/3b2p1/p6p/1pRpR3/1P1P2q1/P4pP1/5QnP/1B4K1 w - - acd 18; acn 1605871043;
acs 86400; bm h3; ce 433; id "WAC.291"; pv h3 Qxh3 Qxf3 Nf4 Qxf4 Kg8 Bh7+ Kxh7
Qxf8 Qxg3+ Kf1 Bh3+ Ke2 Bg4+ Kd2 Qg2+ Ke1 Qg1+ Qf1 Qxd4 Rcxd5 Qc3+ Kf2 Qf3+ Kg1
Qxa3 Qb1+ Kg8 Re7;

I have an idea how to break WAC 230 with chess engines.  Have an algorithm that
detects wall formation (impenetrable formation of any type).  Then, give a
centipawn evaluation of zero until the wall is breached.

Has anyone tried this?  It seems it could be done simply enough.  You would only
have to go a few plies forward with this wall detection thingy for it to be
effective.

Re: WAC 230 - Rb4 found by Fritz 6 (<20 min.) Mark Young 23:49:30 03/15/01
- Re: WAC 230 - Rb4 found by Fritz 6 (<20 min.) Robert Hyatt 06:02:09 03/16/01
  - Re: WAC 230 - Rb4 found by Fritz 6 (<20 min.) Dann Corbit 10:53:33 03/16/01
    - Re: WAC 230 - Rb4 found by Fritz 6 (<20 min.) Robert Hyatt 12:18:28 03/16/01
- Re: WAC 230 - Rb4 found by Fritz 6 (<20 min.) jonas cohonas 00:33:31 03/16/01
  - Re: WAC 230 - Rb4 found by Fritz 6 (<20 min.) Vincent Lejeune 00:39:16 03/16/01
mododified Crafty finds the solution Jarkko Pesonen 23:41:44 03/15/01
Re: 8 WAC toughies at long time control - WAC 230 Thomas Mayer 15:52:16 03/15/01
- Re: 8 WAC toughies at long time control - WAC 230 Dann Corbit 16:00:31 03/15/01
  - Re: 8 WAC toughies at long time control - WAC 230 Carlos del Cacho 22:41:43 03/15/01
    - Re: 8 WAC toughies at long time control - WAC 230 Robert Hyatt 06:47:09 03/16/01
      - Re: 8 WAC toughies at long time control - WAC 230 Dann Corbit 10:51:43 03/16/01
        
        Re: 8 WAC toughies at long time control - WAC 230 Robert Hyatt 12:21:18 03/16/01

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