I think that you need time to decompile rybka so what you suggest is not possible for an author who has not time.

I do not believe in cospiracy theories but
If you suggest conspiracy theory then why not suggest that the real author of zappa is not anthony but his girlfriend who is not busy in anthony's phd and has a lot of time to work on zappa.

Uri

"I suspect without evidence......"
Phew!

This is nonsense since Zappa existed and was very strong before Rybka existed in the public....
Also i don't like the opinion that: "Oh that engine is close to strength to Rybka, so it HAS to be a clone/derivative of Rybka."
Other people are clever too so can create strong engines too....

Also Zap!Chess is not very close in rating with Rybka although it depends on what you mean with "very close"....

Latest 120/40 rating list by CEGT gives newest public Rybka a +115 ELO more than Zap!Chess Zanzibar. I don't think it has any meaning to call this very close.

  1 Rybka 2.3.2a 64 2CPU                : 3045   21  21   750    77.5 %  
  2 Rybka 2.3 64 2CPU                     : 2996   20  20   750    72.1 %  
  3 Rybka 2.1c 64 2CPU                    : 2994   21  21   750    71.9 % 
  4 Rybka 1.2f 64-bit                         : 2959   18  18   950    70.3 % 
  5 Zap!Chess Zanzibar 64 2CPU     : 2930   17  17   900    62.6 % 
  6 Deep Fritz 10 2CPU                     : 2884   17  17   950    56.3 % 

I can tell you with 100% certainty that Anthony didn't do this.

Vas