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Old January 17th 11, 09:18 PM posted to rec.games.chess.misc,rec.games.chess.computer
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Default Another Lopez Howler (was: Kavalek analysis howler ofAnand-Carlsen London game)

On Dec 27 2010, 9:23*am, raylopez99 wrote:
On Dec 27, 1:20*pm, Taylor Kingston
wrote:

On Dec 26, 6:12*pm, raylopez99 wrote:


On Dec 27, 1:08*am, raylopez99 wrote:


7k/6pn/p4p2/1q6/5R2/6QP/6PK/8 w - - 0 4


14...Qb5


RL


And if 15.Rh4, then 15...Kg8 =


* 14...Qb5 15.Rh4 Kg8 16.Qc7 =


16..Ng5. *If Qc4+, then QxQ and if RxQ then f5 is my move.


Analyzing this a bit further, I made an interesting new discovery.
The move Lopez played here, ...f6-f5, creates this position:

6k1/6p1/p7/5pn1/2R5/7P/6PK/8

Here I played 1.Rf4, which as I recall was then, along with 1.Ra4,
Rybka's #1 choice. But at that time I was running Rybka under Fritz.
Now, running it under ChessBase, it finds a stronger line that
immediately refutes ...f5:

1.Rc5! g6 (forced) 2.g4! and:

a) 2...fxg4?? obviously loses to 3.Rxg5+;
b) 2...a5?? obviously loses;
c) Any king move obviously allows 3.gxf5 gxf5 4.Rxf5+-;
d) 2...Ne6 3.Rc6 Kf7 4.gxf5 gxf5 5.Rxa6+-;
e) 2...Nf3+ 3.Kg3 Nd4 4.Rc4 Nb5 5.Rc6 fxg4 6.Rxg6+ Kf7 7.Rxg4+-;
f) 2...Ne4 3.Rc6 Kf7 4.gxf5 gxf5 5.Rxa6+-.

It may not be obvious that the last three lines are winning for
White, but they are. The Nalimov tablebase says White can force mate
in 26 moves or less in all variations.
Moral: run Rybka 3 UCI under ChessBase, not Fritz!
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