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.
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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