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Subject: Re: Mercilous Attack? What is it? What is the ECO on it?

Author: Andrew Dados

Date: 13:16:28 07/07/99

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On July 07, 1999 at 15:44:04, Dann Corbit wrote:

>What exactly is the Mercilous Attack?
>What is the ECO classification for the Mercilous Attack?
>Why do computers have a hard time with it?
>What are the principal variations?

 Mercilous attack got it's name from 'mercilous' handle on icc. That guy played
zillions games against crafty (do 'search mercilous crafty' there...) to master
a long - forced mate sequence against sacced N on g4 (as black) or on g5 as
white. In general programs which don't do checks in q-search (crafty for one)
can fall into that trap on fast tc and slower hardware. Some example games
below.
 -Andrew-

[Event "ICC 1 0 u"]
[Site "Internet Chess Club"]
[Date "1998.10.12"]
[Round "-"]
[White "Nudnick"]
[Black "CrazyBishop"]
[Result "1-0"]
[WhiteElo "2026"]
[BlackElo "2542"]
[Opening "Benko's opening"]
[ECO "A00"]
[NIC "VO.09"]
[Time "23:11:58"]
[TimeControl "60+0"]

1. g3 e5 2. Na3 Bxa3 3. bxa3 c5 4. h4 d5 5. d3 Qa5+ 6. Bd2 Qxa3 7. Bh3 Bxh3 8.
Nxh3 Nf6 9. e3 h5 10. Ng5 b5 11. Kf1 a5 12. Kg2 O-O 13. Qe2 Qa4 14. Rac1 Qxa2
15. f4 Ng4 16. f5 Nc6 17. Rcf1 b4 18. f6 Nxf6 19. Rxf6 gxf6 20. Qxh5 fxg5 21.
hxg5 Qb3 22. Qh8# {Black checkmated} 1-0

[Event "ICC 3 0"]
[Site "Internet Chess Club"]
[Date "1998.01.17"]
[Round "-"]
[White "crafty"]
[Black "mercilous"]
[Result "0-1"]
[WhiteElo "2844"]
[BlackElo "2557"]
[Opening "R\\'eti opening"]
[ECO "A04"]
[NIC "QP.11"]
[Time "02:20:49"]
[TimeControl "180+0"]

1. Nf3 h6 2. e4 e6 3. d4 d6 4. Bd3 g6 5. O-O h5 6. c3 Bh6 7. Qa4+ Kf8 8. Bxh6+
Nxh6 9. h3 Na6 10. Bxa6 bxa6 11. Nbd2 Ng4 12. d5 e5 13. Qc6 Bd7 14. Qxa6 Qe7 15.
Qb7 Qd8 16. Rab1 Rh6 17. Ne1 Rh8 18. hxg4 hxg4 19. Nef3 Rh6 20. Nxe5 Qh4 21.
Nxg6+ fxg6 22. Qxa8+ Be8 23. f4 g3 24. Qxe8+ Kxe8 25. c4 Qh1# {White checkmated}
0-1

[Event "ICC 5 0"]
[Site "Internet Chess Club"]
[Date "1997.11.19"]
[Round "-"]
[White "crafty"]
[Black "mercilous"]
[Result "0-1"]
[WhiteElo "2797"]
[BlackElo "2463"]
[Opening "Queen's pawn"]
[ECO "A40"]
[NIC "QO.17"]
[Time "16:37:32"]
[TimeControl "300+0"]

1. d4 h6 2. e4 e6 3. Bd3 d6 4. Nf3 g6 5. O-O Bd7 6. c3 Na6 7. Bxa6 bxa6 8. Qd3
h5 9. Qxa6 Bh6 10. Na3 Kf8 11. e5 d5 12. Bxh6+ Nxh6 13. h3 Ng4 14. Nd2 Rb8 15.
Nb3 Ra8 16. hxg4 hxg4 17. Qb7 Qh4 18. Qxa8+ Be8 19. f3 g3 20. Qxe8+ Kxe8 21. Nc5
Qh1# {White checkmated} 0-1





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