Friday, June 12, 2009

Rybka deals with the Jerome Gambit


The following is taken from the Support and Discussion section of the Rybka website.

It seems that the Jerome Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+) can have a discombobulating effect on even the best chess-playing program in the world.

Topic Rybka Support & Discussion / Rybka / Rybka 2.3.2a mp, bug after Y-key? (493 hits)

By Michiel Wind Date 2008-06-11 04:58 Edited 2008-06-11 05:45

Not sure if anybody mentioned this bug before.

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+
(the Jerome Gambit, my secret weapon for the next Freestyle tournament) Kxf7 5.Nxe5+

Now the obvious reply is Nxe5, but I wanted to know if there are any alternatives, so I pressed the Y-key. Rybka now gives 5....Ke8 as +0.3.

But strangely enough, if I play 5...Kf8 he immediately gives it as -0.8!

If after 5.Nxe5 I ask for 3 variations, then they are correctly listed as 5...Nxe5 -1.45...Kf8 -0.85...Ke8 +0.3

I have tried the above many times, but Rybka always gives the wrong alternative (to 5...Nxe5) move 5...Ke8 instead of 5...Kf8.

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